SOHC.co.uk Forums > CB750
Engine full of fuel and seized up
PJM47:
Note it was definitely the starter gear that was the problem, then crank was in and out several times and fully oiled and nothing else connected, it was just resting on the bottom shells but it still would not turn freely. On one of the occasions of taking the crank out the starter gear came loose a bit and then everything was instantly fine after that. Still seems very odd to me.
PJM47:
--- Quote from: Nurse Julie on October 19, 2020, 02:03:30 PM ---
--- Quote from: PJM47 on October 19, 2020, 02:01:13 PM ---so most bits on order now (ouch).
Without wanting to start too much of a debate what's the best / recommended sealant for the bottom end? I've seen other posts but not really a conclusion.
--- End quote ---
Honda Bond, 3 Bond , Yam Bond etc for crank case halves only. The lightest, lightest smear, so light, you can almost see through it.
--- End quote ---
Thanks, blimey Honda bond 4 is reassuringly expensive isn't it. Don't want it leaking though.
Bryanj:
Only thing i can think of is the bush in the big gear is worn and allowed the gear to cock sideways, could be worth checking play to crank.
Sold a nos one to the states last year!
royhall:
Trying to turn a locked engine on the starter has probably knocked it out of line.
PJM47:
I sssume that bush is not replaceable?
I wonder if the bush has pushed in/back slightly under the stress allowing the gear to move further up the shaft than normal and hitting the case and also getting stuck? On the plus side at least the gear can be replaced after the engine is back together.
First pic is mine, secon pic is a used one on eBay.
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