Wiseco Piston

• Wiseco's high-tech manufacturing ensures greater operating strength and lower expansion at high temperatures
• Kits include forged pistons with ArmorGlide coated skirts, rings, retainer clips, chrome piston pins and top-end gasket kits
• Twin Cam pistons have ArmorPlating which improves ring seal, eliminates ring micro-welding, and improves the piston's ability to defend against detonation damage
• Piston kits are available with X-Ring package (.062 top ring, .062 compression ring and .158 oil ring), XC-Ring packages (.039 top ring, .062 compression ring, .158 oil ring) or VM-rings (1.2mm steel, positive twist, gas nitrided top ring, 1.2mm cast iron, taper under-hook scraper ring and 2.0mm three-piece, flex-vent oil ring with steel chrome-faced rails); VM-rings, X-Rings and XC-Rings will not interchange
• X- and XC-rings are identified by PART # in the application chart; X-Ring PART #s end with an "X" and XC-Ring PART #s end with an "XC"
• 103" kits require cylinder boring; 110" kit requires big-bore cylinders and case boring; X-Ring package (.0472" top ring, .0472" compression ring and .118" oil ring); recalibration required
• Pistons are made in the U.S.A.

• Wiseco wrist pins are strong, lightweight and can be used with OEM pistons, too
• Wiseco 2-stroke pistons include a wrist pin unless indicated
• See price list on page ???

• Two high-strength, easy-to-install circlips furnished with every piston
• Order additional inventory from the chart on page ???
• See price list on page ???

• Most Wiseco 2-cycle pistons are forged from high-silicone bar stock
• Greater strength and lower expansion at high temperatures
• Complete piston kits include High-Performance forged pistons, rings, wrist pins, circlips and top-end gasket kit for one complete engine
• All Wiseco High-Performance pistons are priced with rings, wrist pins and circlips
• Wiseco ring types are not interchangeable (i.e., CD is not interchangeable with LC) and fit only Wiseco pistons

WARNING: Wiseco pistons can be fitted only with Wiseco rings.

• Forged from a high-silicone aluminum alloy to deliver long life and consistent dimensions
• Wiseco's high-tech manufacturing ensures greater operating strength and lower expansion at high temperatures
• Sold in kits that include two pistons, rings, piston pins and circlips
• Include forged pistons with coated skirts, rings, retainer clips and chrome piston pins
• Piston kits are available with Hastings-style X-Ring package (.62 top ring, .62 compression ring and .158 oil ring)

• Most Wiseco 2-cycle pistons are forged from high-silicone bar stock
• Greater strength and lower expansion at high temperatures
• Complete piston kits include High-Performance forged pistons, rings, wrist pins, circlips and top-end gasket kit for one complete engine
• All Wiseco High-Performance pistons are priced with rings, wrist pins and circlips
• Wiseco ring types are not interchangeable (i.e., CD is not interchangeable with LC) and fit only Wiseco pistons

WARNING: Wiseco pistons can be fitted only with Wiseco rings.

• Forged from high-silicon aluminum alloy for maximum strength and dependability
• Wiseco offers a complete range of popular piston models and years for both trail and racing applications

WISECO FEATURES PRO-LITE PISTONS

• Innovative forging design and piston skirt provide maximum horsepower and torque
• Durability, longevity and increased horsepower

PK PISTON AND GASKET KITS

• Feature forged pistons, rings, wrist pins, circlips and top end gasket set
• Contain all the necessary components for overboring or rebuilding your top end
• Cylinder sleeves must be purchased separately
• See price list on page ???

WISECO PISTON PRICING

• All Wiseco High-Performance Motorcycle Pistons are priced with rings and circlips; see price list on page ???

4-STROKE RACER'S CHOICE PISTONS

• When blow-by starts to increase on other pistons and power starts to fade, Wiseco Race Series parts continue sealing and performing
• Now you can own the same race parts as all the top race teams
• These high-tech piston designs offer maximum compression ratios, ultra-stiff strutted forgings, and titanium nitride-coated rings, which all add up to more power that is sustained longer

2-STROKE GP SERIES PISTONS

• Have additional features over standard Pro-Lite parts
• Each piston is E-Coated on the crown, ring grooves, and pin bore, for maximum wear resistance and protection from micro-welding, galling, and detonation
• Additionally, boost ports are removed for a more predictable powerband and increased pull on the top end
• GP Series parts generally have less machining on the outside, which helps seal up the bore for increased compression

NOTE: Service intervals may be increased with Racer's Choice pistons over conventional Wiseco pistons, and are for expert racers and tuners only.

