SOHC.co.uk Forums > CB750
Engine full of fuel and seized up
Bryanj:
The gear runs on the parallel bit of the crank, i have seen the clutch ass come loose on the back of the rotor but not often.
I think the owner might like to look at the job lot of 750 parts in another thread where at least one of those cranks sould be usable
PJM47:
--- Quote from: K2-K6 on October 14, 2020, 05:39:22 PM ---
There's a sectioned schematic of it in the original 750 manual (doesn't appear in last one) that may help, check Ash's dropbox stash for a look. If not there I can photo and post from mine.
--- End quote ---
Thanks, found the one in Ash's dropbox, much clearer.
PJM47:
Generator wheel and starter gear now removed. Can't see any problems with any of it. Only thing I'm not sure about is if the gear is meant to be able to move about a bit on the shaft.
So do just put it all back together now? Perhaps the starter gear was just seized up a bit from when there was no oil? It's all free now anyway.
I'll replace all the seals and gaskets, anything else worth replacing/checking whilst its apart? Nothing is in particularly bad condition, little bit of wear on some of the main bearings. I leak tested the valves and all seems good is it best to leave those alone?
paul G:
I think that would be a false economy not replacing the bits that you can while you are in there.
Primary drive chains and cam chain if they need it.
Why would you want to tear it down again.
Lapping in the valves is a simple job and replacing the valve stem seals is a no brainer :o they are in the gasket kit anyway.
Trigger:
As PaulG has said, you are in there and you don't want to take it apart again as Paul G knows very well ;)
Look at changing the primary chains, cam chain to a up graded FTH DID, all the o,rings, including oil pump and inspect the primary chain tensioner to see if it has gone hard and brittle, check the cam chain tensioner, mid wheel and cam blade for brittleness, cracks or chips. Check the piston rings are not suck in there groves and turn easy. I would throw another set of rings on to be on the safe side and they can be bought for around £40 for a full set. Always use a top quality gasket set and upgrade the O'rings that are in the kit.
Put the crank on a bench and put all the rods on in the correct order and the right way round, torque them up and make sure they turn on the crank very easy with no tight spots ;) Build up the bottom end first and test everything before even temping to put the top end on.
We like pictures so, loads of photos as you go and we can advise if something is not quite right.
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