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CP
Pistons Yamaha YZ250F Dirt Bike Piston Kits Standard Bore, Big Bore and High Compression
YZ 250F Pistons
CP Pistons, for those that demand the
ultimate in engine performance!
High performance and racing Yamaha piston kits are available from CP
Pistons for all model years of the YZ250F four stroke dirt bikes. Standard bore size and
big bore YZ250F CP Pistons Yamaha dirt bike kits are all available here. These forged
pistons will work with oversize valves as well as high lift camshafts as they include
oversize valve reliefs. They incorporate a "X" style forging for greater
strength, durability and reduced weight. Along with the full radius dome designs, high
performance piston rings and lightweight piston pins, these pistons offer the highest
quality and are engineered for maximum power output.
CP Pistons dirt bike racing pistons are
used by top professional riders and teams including:
| Team Suzuki |
Ricky Carmichael |
Ivan Tedesco |
Ryan Dungey |
| MDK Speed |
David Vuillemin |
Nick Wey |
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| MDK/Lucas Oil/Yamaha |
White Bros. Yamaha |
Rick Ware Racing |
Team Solitaire |
| Standard Features included with each Yamaha YZ250F
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 |
Cometic top end gasket sets are available separately, but
are not included with the piston kit. The matching top end gasket kit for each application
is listed in the table below, along with the individual piston kit info.
| 2001 - 2004 Yamaha YZ250F CP Piston Kit YZF250
Stock
Bore size is 77mm (3.031") Stock Stroke is 53.6mm (2.110") |
| Part # |
Bore Size |
Cubic
Centimeters |
Compression |
Top End
Gasket Kit # |
Installation
Notes |
| cp m1028c |
77mm std. |
250 cc |
13-1 |
cp c3057est |
deglaze cylinder |
| cp m1029c |
77mm std. |
250 cc |
13.5-1 |
cp c3057est |
deglaze cylinder |
| cp m1033c |
79mm +2mm oversize |
263cc |
13.0-1 |
cp c3057est |
bore and replate cylinder |
2005 - 2010 Yamaha YZ 250F CP Piston Kit YZF250
Stock Bore size is 77mm (3.031") Stock Stroke is 53.6mm
(2.110") |
| Part # |
Bore Size |
Cubic Centimeters |
Compression |
Top End Gasket Kit # |
Installation Notes |
| cp m1032c |
77mm std. |
250 cc |
12.8-1 |
cp c3057est |
deglaze cylinder |
| cp m1034c |
77mm std. |
250 cc |
13.5-1 |
cp c3057est |
deglaze cylinder |
| cp m1035c |
77mm std. |
250 cc |
14.0-1 |
cp c3057est |
deglaze cylinder |
| cp m1036c |
79mm +2mm |
263cc |
12.5-1 |
cp c3057est |
bore and replate cylinder |
| cp m1050c |
80mm +3mm |
269cc |
13.5-1 |
cp c3059est |
requires sleeve or cylinder |
2005 - 2010 YZ250F FULL RACE Piston
Stock Bore size is 77mm (3.031") Stock Stroke is 53.6mm
(2.110")
Full race model pistons are custom forged pistons but available off the shelf. These are single ring, high compression, lightweight pistons which feature a highly efficient dome design that maximizes squish without compromising performance. Lateral gas ports are added to maximize ring seal while a skirt coating is included to provide additional lubrication, minimizing friction in extreme conditions. The full race
pistons come complete with high performance rings, lightweight pins and locks. |
| cp m1135c |
77mm std. |
250 cc |
14.25-1 |
cp c3057est |
deglaze cylinder |
The piston and gaskets listed on this page fit the
following model year YZ250F Dirt Bikes:
2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 Yamaha YZ 250F Piston Kits and Gaskets
© Motorsports Parts Corporation T/A Campbell Enterprises. All rights reserved
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