SOHC.co.uk Forums > CB500/550

Is it the starter motor?

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Oddjob:
I’ve seen one, and one only where the bronze bush in one of the end caps went oval, it would spin sometimes but not every time. However it took so much power to get it to spin that the battery was dead within seconds and the motor was starting to smoke.

I’ve got a few spare starter motors if you end up needing one but they are heavy as you know so postage would be high I reckon.

I’ve also started to mod the cable entry into the starter body, I’ll bet yours is like them all, braided cable showing bent at 90 degrees? I cut the cable off, solder on a stainless steel nut and bolt and replaced the black cable with some nice red cable. If it’s carrying high power it should be red imo, I even made a new battery to solenoid  cable in red. Just looks better and less chance of confusing it with the neg cable.

neat street:
Thank you all for your helpful tips..
Tricky Micky, the earth is on a nice clean section with no loss of current, so thank you, but this is not the issue here.
Ted, Thank you for the suggestion, could be an option, I supose that will be the next step, strip and check :-)
Otis, only have a CB750F1 which without checking, I think is different to the 500??
Coppertop, as this was a full rebuild, It wont start that easy I`m afraid as I cant get it to run and do the fine tunning... Lucky you had a spare :-)
Oddjob, Thanks for the suggestions, I guess the next thing is to take off and check. Maybe check the comutator for carbon build up and see if I can get some carbon brushes?? Good idea on the red cables.. maybe something worth thinking about later if I can get this one working :-)

Oddjob:
Just an idea but the starter earths through its 2 mounting bolts, the oring around the part in the engine isolates that part as it’s essentially rubber. If you’ve painted the crankcase maybe the earthing point is compromised by paint. Not sure if the metal spindle in the motor would make an earth, possibly.

I’ll post some pics of the starter motor modifications if you’re interested.

neat street:
Thank you oddjob, yes plese post the pics of the upgrade :-) no paint done around the area, but thanks for the thought.

neat street:
Well, after getting the starter out, have found that the bearing has gone oval and allowed the armature to rub on the stator.... I have checked for coninuity from the comutator and the main shaft and also the the laminations and I have continuity, so from here I would say its toast :-( found a couple of second hand ones on ebay, next stop order one.
Thank you all again for your input :-)

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