Yamaha YFM 350 Piston Kits Warrior Pistons Big Bear 350 Piston Kits Standard Bore and Big Bore
Every Wiseco piston is designed with the proper installed clearance to produce the most power, least wear, and best piston ring seal at operating temperature, for each application. Wiseco forged pistons include coated skirts and provide greater strength, durability and reduced weight compared to stock type pistons. These pistons come with performance piston rings and lightweight piston pins and offer the highest quality and are engineered for maximum performance and durability. |
High performance and racing Yamaha piston kits are available here. Buy the best Wiseco
Pistons for all model years of the YFM350 Warrior / 350 Big Bear four stroke ATV's. Standard
bore size and big bore YFM 350 Big Bear / Warrior 350 big bore Wiseco Pistons Yamaha ATV kits are listed below.
Wiseco YFM 350 Warrior Pistons, Piston Kits, Top End Gasket Kits YFM350 XT & WT Big Bear Piston Kits |
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| List of what is included with the different Wiseco part numbers listed below. | ||
Piston:
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Top end " PK " kit:
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Gasket kit:
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Common YFM350 engine specifications
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Stock Bore is 83mm
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Stock Stroke is 64.5mm
Notes
Gasket Kit
(fits all models except 1999 BW350T)
Wiseco 4419M08300
Wiseco PK1018
Wiseco W5746
Wiseco 4419M08350
Wiseco PK1019
Wiseco W5746
Wiseco 4419M08400
Wiseco PK1020
Wiseco W5746
CP Pistons, for those that demand the ultimate in engine performance!NOTE: The below pistons have been discontinued by CP. We are keeping this information available as a tech resource to anyone who may need the original specifications for these pistons. High performance and racing Yamaha piston kits were available from CP Pistons for all model years of the YFM350 Warrior / 350 Big Bear models. These forged pistons will fit with oversize valves and high lift camshafts because they had oversize valve reliefs. They incorporated a "X" style forging for greater strength, durability and reduced weight.
Each of the below kits included: Piston, Piston Pin, Piston Rings, Pin Locks 1987 - 2004 Yamaha YFM 350 Warrior ATV CP Pistons
brand Piston Kit |
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| Part # | Bore Size | Cubic Centimeters |
Compression | Top End Gasket Kit # | Installation Notes |
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| 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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