SOHC.co.uk Forums > CB750
Removing head with engine in.
royhall:
Sorry head won't come off unless you remove the engine or cut the frame tubes and weld in a removable section.
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Bryanj:
Valve seats are fine for unleaded, what engine is it as the F2 wears out valve guides
onethumb:
Hi Bryan. It's the 1978 f2. Doh. Any recommendations for getting new ones pressed in, and do I now do all of them?
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Bryanj:
You will need to remove and totally strip the head and check for wear between valve stems and guides, if new are required (exhaust wear more than inlet) you need to find a motorcycle competent machinist as the guides need reaming to size after fitting and the valve seats will need re-cutting. I believe there is an American firm that does replacement parts but be prepared to sit down before getting prices, I would expect just the work to be over £100 and parts £200+ not including gaskets
http://www.dynoman.net/engine/valves/index.html#F2 Valves and guides $250 ish plus shipping
Trigger:
--- Quote from: Bryanj on February 18, 2017, 06:42:18 PM ---You will need to remove and totally strip the head and check for wear between valve stems and guides, if new are required (exhaust wear more than inlet) you need to find a motorcycle competent machinist as the guides need reaming to size after fitting and the valve seats will need re-cutting. I believe there is an American firm that does replacement parts but be prepared to sit down before getting prices, I would expect just the work to be over £100 and parts £200+ not including gaskets
http://www.dynoman.net/engine/valves/index.html#F2 Valves and guides $250 ish plus shipping
--- End quote ---
Valve seats re- ground Bryan ;) Old Honda seats do not like to be cut ;D
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