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CP Pistons Yamaha YFZ 450 Piston Kits Standard Bore, High Compression YFZ 450 Big Bore PistonsFits 2004 2005 2006 2007 2008 2009 YFZ 450 models
CP Pistons, for those that demand the ultimate in engine performance!High performance and racing Yamaha forged piston kits are available from CP Pistons for all model years of the YFZ450 four stroke ATV's. Standard bore size and big bore YFZ 450 CP Pistons Yamaha ATV 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. We also have high compression YFZ 450 piston kits available.
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.
The 2006 and newer engines use a slightly longer stroke crankshaft, which is why the engine ccs and compression listed below is different than for the 2004 - 05 YFZ450 engines.
Bore Size |
ccs |
Compression |
Installation |
Notes Piston |
Top End Kit / Big Bore Kit |
Gasket Kit |
95mm std. |
439cc |
449cc 2004-2005 12-1 |
2006 - 2009 12.25-1 deglaze cylinder |
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95mm std. |
439cc |
449cc 2004-2005 13-1 |
2006 - 2009 13.25-1 deglaze cylinder |
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96mm +1mm big bore |
449cc |
459cc 2004-2005 12-1 |
2006 - 2009 12.25-1 bore and replate cylinder |
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96mm +1mm big bore |
449cc |
459cc 2004-2005 13-1 |
2006 - 2009 13.25-1 bore and replate cylinder |
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98mm +3mm big bore |
468cc |
478cc 2004-2005 12-1 |
2006 - 2009 12.25-1 bore and replate cylinder |
or purchase CK kit which includes new cylinder
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This is a complete big bore kit which includes a new cylinder
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| 95mm std. | 439cc 449cc |
2004-2005 13.75-1 2006 - 2009 14-1 |
deglaze cylinder |
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not available |
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Yamaha YFZ 450 Performance Parts and Racing Parts
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The piston and gaskets listed on this page fit the following model year Yamaha YFZ450 ATV Race Quad:
2004 2005 2006 2007 2008 2009 YFZ 450
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We hope you will choose to purchase your CP Pistons, Wiseco, Hot Cams and CV4 products from us here at Campbell Enterprises. For the many other parts you need for your dirt bike or quad we recommend the following companies. We hope you find them helpful and that they save you some cash. We figure the more they save you, the more you have to come back and visit us with For OEM (Original Equipment Manufacturer) parts we recommend BikeBandit for OEM parts & online schematics For riding gear, apparel and accessories Cycle Gear is a good choice. In addition to those two we also shop at Motorcycle Superstore Great Deals on other Motocross Parts and Accessories
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. They have a huge selection of aftermarket parts also.
and MotoSport.com
. If you have the time it is a good idea to check with each of them to compare prices. They all often run special sales, offer free shipping, etc. so you can often save a bit more by checking them all out before making a purchase.
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Once in a while we all need (or are forced due to injury) to do something other than play in the dirt. For those times Bass Pro Shops is a favorite for many of us outdoor types.
On those long trips everyone enjoys good music or a movie and the iTunes Store is a frequent stop.
For those of you that drive an RV to the races or riding area, The Good Sam Club offers Emergency Road Service, and many other helpful plans to take some of the worry out of those long road trips and save you some serious money. They also have a great Extended Service Plan and they want to pay your RV repair bills.
And for the golfers out there, The Golf Card offers great discounts for green fees, Pro Shop item purchases and more at over 3000 courses nationwide. If you enjoy getting in a few rounds while you are traveling, then this program can really save you a lot of money every year. Get Golf Card today and receive a free 1-year subscription to Golf Magazine!
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