• Forged from high-silicon aluminum alloy for maximum strength and dependability
• Wiseco offers a complete range of popular piston models and years for both trail and racing applications

WISECO FEATURES PRO-LITE PISTONS

• Innovative forging design and piston skirt provide maximum horsepower and torque
• Durability, longevity and increased horsepower

PK PISTON AND GASKET KITS

• Feature forged pistons, rings, wrist pins, circlips and top end gasket set
• Contain all the necessary components for overboring or rebuilding your top end
• Cylinder sleeves must be purchased separately
• See price list on page ???

WISECO PISTON PRICING

• All Wiseco High-Performance Motorcycle Pistons are priced with rings and circlips; see price list on page ???

4-STROKE RACER'S CHOICE PISTONS

• When blow-by starts to increase on other pistons and power starts to fade, Wiseco Race Series parts continue sealing and performing
• Now you can own the same race parts as all the top race teams
• These high-tech piston designs offer maximum compression ratios, ultra-stiff strutted forgings, and titanium nitride-coated rings, which all add up to more power that is sustained longer

2-STROKE GP SERIES PISTONS

• Have additional features over standard Pro-Lite parts
• Each piston is E-Coated on the crown, ring grooves, and pin bore, for maximum wear resistance and protection from micro-welding, galling, and detonation
• Additionally, boost ports are removed for a more predictable powerband and increased pull on the top end
• GP Series parts generally have less machining on the outside, which helps seal up the bore for increased compression

NOTE: Service intervals may be increased with Racer's Choice pistons over conventional Wiseco pistons, and are for expert racers and tuners only.

• Forged from high-silicon aluminum alloy for maximum strength and dependability
• Wiseco offers a complete range of popular piston models and years for both trail and racing applications

WISECO FEATURES PRO-LITE PISTONS

• Innovative forging design and piston skirt provide maximum horsepower and torque
• Durability, longevity and increased horsepower

PK PISTON AND GASKET KITS

• Feature forged pistons, rings, wrist pins, circlips and top end gasket set
• Contain all the necessary components for overboring or rebuilding your top end
• Cylinder sleeves must be purchased separately
• See price list on page ???

WISECO PISTON PRICING

• All Wiseco High-Performance Motorcycle Pistons are priced with rings and circlips; see price list on page ???

4-STROKE RACER'S CHOICE PISTONS

• When blow-by starts to increase on other pistons and power starts to fade, Wiseco Race Series parts continue sealing and performing
• Now you can own the same race parts as all the top race teams
• These high-tech piston designs offer maximum compression ratios, ultra-stiff strutted forgings, and titanium nitride-coated rings, which all add up to more power that is sustained longer

2-STROKE GP SERIES PISTONS

• Have additional features over standard Pro-Lite parts
• Each piston is E-Coated on the crown, ring grooves, and pin bore, for maximum wear resistance and protection from micro-welding, galling, and detonation
• Additionally, boost ports are removed for a more predictable powerband and increased pull on the top end
• GP Series parts generally have less machining on the outside, which helps seal up the bore for increased compression

NOTE: Service intervals may be increased with Racer's Choice pistons over conventional Wiseco pistons, and are for expert racers and tuners only.

• All Wiseco pistons are forged from aerospace aluminum alloys on Wiseco's state-of-the-art forging presses
• Built on a legacy of championships for over 60 years by American craftsmen
• Wiseco pistons have the latest dyno-tested technology to out-perform the competition
• Wiseco forged pistons are priced with rings and circlips
• Wiseco rings, clips and wrist pins only fit Wiseco pistons; also note that ring types do not interchange (i.e. CD is not interchangeable with TD)
• See replacement rings, wrist pins, and circlip pricing on page??????

WARNING: Wiseco pistons can be fitted only with Wiseco rings.

• Forged from high-silicon aluminum alloy for maximum strength and dependability
• Wiseco offers a complete range of popular piston models and years for both trail and racing applications

WISECO FEATURES PRO-LITE PISTONS

• Innovative forging design and piston skirt provide maximum horsepower and torque
• Durability, longevity and increased horsepower

PK PISTON AND GASKET KITS

• Feature forged pistons, rings, wrist pins, circlips and top end gasket set
• Contain all the necessary components for overboring or rebuilding your top end
• Cylinder sleeves must be purchased separately
• See price list on page ???

