SOHC.co.uk Forums > CB750
1978 CB750F2 - Poor Starting
royhall:
If its good when hot you have hit the sweet spot. Those carbs are a bit of a compromise in setup so most of us accept the cold running issues as part of getting the hot running spot on. Does that make sense. Rubbish lean burn carbs are the issue.
K2-K6:
Have you set the "fast idle" adjusting screw? As there is a routine for that which should hold the revs for you without having to play with the throttle.
The absolute peak rpm when on full choke is 3,500 rpm too, which with UK temperature is probably needed, not necessarily to run all the time at that, but more to set the relationship of ambient temp/ mixture/ engine warmth so that it works correctly.
royhall:
Got mine set to run 2800rpm maximum and works just fine. The setting keeps some fast idle with the choke just on but the butterflies open.
UK Pete:
Has anyone put the k series carbs on f2, that would be interesting if possible
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royhall:
K series carbs are different diameter and slightly different spacing. However, someone on the USA forum has achieved it. Can't find it now as it was a while ago and I'm not a member on there so can't search properly.
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