Description
Suzuki RM80 RM85 Phathead cylinder head kit 1991 2025+ Chamber selection:52 53mm big bore chamber 100+ octane 5 91+(100 suggested) ECU remap required for CR125R9302 yz65 Chamber selection:H31 20.5cc 95+ octane 5 91+(100 suggested) Our chambers are cut for the 85cc bore but work just fine with the 80cc bore as well