SOHC.co.uk Forums > CB500/550

Strange noise when using starter, CB550 K3

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mike the bike:
The starter doesn't use the bendix gear principle,  It's permanently engaged (sort of) using 3 roller clutches to drive a starter gear when the starter is operated.

matthewmosse:
Sounds to me like the starter is staying engaged possibly, had it on our landrover once or twice too, think one of my 500s or 550s has done it a few times intermittently , but I have never had a sohc starter motor fail on me, despite abuse. I know the sound well, but cannot point a finger at the exact cause with cirtainty, on my bikes it has worried me then gone away with no actual known fix or dammage.

JamesH:
Yeah it's the sprag clutch withdrawing too slowly I reckon. Experienced exactly the same noise on a cb450 k7

matthewmosse:
Thinking more about it, I think a few decent oil changes sorted mine, the kind of thing that hondas do to tell you the oil is low or poor. My first 500/4 had oil like tar and the starter either did that or spun without engaging when I first got it, only intermittently but after about the 3rd oil change it got super reliable on the starter and I no longer had to resort to bump starts ( kick starter rounded off too) good thing it started easily.

Pasoren:
OK, thanks for the input! I will try lubricating the bushing in the starter motor, and if it helps, I may get a kit to refurbish the motor.

I can probably borrow another starter motor to test. Will try the easy things first!

Thanks!

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