WISECO PISTON PRICING

• All Wiseco High-Performance Motorcycle Pistons are priced with rings and circlips; see price list on page ???

4-STROKE RACER'S CHOICE PISTONS

• When blow-by starts to increase on other pistons and power starts to fade, Wiseco Race Series parts continue sealing and performing
• Now you can own the same race parts as all the top race teams
• These high-tech piston designs offer maximum compression ratios, ultra-stiff strutted forgings, and titanium nitride-coated rings, which all add up to more power that is sustained longer

2-STROKE GP SERIES PISTONS

• Have additional features over standard Pro-Lite parts
• Each piston is E-Coated on the crown, ring grooves, and pin bore, for maximum wear resistance and protection from micro-welding, galling, and detonation
• Additionally, boost ports are removed for a more predictable powerband and increased pull on the top end
• GP Series parts generally have less machining on the outside, which helps seal up the bore for increased compression

NOTE: Service intervals may be increased with Racer's Choice pistons over conventional Wiseco pistons, and are for expert racers and tuners only.

• Forged from high-silicon aluminum alloy for maximum strength and dependability
• Wiseco offers a complete range of popular piston models and years for both trail and racing applications

WISECO FEATURES PRO-LITE PISTONS

• Innovative forging design and piston skirt provide maximum horsepower and torque
• Durability, longevity and increased horsepower

PK PISTON AND GASKET KITS

• Feature forged pistons, rings, wrist pins, circlips and top end gasket set
• Contain all the necessary components for overboring or rebuilding your top end
• Cylinder sleeves must be purchased separately
• See price list on page ???

WISECO PISTON PRICING

• All Wiseco High-Performance Motorcycle Pistons are priced with rings and circlips; see price list on page ???

4-STROKE RACER'S CHOICE PISTONS

• When blow-by starts to increase on other pistons and power starts to fade, Wiseco Race Series parts continue sealing and performing
• Now you can own the same race parts as all the top race teams
• These high-tech piston designs offer maximum compression ratios, ultra-stiff strutted forgings, and titanium nitride-coated rings, which all add up to more power that is sustained longer

2-STROKE GP SERIES PISTONS

• Have additional features over standard Pro-Lite parts
• Each piston is E-Coated on the crown, ring grooves, and pin bore, for maximum wear resistance and protection from micro-welding, galling, and detonation
• Additionally, boost ports are removed for a more predictable powerband and increased pull on the top end
• GP Series parts generally have less machining on the outside, which helps seal up the bore for increased compression

NOTE: Service intervals may be increased with Racer's Choice pistons over conventional Wiseco pistons, and are for expert racers and tuners only.

• Forged from high-silicon aluminum alloy for maximum strength and dependability
• Wiseco offers a complete range of popular piston models and years for both trail and racing applications

WISECO FEATURES PRO-LITE PISTONS

• Innovative forging design and piston skirt provide maximum horsepower and torque
• Durability, longevity and increased horsepower

PK PISTON AND GASKET KITS

• Feature forged pistons, rings, wrist pins, circlips and top end gasket set
• Contain all the necessary components for overboring or rebuilding your top end
• Cylinder sleeves must be purchased separately
• See price list on page ???

WISECO PISTON PRICING

• All Wiseco High-Performance Motorcycle Pistons are priced with rings and circlips; see price list on page ???

4-STROKE RACER'S CHOICE PISTONS

• When blow-by starts to increase on other pistons and power starts to fade, Wiseco Race Series parts continue sealing and performing
• Now you can own the same race parts as all the top race teams
• These high-tech piston designs offer maximum compression ratios, ultra-stiff strutted forgings, and titanium nitride-coated rings, which all add up to more power that is sustained longer

2-STROKE GP SERIES PISTONS

• Have additional features over standard Pro-Lite parts
• Each piston is E-Coated on the crown, ring grooves, and pin bore, for maximum wear resistance and protection from micro-welding, galling, and detonation
• Additionally, boost ports are removed for a more predictable powerband and increased pull on the top end
• GP Series parts generally have less machining on the outside, which helps seal up the bore for increased compression

NOTE: Service intervals may be increased with Racer's Choice pistons over conventional Wiseco pistons, and are for expert racers and tuners only.

