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5mm (105cc) big bore chamber 100+ octane - for use with big bore piston
We do not suggest using the HotRods 4519 crankshaft with the nylon inserts
SX85 StockSX86 (100+ octane)SX87 (105+ octane)
some stickers for your bike and tool box and installation instructions
Yamaha YZ250 YZ250X WR250 Phathead cylinder head kit 1999-2026 Chamber selection:Y22 - 20.1cc (100+ octane) We like cool stuff andYamaha YZ250 Phathead cylinder head kit 1999 2026 Chamber selection: Y20 22cc Stock compression for the X model Y21 21. 1cc Stock (91+ octane) Y22 20. 1cc (100+ octane) Y23 19. 1cc (105+ octane) YZ295 72mm 91+ octane 23. 8cc YZ296 72mm 100+octane 23cc 72mm chamber Does not fit Athena Phathead Kits include a head shell with one combustion chamber, two sets of o rings, cylinder head nuts, copper washers, some stickers for your bike and tool box and