SOHC.co.uk Forums > CB750
Engine full of fuel and seized up
K2-K6:
Realistically the last place of acces without removal from frame is to take the sump off and check the chains (primary and cam) to asses if anything obvious is amiss there. Would help if you have one of those usb camera scope to use on phone or tablet to look up into the crank cavity, can't think of anything else useful to look at without stripping.
Oh! with a scope you can also look at the cam chain at the top through #3 inlet tappet cover to make sure it's not snapped. That's a pretty remote half chance and highly unusual but very remote possibility and worth a look-see.
PJM47:
So I've had a bit more time to look at this now. I can actually turn the engine over at the alternator, probably wasn't trying enough before. So that is good. When in gear though I can't turn the engine with the rear wheel and the kickstart is still locked solid. With the clutch removed the inner turns ok. The outer clutch basket I can't move by hand but it turns when I turn the engine over with the alternator bolt. I can select gears ok and i can select neutral. I guess this is a gear box issue? Maybe as a result of trying to use the kickstart when the starter wouldn't turn the engine when it was full of fuel, does this sound logical? Any ideas what might have broke?
Nurse Julie:
It sounds like a kick start issue. Put the bike in 5th gear and try and move back wheel.
Trigger:
Take the clutch basket out and see if the kick start will move ;)
JonnyB:
I'm with trigger. you need to ascertain if the engine will turn over. Normally with it in neutral the engine will turn over easily with a spanner on the crankshaft end.
If not remove the clutch or just the plates. if it still won't turn over it's engine. if it does it's clutch or gear box.
I've not read the whole post. have you drained the sump since? I've had this issue on a GS450. it locks the top and bottom and the clutch plates can bind.
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