• Forged from high-silicon aluminum alloy for maximum strength and dependability
• Wiseco offers a complete range of popular piston models and years for both trail and racing applications

WISECO FEATURES PRO-LITE PISTONS

• Innovative forging design and piston skirt provide maximum horsepower and torque
• Durability, longevity and increased horsepower

PK PISTON AND GASKET KITS

• Feature forged pistons, rings, wrist pins, circlips and top end gasket set
• Contain all the necessary components for overboring or rebuilding your top end
• Cylinder sleeves must be purchased separately
• See price list on page ???

WISECO PISTON PRICING

• All Wiseco High-Performance Motorcycle Pistons are priced with rings and circlips; see price list on page ???

4-STROKE RACER'S CHOICE PISTONS

• When blow-by starts to increase on other pistons and power starts to fade, Wiseco Race Series parts continue sealing and performing
• Now you can own the same race parts as all the top race teams
• These high-tech piston designs offer maximum compression ratios, ultra-stiff strutted forgings, and titanium nitride-coated rings, which all add up to more power that is sustained longer

2-STROKE GP SERIES PISTONS

• Have additional features over standard Pro-Lite parts
• Each piston is E-Coated on the crown, ring grooves, and pin bore, for maximum wear resistance and protection from micro-welding, galling, and detonation
• Additionally, boost ports are removed for a more predictable powerband and increased pull on the top end
• GP Series parts generally have less machining on the outside, which helps seal up the bore for increased compression

NOTE: Service intervals may be increased with Racer's Choice pistons over conventional Wiseco pistons, and are for expert racers and tuners only.

• All Wiseco pistons are forged from aerospace aluminum alloys on Wiseco's state-of-the-art forging presses
• Built on a legacy of championships for over 60 years by American craftsmen
• Wiseco pistons have the latest dyno-tested technology to out-perform the competition
• Wiseco forged pistons are priced with rings and circlips
• Wiseco rings, clips and wrist pins only fit Wiseco pistons; also note that ring types do not interchange (i.e. CD is not interchangeable with TD)
• See replacement rings, wrist pins, and circlip pricing on page??????

WARNING: Wiseco pistons can be fitted only with Wiseco rings.

• All Wiseco pistons are forged from aerospace aluminum alloys on Wiseco's state-of-the-art forging presses
• Built on a legacy of championships for over 60 years by American craftsmen
• Wiseco pistons have the latest dyno-tested technology to out-perform the competition
• Wiseco forged pistons are priced with rings and circlips
• Wiseco rings, clips and wrist pins only fit Wiseco pistons; also note that ring types do not interchange (i.e. CD is not interchangeable with TD)
• See replacement rings, wrist pins, and circlip pricing on page??????

WARNING: Wiseco pistons can be fitted only with Wiseco rings.

• Each ring set is for one piston
• See Wiseco ring buyer's guide for details
• See price list on page ???

NOTE: Wiseco rings fit only Wiseco pistons.

• Most Wiseco 2-cycle pistons are forged from high-silicone bar stock
• Greater strength and lower expansion at high temperatures
• Complete piston kits include High-Performance forged pistons, rings, wrist pins, circlips and top-end gasket kit for one complete engine
• All Wiseco High-Performance pistons are priced with rings, wrist pins and circlips
• Wiseco ring types are not interchangeable (i.e., CD is not interchangeable with LC) and fit only Wiseco pistons

WARNING: Wiseco pistons can be fitted only with Wiseco rings.

• Most Wiseco 2-cycle pistons are forged from high-silicone bar stock
• Greater strength and lower expansion at high temperatures
• Complete piston kits include High-Performance forged pistons, rings, wrist pins, circlips and top-end gasket kit for one complete engine
• All Wiseco High-Performance pistons are priced with rings, wrist pins and circlips
• Wiseco ring types are not interchangeable (i.e., CD is not interchangeable with LC) and fit only Wiseco pistons

WARNING: Wiseco pistons can be fitted only with Wiseco rings.

