Hello And Thank you for such a brilliant site I am in the trade and don,t no everthing this site has a wealth of information and help
Question I have just replace my cylinder head after a over heating problem I got a S/H one from jap parts
i relap Valves and reshimmed ? refitted ext and now it is fine but noisey and after thinking on it I believe that the head Ifitted may not of been a turbo as I have check the cam and the loobs are about 4.mm greater
than the original I will change it back but just wonder if that could be the case ???(2 CT engine)

- (#3566) James Rawlings, 29 Jun 02

Don't worry which cam is fitted, makes next to no difference IMO. Did you shim the valves to .2-.3, .25-.35? Doesn't take the clearance to be much more than .35 for noise. I find as long as there IS clearance with a cold engine (bucket free to rotate), it doesn't matter too much- clearance increases as the engine warms.
Funny, both times I've put a head on mine, I've checked the gaps off the engine, and once fitted, one closed up, to the extent that a valve would leak for the first 30secs running.

- (#3567) david miller, 29 Jun 02