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Honda CR85 86-07 Phathead Racing cylinder head kit
Use the NGK MR8BI or OE 2024+ spark plug
Yamaha YZ250 WR250 Phathead cylinder head kit 1988-1998
THey are slightly less compression on the 80cc bike but it is very close to the 85cc specs
Kawasaki KX250 Phathead Combustion Chambers Chamber selection:K23 - 19.4cc (100+ octane) Honda CR85 86-07 Phathead RacingChamber selection: 2005 2007 W21 21. 6cc Stock compressionW22 20. 2cc (95+ octane)W23 19. 4cc (100+ octane)W24 18. 3cc (105+ octane) 1995 2002 K21 21. 6cc Stock compressionK22 20. 2cc (95+ octane)K23 19. 4cc (100+ octane)K24 18. 3cc (105+ octane)