Used OEM Rotax Rear cylinder head with 31mm intake valves, 27mm exhuast valves, valve springs, valve seals, keepers, retainers and rocker arm assemblies.
Part numbers for this include 420613526 420613530 420613531 420613532
We disassemble, clean and surface plate the head, this is ready to install on your engine.
You may want to consider changing the valve seals although they have a very low failure rate!
This will not fit 1000 engines