SOHC.co.uk Forums > CB750

First ride misery.

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Graeme77:
Yeah, the 116 are a bit rich, but the smallest i have. It did run ok with these though.

Im not bothered about it being a bit rich at the moment, im more concerned why it used to idle and now it wont even think about running under 2000rpm.

Graeme77:
I think it might be a float issue.

Ive just checked everything agian  ::)

All is good, but it just dumped some fuel out of the carb drain unexpectedly. There is also fuel in the carb mouths when i take the filter off.

The float heights are set to 26mm and ive checked them with a bit of clear tube on an old drain screw. Levels are all the same, fuel level is around 6mm below the top of the bowl.

I think ill drop the fuel height and see what happens.

Graeme77:
Im begining to think this must be an ignition issue.

A quick look on the boyer site shows a fault finding page.

This is what mines doing...

The Engine Runs Fast At Idle, Kicks Back on Starting
Poor fuse connection or wiring running low or variable voltage to the ignition.  As the alternator charges into the system with increasing speed the problem can clear.

So, not really sure how i go about diagnosing this, i guess i just need to check over the whole electric system.

Graeme77:
Checked everything over, all is fine. I did make the kill switch work again though, it had been badly bypassed.

Still the same though, i think my ignition box may be fubard.

Im sure this is the problem, its not carbs, its displaying symptoms boyer themselves say are possible, but all the electrics are fine.
Seems like the only conclusion is a fried ignition box.


I have a couple of points ignition sets, but im missing some of the advancer mech. I have the advancer plate thing, and the cam, i just dont have whatever springs and bob weights are in there.

Anyone have any spares?

Bryanj:
Check it with a FULLY charged battery, see if the charging circuit is working properly

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