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CB750F1 Valve guide reaming

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martin_uk:
Just spoken to guy that usually does my machining and has fitted a new guide for me.

Only one was needed and bought a genuine Honda one from DS

He says that a non standard reamer is required and he does not have one :-(

Anyone have one to loan or recommend where to get?

Just off to collect.

I am making progress on my final? CB750, but slower progress than first ones.

Frame and wheels just about there, assembled lower engine.

Cylinders rebored and ready to paint, now need to finish top end and make up a set of carbs from all the bits ::)

Thanks

martin_uk:
I have checked and appears to be a 6.6mm reamer required.

Found one in Germany on Ebay,  so will see how it works out.

Trigger:
It depends on how much your valve stems are worn or if you are using new valves and what the stem size is  ;)
I ream the valve guides to the stem size and then use a expanding ream to ream to spec.

Yoshi823:
When I machined 8 new valve guides out of ally-bronze I reamed them to size (6.6mm) after they'd been inserted into the head. I bought this special size from a local engineering firm for not a lot (I think that it was about £10 but it was a long time ago).

I then had the valve seats recut to accept new valves.

Trigger:
Putting new valve guides in will always require the valve seats to be re ground as, it it near impossible to ream true to a seat  ;)

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