SOHC.co.uk Forums > CB500/550

cylinderhead overhaul

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Bryanj:
I never bothered to work it out! Just used the Honda reamer and left it at that

Tomb:
I recently checked GSXR750 valves against the Suzuki factory manual, a mechanic mate was doing the head for a customer and couldn't understand why the valves were worn below bottom size with small amount of miles on the engine.

I measured the valve stem along its entire length, it was under all the way along, even the part that had not been in the guide, the finish was the same all along so it was obvious the guide area had not been bigger and worn down. The valves were all under size from new. Whether this was an engine mod Suzuki'd done later on and not updated the manuals I dunno. Check your stems all along the length before condemning them.

Your PDF manual chart shows 3 thou clearance for inlet and 4 though clearnce for exhaust as "serviceable limits", that is 'kin massive clearance!! known as piss fit in engineering. I'd be surprised if your valve to guide wear was that bad

To me its not the I.D's of the guides that matter most, its the "fit"  3 or 4 thou is a rattling piss fit. A nice fit is smooth gliding up and down of the valve in the guide with some oil on it, with no side play.

Sorry for so much waffle, crap at explaining whats in me 'ead ::)

andy_c101:
Yeah I tend to agree the actual bore dimensions alone, are somewhat academic, yes its the actual fit that counts.
- I've got a Honda Reamer on order, just waiting....

andy_c101:
Still waiting on David Silvers supplier for my valve guide driver & reamer.
"ETA is now end of September" !......yawn.

andy_c101:
Valve Guides now installed!!! :)

Boy! It has been a long saga.
Summer has been & gone off the road (but I didn't miss much this year!)

After a  long wait for the Driver tool (No 07942-329-0200)  & Extractor tool (No. 07942-329-0100).

I carefully followed the prescribed heat-n-freeze method.
Only to end up cracking the flange of the first valve guide !!
The Driver Tool is like a blind-hole socket, but it only contacts the flange of the guide.
(used Genuine Honda guides)
Plan B:  used the Extractor tool  to INSTALL, as this is a snug fit with the I/D of the guide and buts squarely at the top of the guide.  (I had realised the extractor removed the old guides fine, without damaging the ends, so I thought why not use it for installing?)

So while house was empty, did some baking!

 Heat-Freeze & lube oil. ...Bingo!....went in nicely with just a few taps.

Reamer worked a treat too.
just some valve lapping to do.

AC

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