• Most Wiseco 2-cycle pistons are forged from high-silicone bar stock
• Greater strength and lower expansion at high temperatures
• Complete piston kits include High-Performance forged pistons, rings, wrist pins, circlips and top-end gasket kit for one complete engine
• All Wiseco High-Performance pistons are priced with rings, wrist pins and circlips
• Wiseco ring types are not interchangeable (i.e., CD is not interchangeable with LC) and fit only Wiseco pistons

WARNING: Wiseco pistons can be fitted only with Wiseco rings.

• Most Wiseco 2-cycle pistons are forged from high-silicone bar stock
• Greater strength and lower expansion at high temperatures
• Complete piston kits include High-Performance forged pistons, rings, wrist pins, circlips and top-end gasket kit for one complete engine
• All Wiseco High-Performance pistons are priced with rings, wrist pins and circlips
• Wiseco ring types are not interchangeable (i.e., CD is not interchangeable with LC) and fit only Wiseco pistons

WARNING: Wiseco pistons can be fitted only with Wiseco rings.

• Each ring set is for one piston
• See Wiseco ring buyer's guide for details
• See price list on page ???

NOTE: Wiseco rings fit only Wiseco pistons.

• Most Wiseco 2-cycle pistons are forged from high-silicone bar stock
• Greater strength and lower expansion at high temperatures
• Complete piston kits include High-Performance forged pistons, rings, wrist pins, circlips and top-end gasket kit for one complete engine
• All Wiseco High-Performance pistons are priced with rings, wrist pins and circlips
• Wiseco ring types are not interchangeable (i.e., CD is not interchangeable with LC) and fit only Wiseco pistons

WARNING: Wiseco pistons can be fitted only with Wiseco rings.

• Most Wiseco 2-cycle pistons are forged from high-silicone bar stock
• Greater strength and lower expansion at high temperatures
• Complete piston kits include High-Performance forged pistons, rings, wrist pins, circlips and top-end gasket kit for one complete engine
• All Wiseco High-Performance pistons are priced with rings, wrist pins and circlips
• Wiseco ring types are not interchangeable (i.e., CD is not interchangeable with LC) and fit only Wiseco pistons

WARNING: Wiseco pistons can be fitted only with Wiseco rings.

• Each ring set is for one piston
• See Wiseco ring buyer's guide for details
• See price list on page ???

NOTE: Wiseco rings fit only Wiseco pistons.

• Each ring set is for one piston
• See Wiseco ring buyer's guide for details
• See price list on page ???

NOTE: Wiseco rings fit only Wiseco pistons.

• Forged from high-silicon aluminum alloy for maximum strength and dependability
• Wiseco offers a complete range of popular piston models and years for both trail and racing applications

WISECO FEATURES PRO-LITE PISTONS

• Innovative forging design and piston skirt provide maximum horsepower and torque
• Durability, longevity and increased horsepower

PK PISTON AND GASKET KITS

• Feature forged pistons, rings, wrist pins, circlips and top end gasket set
• Contain all the necessary components for overboring or rebuilding your top end
• Cylinder sleeves must be purchased separately
• See price list on page ???

WISECO PISTON PRICING

• All Wiseco High-Performance Motorcycle Pistons are priced with rings and circlips; see price list on page ???

4-STROKE RACER'S CHOICE PISTONS

• When blow-by starts to increase on other pistons and power starts to fade, Wiseco Race Series parts continue sealing and performing
• Now you can own the same race parts as all the top race teams
• These high-tech piston designs offer maximum compression ratios, ultra-stiff strutted forgings, and titanium nitride-coated rings, which all add up to more power that is sustained longer

2-STROKE GP SERIES PISTONS

• Have additional features over standard Pro-Lite parts
• Each piston is E-Coated on the crown, ring grooves, and pin bore, for maximum wear resistance and protection from micro-welding, galling, and detonation
• Additionally, boost ports are removed for a more predictable powerband and increased pull on the top end
• GP Series parts generally have less machining on the outside, which helps seal up the bore for increased compression

NOTE: Service intervals may be increased with Racer's Choice pistons over conventional Wiseco pistons, and are for expert racers and tuners only.

• Forged from high-silicon aluminum alloy for maximum strength and dependability
• Wiseco offers a complete range of popular piston models and years for both trail and racing applications

WISECO FEATURES PRO-LITE PISTONS

• Innovative forging design and piston skirt provide maximum horsepower and torque
• Durability, longevity and increased horsepower

PK PISTON AND GASKET KITS

• Feature forged pistons, rings, wrist pins, circlips and top end gasket set
• Contain all the necessary components for overboring or rebuilding your top end
• Cylinder sleeves must be purchased separately
• See price list on page ???

