SOHC.co.uk Forums > CB750

Cylinder head removed

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Yurkie:
@yozzer74 yes I've been watching hackaweek, and learning a lot. It's a shame he got the bike already torn down and cleaned up. Although I did watch the aluminium polishing episode today, which I somehow missed before, and he simply uses paint stripper. I am just trying to identify if all the engine was originally black as I appears to have been repainted at some point.


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Bryanj:
The stem seal tends to make the valve a push fit rather than a slide out fit BUT removing any mushroom is imperative as if you just hit the valve through you will irrepairably damage the guide which are not cheap, require carefull fitting then reaming and valve seats cutting. All this is imatterial if its an F2 as they eat valve guides for a passtime!!

royhall:
Bryan is dead on the money about the F2 valves. I assume its an F2, looks like larger valves plus black engine. You didn't say?

The exhaust valves will probably come out whatever as the guides are usually very worn.

This was caused by Honda fitting larger valves to the F2 to pep up the performance of the SOHC unit until the DOHC engine was ready. In doing so, they had to change the rocker geometry to get them in which resulted on a slight sideways push on the valves that wears them out.

There is a permanent repair solution for the F2 valves available from CycleX in the states. Its not cheap but worth it as you don't need to be pulling the engine every 20K miles.

Good luck with the build.

Yurkie:
Yes it's a F2. I see what you mean about not cheap! I'll put them on the list of parts to order. As Bryan suspect the stem ends are mushroomed, so I'll cut them off this weekend to get them out.


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UK Pete:
yurkie, i will be listing on ebay lots of new f2 parts soon, i have new pistons and rings valves valve guides, cylinder heads, all sorts of stuff, a NOS f2 exhaust system,NOS body work,, infact i have a complete bike to sell off, engine frame wheels etc
i will put the parts up on hear first but they wont be give away prices as they cost me lots,,
PETE

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