SOHC.co.uk Forums > CB500/550
550 F2 started!
Laverdaroo:
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Oddjob:
You could try using a piece of wood/plastic to stop the starter gear from moving, start the engine on the kickstart and see if it spits out the wood due to the sprag clutch engaging with the starter gear when it shouldn’t be. If the gear is spinning with the engine I’d say that means the sprag clutch is either broken inside or it’s sitting at an angle which allows it to grip the body where the rollers sit and thus spin with it.
Moving a starter motor shaft by hand requires some effort, they don’t spin free at all. So if it’s being spun by the engine when the engines in motion there is clearly something wrong going on inside there.
If it doesn’t spin then I’d say fixing the starter motor should solve the problem. Even if it only cures it for a year or so it would be worthwhile as that allows the primary chain to slacken off a little, I’d imagine disengaging the chain from the gear on the hub would be very difficult when it’s brand new, that’s of course referring to the keyhole method of removing the primary hub.
I’d agree on the end float question as well, they all have some.
Trigger:
You are over thinking the starter motor, It turns easy between the thumb and finger with the only resistance being the brushes contacting the commutator.
Once i have checked the insides of a starter motor, i just test it by earthing one of the long screw on a car battery and touching the live wire. It will start spinning with a it jump in your hand. If it spins fast and only a slight whirling noise, it is fine ;)
Laverdaroo:
Yeah,Graham if you read, the starter is fine it’s the starter clutch under investigation/under question as a result of fault funding. The starter is tested and is all good and refitted on the engine, as written last night
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Trigger:
Sorry, missed that bit, you are working too fast for me ;D Starter clutch is easy, just fit a new kit as, it is hard to sort out what is worn if, you don't have a new set to compare. That is if you never fitted a new kit when you first built the engine ;)
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