SOHC.co.uk Forums > CB750
Oil pressure issue / motor rebuild
AshimotoK0:
Glad it worked out for you mate. As I said my old mate Big Al had measured it up and he was apprentice of the year at the National Engineering Laboratory for 2 or 3 years running (used to go on the back of Midge Ure's BSA C15 to work) !! but I could only find the bit of paper with his measurements on for the one I am keeping. Bryan, Trigger & Oddjob are the sages on this, not myself, but I gather the old pro's just bang in GREENS anyway BUT tell the customer to run in very carefully. Maybe someone fitted GREENS and then thrashed it.
Bryanj:
It would not have seized, partial or otherwise, with those shells mate. I would just about guarantee bad oil/changes
MrDavo:
Ok, thanks for that info. A set of NOS yellow shells for the mains and greens for the big ends have been ordered from Yamiya750 in Japan, along with the oil seal for the crank, timing side. Last time I ordered anything from Japan (a JIS screwdriver) it took a month to come, in a ridiculously big box. Lets see how long this takes, in the meantime I shall continue to whittle away at scraping off the head gasket, delaminated but solidly baked onto the barrel, and I'll also do a valve regrind, and fit new valve seals.
The Athena gasket kit and plastiguage I bought off eBay arrived today. I have also polished the cam cover, which is why I wanted to take the engine out in the first place, before I realised there were crank issues.
AshimotoK0:
Yamiya is very quick delivery I think. They are very efficient to deal with. But I get mine in Japan and get someone in Japan to ship it for me as you get stung big time on import duty.
MrDavo:
B*gger, I hadn't thought of that, the parts were dear enough as it is. Also, if my new K1 seat, from Florida, was anything to go by, ParcelFarce bill you another £12 or so for the privilege of collecting the duty from you.
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