Honda CR125 Phathead combustion chamber YZ250 Y20 - 22cc Stock compression

Y20 - 22cc Stock compression for the X model

4cc (110+ octane)

2cc (95+ octane)K23 - 19

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1cc (100+ octane)

Honda CR125 Phathead combustion chamber YZ250 Y20 - 22cc Stock compressionHonda CR125 Phathead cylinder head kit 1992 1999 Chamber selection: H13 6. 7cc stock compression H14 5. 8cc high compression Honda CR125 Phathead cylinder head kit 2000 2003 Chamber selection: H11 8. 2cc Stock compression H12 7. 6cc (95+ octane) H13 6. 7cc (100+ octane) H14 5. 8cc (105+ octane) Honda CR125 Phathead cylinder head kit 1988 1991 and 2004 2007 Chamber selection: K10 Stock K11 9. 2cc (95+ octane) K12 8. 5cc (100+ octane) K13 8. 2cc (105+