SOHC.co.uk Forums > CB750
Engine full of fuel and seized up
K2-K6:
"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."
That's the correct operation of it, a very clever "sprag" clutch that will spin the crank in one direction when actioned by the starter motor, but be completely free in rotation in the opposite direction. It stays still while the motor runs and is virtually frictionless.
It means the starter doesn't have to be engaged/disengaged unlike a car system.
philward:
--- Quote from: Trigger on October 14, 2020, 01:25:17 PM ---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 ::)
--- End quote ---
Will be difficult to get it off now even with the tool due to holding the crank - should be doable but more difficult
Sent from my moto g(7) power using Tapatalk
PJM47:
Ok learning a lot here.
Managed to get the generator nut off, just waiting for the puller tool now.
Although the starter gear is now behaving more correctly (it didn't spin any direction before, only just realised that wasn't normal!) I assume there is still something wrong? In normal operation is that cog free to move a bit latterly. I assume it's not meant to be able to rub the case if it wants?
Bryanj:
Still doubt the starter gear caused the problem
K2-K6:
--- Quote from: PJM47 on October 14, 2020, 03:44:39 PM ---Ok learning a lot here.
Managed to get the generator nut off, just waiting for the puller tool now.
Although the starter gear is now behaving more correctly (it didn't spin any direction before, only just realised that wasn't normal!) I assume there is still something wrong? In normal operation is that cog free to move a bit latterly. I assume it's not meant to be able to rub the case if it wants?
--- End quote ---
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.
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