YFZ450 Big Bore Kit 98mm +3 Cylinder Top End Rebuild Assembly 480cc Kit
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BPR 98mm big bore cylinder
98mm Wiseco or Wossner big bore forged piston 12.75:1 or 13.75:1 if desired.
Nitrite coated piston rings
Chrome wristpin
Circlips
Top end gasket kit
Cometic MLS head gasket
Runs on pump or race gas
Works on all carb model Yamaha YFZ450 vehicles
1 year warranty*
*Warranty: We stand behind all parts we sell 100%. If after installation there is an issue contact us for a warranty return. This product is NOT DIY. Over 99% of people in the world are not qualified to build an engine, and the party performing the work is responsible for ensuring the parts are correct and installed properly. We ALWAYS STRONGLY recommend this be done by a qualified, experienced mechanic. Warranty does not cover failure that is a result of improper installation, tuning, break in, lack of maintenance, or misuse. For any warranty to be considered the part(s) in question must be sent to us for inspection. We do not warranty parts based on phone calls, photos, emails, what you read online, or another mechanic's assessment alone. We have a good warranty program, but there is a procedure that must be followed.
We ship next day most of the time. Modquad parts are shipped Monday-Thursday. Engine Kits are 3-5 business days.
We don't do backorder! If your items has already sold you will be notified immediately and you money refunded on the spot.
Sold items are removed daily.
If you see it on this website, it is 100% in stock unless it just sold before you clicked buy.
If you call we answer, if you text we respond, if you have a question we respond. Sometimes we sleep so it could be next morning but we will respond.
Thank you for shopping with us! We appreciate you!
