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Yamaha Raptor 350 Piston Kits Standard Bore & Big Bore Raptor 350 353 357 Piston Kits by Wiseco Pistons

Yamaha Raptor 350 wiseco pistons

High performance and racing Yamaha Raptor 350 piston kits are available here. Buy the best Wiseco 350 Raptor Pistons for all model years of these popular ATV's. We offer standard bore and big bore Raptor 350 piston kits.

Every Wiseco 350 Raptor piston is engineered to provide the best installed clearance to produce the most  torque and horsepower possible. In addition to power, these pistons are designed to give the least wear and best possible piston ring seal at the engines operating temperature. Wiseco forged Raptor 350 pistons include coated skirts and provide greater strength, endurance and lighter weight compared to stock type pistons. These piston kits include performance piston rings and lightweight piston pins and offer superior quality and are engineered for maximum all around performance and reliability.


Wiseco Raptor 350 Pistons, Piston Kits, Top End Gasket Kits and Raptor Standard Bore, 353cc, and 357cc Big Bore Piston Kits

Wiseco YFZ 450 Pistons and YFZ450 Big Bore Kits

These Wiseco Yamaha pistons, gaskets and kits fit the following models:

2005 206 2007 2008 2009 2010 2011 2012 Yamaha Raptor 350

List of what is included with the different Wiseco part numbers listed below.


  • Piston with coated skirts
  • Piston Pin
  • Piston Rings
  • Pin Locks

Top end " PK " kit:

  • Piston with coated skirts
  • Piston Pin
  • Piston Rings
  • Pin Locks
  • Top End Gasket Kit

Gasket kit:


  • Complete premium top end gasket set.
  • Includes cylinder base gasket, head gasket, o-rings, seals, etc.
  • Exact contents vary based on engine

Common Yamaha 350 Raptor engine specifications

  • Stock Bore is 83mm
  • Stock Stroke is 64.5mm
  • We can provide cylinder bore and replate work, please contact us for assistance


Bore Size ccs Comp Installation
Piston Top End Kit

Gasket Kit

83mm std. 349cc 10.25-1 deglaze cylinder

Wiseco 4419M08300


Wiseco PK1018


Wiseco W5746


83.5mm +.5mm big bore 353cc 10.25-1 resize cylinder

Wiseco 4419M08350


Wiseco PK1019


Wiseco W5746


84mm +1mm big bore 357cc 10.25-1 resize cylinder

Wiseco 4419M08400


Wiseco PK1020


Wiseco W5746




* NOTE: CP Pistons have discontinued the below listed pistons. We are keeping this information available on our website for anyone who may need the original specifications or info on the CP Raptor 350 Pistons.

CP Pistons Yamaha Raptor 350 ATV Piston Kits Standard Bore & Raptor 350 Big Bore Piston

Yamaha ATV CP Pistons Logo

CP Pistons, for those that demand the ultimate in engine performance!

High performance and racing Yamaha piston kits were available from CP Pistons for all model years of the Yamaha Raptor 350 four stroke ATV's. Standard bore size and big bore Raptor 350 CP Pistons Yamaha ATV kits were available. These forged pistons will work with oversize valves as well as high lift camshafts as they include oversize valve reliefs. They incorporated a "X" style forging for greater strength, durability and reduced weight.

CP Pistons ATV racing pistons are used by top professional riders and teams

Standard Features included with each Yamaha Raptor 350 CP Piston Kit:
Double forced pin oilers Fully CNC Machined
Accumulator groove Pick lock removal grooves
Anti detonation grooves X-style forging
Light weight pins Balanced to + or - 1 gram

Each of the below kits originally included:
Piston Pin
Piston Rings
Pin Locks

2005 - 2010 Yamaha Raptor 350 Piston Kit and Big Bore Raptor 350 Pistons
Stock Bore is 83mm (3.268")
Stock Stroke is 64.5mm (2.539")
Part # Bore Size Cubic
Compression Top End Gasket Kit # Installation
cp m1012 83mm std. 349cc 10.5-1 cp c7096 deglaze cylinder
cp m1013 83.5mm +0.5mm 353cc 10.5-1 cp c7096 resize cylinder
cp m1014 84mm +1mm 357cc 10.5-1 cp c7096 resize cylinder



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