WISECO PISTON PRICING

• All Wiseco High-Performance Motorcycle Pistons are priced with rings and circlips; see price list on page ???

4-STROKE RACER'S CHOICE PISTONS

• When blow-by starts to increase on other pistons and power starts to fade, Wiseco Race Series parts continue sealing and performing
• Now you can own the same race parts as all the top race teams
• These high-tech piston designs offer maximum compression ratios, ultra-stiff strutted forgings, and titanium nitride-coated rings, which all add up to more power that is sustained longer

2-STROKE GP SERIES PISTONS

• Have additional features over standard Pro-Lite parts
• Each piston is E-Coated on the crown, ring grooves, and pin bore, for maximum wear resistance and protection from micro-welding, galling, and detonation
• Additionally, boost ports are removed for a more predictable powerband and increased pull on the top end
• GP Series parts generally have less machining on the outside, which helps seal up the bore for increased compression

NOTE: Service intervals may be increased with Racer's Choice pistons over conventional Wiseco pistons, and are for expert racers and tuners only.

• Forged from high-silicon aluminum alloy for maximum strength and dependability
• Wiseco offers a complete range of popular piston models and years for both trail and racing applications

WISECO FEATURES PRO-LITE PISTONS

• Innovative forging design and piston skirt provide maximum horsepower and torque
• Durability, longevity and increased horsepower

PK PISTON AND GASKET KITS

• Feature forged pistons, rings, wrist pins, circlips and top end gasket set
• Contain all the necessary components for overboring or rebuilding your top end
• Cylinder sleeves must be purchased separately
• See price list on page ???

WISECO PISTON PRICING

• All Wiseco High-Performance Motorcycle Pistons are priced with rings and circlips; see price list on page ???

4-STROKE RACER'S CHOICE PISTONS

• When blow-by starts to increase on other pistons and power starts to fade, Wiseco Race Series parts continue sealing and performing
• Now you can own the same race parts as all the top race teams
• These high-tech piston designs offer maximum compression ratios, ultra-stiff strutted forgings, and titanium nitride-coated rings, which all add up to more power that is sustained longer

2-STROKE GP SERIES PISTONS

• Have additional features over standard Pro-Lite parts
• Each piston is E-Coated on the crown, ring grooves, and pin bore, for maximum wear resistance and protection from micro-welding, galling, and detonation
• Additionally, boost ports are removed for a more predictable powerband and increased pull on the top end
• GP Series parts generally have less machining on the outside, which helps seal up the bore for increased compression

NOTE: Service intervals may be increased with Racer's Choice pistons over conventional Wiseco pistons, and are for expert racers and tuners only.

• Forged from high-silicon aluminum alloy for maximum strength and dependability
• Wiseco offers a complete range of popular piston models and years for both trail and racing applications

WISECO FEATURES PRO-LITE PISTONS

• Innovative forging design and piston skirt provide maximum horsepower and torque
• Durability, longevity and increased horsepower

PK PISTON AND GASKET KITS

• Feature forged pistons, rings, wrist pins, circlips and top end gasket set
• Contain all the necessary components for overboring or rebuilding your top end
• Cylinder sleeves must be purchased separately
• See price list on page ???

WISECO PISTON PRICING

• All Wiseco High-Performance Motorcycle Pistons are priced with rings and circlips; see price list on page ???

4-STROKE RACER'S CHOICE PISTONS

• When blow-by starts to increase on other pistons and power starts to fade, Wiseco Race Series parts continue sealing and performing
• Now you can own the same race parts as all the top race teams
• These high-tech piston designs offer maximum compression ratios, ultra-stiff strutted forgings, and titanium nitride-coated rings, which all add up to more power that is sustained longer

2-STROKE GP SERIES PISTONS

• Have additional features over standard Pro-Lite parts
• Each piston is E-Coated on the crown, ring grooves, and pin bore, for maximum wear resistance and protection from micro-welding, galling, and detonation
• Additionally, boost ports are removed for a more predictable powerband and increased pull on the top end
• GP Series parts generally have less machining on the outside, which helps seal up the bore for increased compression

NOTE: Service intervals may be increased with Racer's Choice pistons over conventional Wiseco pistons, and are for expert racers and tuners only.