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Yamaha YFM 350 Piston Kits Warrior Pistons Big Bear 350
Piston Kits Standard Bore and Big Bore
 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.
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. |
Wiseco YFM 350 Warrior Pistons, Piston Kits, Top End Gasket Kits YFM350 XT & WT Big Bear Piston Kits
These Wiseco Yamaha pistons, gaskets and kits fit the following models:
- 1987 - 2004 Yamaha Warrior YFM350 XT
- 1989 - 1999 Yamaha Big Bear YFM 350 WT
- 2005 - 2010 Yamaha Raptor 350
- 1999 Yamaha BW350T
- 1999 Yamaha Moto 4
| List of what is included with the different Wiseco part numbers listed below. |
Piston:
- Piston with coated skirts
- Piston Pin
- Piston Rings
- Pin Locks
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Top end " PK " kit:
- Piston with coated skirts
- Piston Pin
- Piston Rings
- Pin Locks
- Top End Gasket Kit
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Gasket kit:
- Complete premium top end gasket set.
- Includes cylinder base gasket, head gasket, o-rings, seals, etc.
- Exact contents vary based on engine
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Common YFM350 engine specifications
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| Bore Size |
ccs |
Comp |
Installation
Notes |
Piston |
Top End Kit |
Gasket Kit
(fits all models except 1999 BW350T) |
| 83mm std. |
349cc |
10.25-1 |
deglaze cylinder |
Wiseco
4419M08300
$150.09 $127.58
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Wiseco PK1018
$197.96 $168.27
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Wiseco W5746
$49.95 $42.46
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| 83.5mm +.5mm big bore |
353cc |
10.25-1 |
bore and replate cylinder |
Wiseco
4419M08350
$150.09 $127.58
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Wiseco PK1019
$197.96 $168.27
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Wiseco W5746
$49.95 $42.46
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| 84mm +1mm big bore |
357cc |
10.25-1 |
bore and replate cylinder |
Wiseco
4419M08400
$150.09 $127.58
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Wiseco PK1020
$197.96 $168.27
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Wiseco W5746
$49.95 $42.46
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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.
| Standard Features that were included with each Yamaha YFM
350 Warrior Big Bear 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
included: Piston,
Piston Pin,
Piston Rings,
Pin Locks
1987 - 2004 Yamaha YFM 350 Warrior ATV CP Pistons
brand Piston Kit
2005 - 2006 Raptor 350 ATV CP Pistons brand Piston Kit
Stock Bore: 83mm (3.268")
Stock Stroke: 64.5mm (2.539") |
| Part # |
Bore Size |
Cubic
Centimeters |
Compression |
Top End Gasket Kit # |
Installation
Notes |
| cp m1012 |
83mm std. |
349cc |
10.5-1 |
cp c7096 |
deglaze cylinder |
| cp m1013 |
83.5mm +0.5mm |
353cc |
10.5-1 |
cp c7096 |
bore and replate cylinder |
| cp m1014 |
84mm +1mm |
357cc |
10.5-1 |
cp c7096 |
bore and replate cylinder |
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