SOHC.co.uk Forums > CB750

Engine full of fuel and seized up

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Trigger:

--- Quote from: Macabethiele on October 14, 2020, 10:15:03 AM ---I'm thinking the woodruff key has moved as part of your troubles - I can't see the crank being bent given the circumstances. It's definitely a mystery it will be very interesting when you finally locate the cause.

--- End quote ---

No woodruff key on a 750 SOHC  ;)

MrDavo:
If the gear is on a taper then it could have shifted to 'cockeyed' under a twisting stress, especially if there is any scope to move sideways, even by a fraction.If it is now fouling the case then it would still be hard to turn even from the kickstart.

Whatever I am glad you are getting to the bottom  of it, as the suspense is killing us.

This reminds me of when, as a teenager, I worked some evenings and weekends at a garage in Lancaster - even at school I had a Moggie Minor and a Triumph T100 to support. One day the boss asked me to come with him to help tow in a Mini estate that had clanked to a sudden halt in Galgate. We spoke to the lady driver, who told us that she had just topped the water up at a petrol station, and how it had taken ever such a lot to fill it right to the top. My boss asked her to show him where she had put this water, and she pointed to the oil filler cap on top of the rocker cover.  :o

PJM47:
Thanks for your continuing support on this one people.

After lifting the crank in an out a few times the large starter gear has come loose and is now free to move on the taper shaft, I can move it latterly by 5mm or so, it spins freely (independently of the shaft) clockwise but not anticlockwise. Not sure what is going on there.

But with the starter gear now floating loose on the shaft and the crank back in the case, the crank now rotates freely and smoothly, phew, so I believe somehow that gear had got jammed against the case causing the problem.

I need to get the special generator puller tool before I can look any further, and how to fix it is not yet clear but I'm thinking we are pretty close now...

Cheers
Paul

Trigger:
On the inside of the starter cog is a bronze bush, it is easy to see it that is damaged  ;)

You have done this a little arse about face as, you should of taken the fly wheel off before splitting the engine  ::)

philward:
No problem with the starter riing only turning one way as that's what it should do - so one thing less to worry about

Sent from my moto g(7) power using Tapatalk

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