SOHC.co.uk Forums > CB750
Running rich
Yoshi823:
If #1 & #2 are wetting the plugs, I would be inclined to look at the points gap & timing. It may be that the points have closed up & the plugs arn't producing a spark. As the carbs are more difficult to access, check the ignition first...with a timing light preferably.
bluemouse1006:
Hi
been reading this and have similar problem the plugs are like a black burnt biscuit wonder if anyone knows which way to turn the mixture screws to weaken off a touch ? it doesn't like running on choke at all so have to take it off as soon as it starts
cheers
Amos ;D
mick:
If I remember right Amos its in to make it richer & out to make it weaker ;) cheers Mick.
adrian58:
Ok checked float heights and if anything a bit low. Looked at all 4 plugs and Nos 1+2 showing sooty and a bit wet 2+3 pretty much ok. I'm now thinking have I got an intermittent/ weak spark as 1+2 share the same coil ? If I'm right, maybe that could also be the reason she's a bugger to start sometimes. It's on a Boyer so no points etc and all the plugs are new. Any thoughts help much appreciated . ps wouldn't start today then stripped 6 teeth of the starter reduction gear. Grrrrrrrrrrrrrrrrrrrrrrrrr >:(
hairygit:
Almost certainly NOT ignition related, 1and 4 share the same coil, 2 and 3 share a coil, so if 1 and 2 are sooting up, it's fuel related :(
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