SOHC.co.uk Forums > CB750
Engine full of fuel and seized up
K2-K6:
--- Quote from: Trigger on October 06, 2020, 02:38:44 PM ---
--- Quote from: K2-K6 on October 06, 2020, 02:19:41 PM ---
--- Quote from: PJM47 on October 05, 2020, 07:01:25 PM ---Yes anti clockwise, it actually turns both ways. will check things you suggest and and try the basket back on tomorrow.
--- End quote ---
Could be that the starter sprag clutch was jammed so trying to turn the starter motor (from mechanical means) all the time.
Could try removing the starter motor and see what you get.
As Graham says, it's not adding up so something we're missing somewhere.
--- End quote ---
If the alternator housing is off, all you need to do is remove the small cog that connects the flywheel to the starter motor so, no need to remove the starter ;)
--- End quote ---
Ooops, I forgot the alt cover was off :)
Also then, can check the sprag clutch by rotating the big gear, should try to turn turn the crankshaft if pushed anti clock, and spin freely if you rotate clockwise.
royhall:
Don't forget when the basket is out all turns well so not going to be starter or sprag clutch. My money's on the part that trigger posted a picture of, something has seized in that. That's the union piece between the two halves of the engine. This is like a whodunnit murder mystery.
PJM47:
So looking at the picture the Blue arrowed part moves when I turn the crank. The red arrowed part moves when in gear and I turn the rear wheel. I put the basket back in one more time just to check and the kick start won't budge with basket in.
I also removed the cog that connects to the starter motor and this made no difference.
K2-K6:
A question PJM47, when you turn the crankshaft with the alternator, how far is that turning? Can you rotate it complete revolution in both direction?
K2-K6:
--- Quote from: royhall on October 06, 2020, 03:21:51 PM ---Don't forget when the basket is out all turns well so not going to be starter or sprag clutch. My money's on the part that trigger posted a picture of, something has seized in that. That's the union piece between the two halves of the engine. This is like a whodunnit murder mystery.
--- End quote ---
I was thinking the same Roy, but with all assembled AND in neutral, then the whole lot can go round unimpeded. Very puzzling.
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