SOHC.co.uk Forums > CB500/550

Very stiff turnover

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masonmart:
Just finished assembling a CB500 engine. I'd had to change the crankcases because they were cracked and I couldn't get the right main bearing shells for the replacement case/crank match. Anyway, what I've found is that even with no plugs in it's difficult to turn it over on the kick start. I can turn it over by hand using the generator. I had the casings all Cerakote coated and I have a horrible feeling he may have done the insides and the mains and camshaft bearings are gripping but maybe not. It has a 605cc kit fitted but it was never run.

This is my first build and I'm sure that the gearbox is fine and the valves and everything else does what they're supposed to do but is this something that can be seen on rebuilds and are there any fixes

Johnwebley:
did the crank turn easily before you fitted the pistons and barrels?

Trigger:
Did you plastigauge the shells and make sure all clearances were correct ?
How did you get it clean to Cerakote coat the engine ?

mike the bike:
I once made the mistake of using Loctite bearing fit to the shells and that made the crank very stiff to turn.  After scraping the stuff off, it was OK.

masonmart:

--- Quote from: Johnwebley on July 28, 2016, 05:57:52 PM ---did the crank turn easily before you fitted the pistons and barrels?

--- End quote ---

John, it seemed to turn nicely before I put the top end on but I didn't check it again until I'd finished installing the top end. I improved it a bit by taking the head cover off and rubbing down the camshaft bearing surface a bit but still not enough improvement.

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