Suzuki RM250 Phathead combustion chambers CR85 big bore kit SX50 Stock

SX50  Stock

two sets of o-rings

Athena KX125 144cc big bore compatible

Kawasaki KX500 Phathead cylinder head kit with compression release 1988-2004

HF23  -  15

Suzuki RM250 Phathead combustion chambers CR85 big bore kit SX50 StockSuzuki RM250 Phathead cylinder head kit 2003 2009 Chamber selection: Y21 21. 1cc StockY22 20. 1cc (95+ octane)Y23 19. 1cc (100+ octane) Suzuki RM250 Phathead cylinder head kit 2001 2002 Chamber selection: S31 17. 6cc Stock S32 16. 4cc (95+ octane) S33 15. 5cc (100+ octane) S34 14. 4cc (105+ octane) Suzuki RM250 Phathead cylinder head kit 1996 2000 Chamber selection: S21 20. 6cc Stock S22 19. 2cc (95+ octane) S23 18. 2cc (100+ octane) S24 17. 6cc (105+