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They have the side of the piston forged and their pin bosses moved inward toward the center
BPRATV YZ250 Stock Bore Cylinder Head with Titanium Acorn Cap Nuts
Bearings Made in Germany / France / Italy
and you can do anything from stock ported cylinders to a +10mm DM
trued & welded crankshaft engineered for maximum durability and power
03 04 WR450F WR 450F 98mm CP Big Bore Piston 13.5:1 478cc Cometic Top Gaskets Big Bore They have the side ofHigh Performance 98mm CP Big Bore Piston Kit for Yamaha WR450F (2003 2004) Boost Power to 478cc! Unleash the full potential of your Yamaha WR450F with our premium 98mm CP Big Bore Piston Kit! Specifically designed for 2003 and 2004 models, this kit transforms your bike's performance by increasing displacement to an impressive 478cc and elevating your compression ratio to 13. 5: 1. Whether you're hitting the track or tackling tough trails, this upgrade
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