SOHC.co.uk Forums > CB750
not starting with push button
El__burro:
Good day, I am struggling to start the bike with the push button.
The bike (k2) starts easily with the pedal and all lights, indicators and horn are ok.
I have had a look at all the wires to see if any shorts on the frame but nothing seems wrong.
I guess it doesn't recharge the battery either.
HINTS
Starter relay clicks so I assume it works fine.
When I press the start button i hear the buzzing noise but no cranking.
Battery is full (14.5v) but as soon as I remove the charging cables it slowly drops to 12.2v then around 9v once i turn the key.
Not sure if it matters but a few weeks ago I had to rewire the ignition switch, could this be the cause?
Help please,
Thanks
el__burro
hairygit:
Try cleaning and tightening the battery leads at the battery end and the solenoid ends, and be certain that the frame is rust and paint free where the earth lead attaches.
hairygit:
If the vo;ltage drops that low, try jump leads from a car battery, you could have a duff cell on the battery. If it works, you need a new battery
El__burro:
Thanks,
tried both, but still no success.
El__burro
hairygit:
Have you tried shorting the terminals of the solenoid together and see if it turns over? If that doesn't do it, time to take the starter motor off and bench test it with a known good battery, luckily an easy job to do.
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