SOHC.co.uk Forums > CB750

Starter stays engaged with engine running

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Yoshi823:
I have had a starter solenoid apart in the past because insufficient energy was getting through to the starter motor. I put a resistance meter across the heavy duty terminals & the meter reading wasn't zero, so took it apart & found that the connectors inside were quite badly corroded. With everything cleaned it worked fine.

It may well be that the internal connector has become 'welded' so to speak to each other, or the spring has broken that would otherwise return the moving contactor to its 'rest' position.

This is the best that I could find of what the internals look like...

http://farm3.static.flickr.com/2262/2098020147_aa3b641136.jpg

Mr. Mac:
Awesome help, thanks to all.

Mr. Mac:
I replaced the solenoid with one that tested OK. Still the starter stayed engaged.
Tapping on the push button switch resulted in disengagement.
I know now it is the switch, the button does not stick (externally) but the contacts apparently stay closed, intermittently.
Contract cleaner and WD40 seemed to help.
How hard is it to remove the contact switch and inspect (clean better) or replace?
Mr. Mac

SteveD CB500K0:
Not difficult but watch out for the little springs when you open up the switchgear!

Bryanj:
As you are in the USA you will have the switch that turns the headlamp off before engaging the starter and they are extremely fragile with age and a pig to work on.

Sorry to say a complete RH switch unit is the way to go for you

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