SOHC.co.uk Forums > CB750
re-jetting needed?
El__burro:
I have lowered the clip so the needle lets in more fuel, unscrewed the air fuel mix until the plugs were not wet, started the engine, in neutral.. low revs sounds ok, high revs struggles to go.
Then put first gear in to go but it's a struggle.
Not sure about my strobo light, I'll try timing with the static method.
Thanks
el__burro
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Greebo:
it should be getting enough petrol through now, I suppose it could be electrical, but the timing would have to be a mile out to make a big difference. what about the coils ? have you checked them or the HT leads ?
what you described earlier was just how mine was on the first few runs after the build & we were not sure what is was at first, but on one run whilst opening the throttle it started the usual jerking & missing so I decided to pull out the choke whilst riding it, as soon as pulled the choke out it pulled away as it should, no missing or jerking, that's when I knew it was lacking fuel when on the throttle, adjusting the needles did the trick
El__burro:
I have static timed it, pulled the needle all the way up, checked the points gap, reser the bowls so they are even, cleaned the plugs, coils ok... still struggling.
I'll try pulling the choke on my next ride.
Thanks
el__burro
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totty:
"strobo light doesn't pick any pulse on cylinder 1
Plug one gets quite carbon fouled but the rest look ok."
I'd sort this first. Sounds like you've got a plug, cap, or lead problem.
After that get the main jets right for full throttle, leave the needles alone until the main is sorted. You will need a range of jets in order to find the correct one, you can't tell if you're got it near ideal or not in just one step, you have to see the effect of going a step or two either direction.
El__burro:
I have checked it all... spark plug, gap, still 1 and 4 very carbon dry.
Dropped the needle on the 3rd hoping to get better results but... no.
When i rev i have black smoke coming from exhaust 1-2.
Going crazy.
el__burro
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