YFZ450R YFZ 450R Crank Cases 98mm Big Bore Stroker 520cc Rebuild Hotcams Valves
YFZ450R YFZ 450R Crank Cases 98mm Big Bore Stroker 520cc Rebuild Hotcams Valves
YFZ450R YFZ 450R Crank Cases 98mm Big Bore Stroker 520cc Rebuild Hotcams Valves
YFZ450R YFZ 450R Crank Cases 98mm Big Bore Stroker 520cc Rebuild Hotcams Valves
YFZ450R YFZ 450R Crank Cases 98mm Big Bore Stroker 520cc Rebuild Hotcams Valves
YFZ450R YFZ 450R Crank Cases 98mm Big Bore Stroker 520cc Rebuild Hotcams Valves

YFZ450R YFZ 450R Crank Cases 98mm Big Bore Stroker 520cc Rebuild Hotcams Valves

Regular price$4,176.00
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FITS ALL YAMAHA YFZ450 FI MODELS AND YEARS!  520cc OF BOLT ON POWER!
    • 98mm NEW DESIGN big bore cylinder
    • BRAND NEW OEM CRANKCASES
    • Wiseco JE or CP forged piston**
    • Hi temp piston rings
    • Chrome wristpin
    • Circlips
    • +5mm Crankworks stroker crankshaft with rod assembled and welded at pin
    • Stage 3 Hotcams
    • Pro-X valve springs
    • OEM retainers and collars
    • Pro-X intake and exhaust valves
    • Kibblewhite viton valve stem seals
    • MAXLOCK head stud kit - LIFETIME WARRANTY*
    • Clutch kit (fibers, steels, springs)
    • Crank bearings
    • Crank balancer bearings
    • Transmission bearings
    • Shift cam bearing
    • Clutch arm needle bearing
    • Complete water bearing
    • Water pump shaft with impeller
    • Oil pump 
    • K&N oil filter
    • NGK spark plug
    • Complete gasket kit
    • Cometic MLS big bore head gasket
    • Water pump mechanical seal
    • Complete crankcase oil seal kit 
    • Cam chain
    • All parts are brand new and aftermarket
    • Piston uses pump or race gas
    • No case or head mod required
    • 1 year warranty*

    *Warranty: We stand behind all parts we sell 100%.  Everything we sell has been tested hundreds if not thousands of times and when installed and tuned correctly they work over 99% of the time.  Part failures happen, but it is rare that it is not due to being installed incorrectly.  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 it is the responsibility of the person assembling and tuning the engine to make sure everything works correctly.  It requires special tools and has to be done 100% correct.  Many parts must be measured down to .01”.  We ALWAYS STRONGLY recommend parts be installed by a qualified, experienced mechanic.  Warranty does not cover failure that is a result of improper installation, tuning, break in, or misuse.   STUD WARRANTY: If for any reason a stud fails during use, not installation, we will send a completely new stud kit.  No other parts or any labor are included, and it can not be converted to a refund or discount on any order.  Studs must be returned to us for inspection first.  ALPHA CUB WARRANTY: If your Alpha Cub cylinder fails for any reason not related to installation, tuning, break in, or misuse we will fix the cylinder free of charge.  If it can not be fixed we will supply you with a new one.

    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!

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    Cut em Up!

    Dune Goons Rider ~ Breanna
    Showing her personal style and cutting the shirts up to her liking. We don't mind one bit! Cut em Up!