SOHC.co.uk Forums > CB750
Carb jet sizes
neat street:
Hi Mick
I have replaced all the jets (same as was on the carbs std setup) but plugs are coking up, it doesn't appear to be oily, new air filter etc, I also dropped the needle down one, when she runs, she runs well, but does hesitate a little in mid range (similar problem to Billy`s)
Sorry I haven't been on and replied earlier, working in Germany for a few days.
Many thanks
John
mick:
Hi John I've just had a similar thing with my bike, I have a F1 engine, carbs & airbox in my KO frame, running 4 into 4 pipes HM341'S, genuine Honda air filter,
my bike was stumbling and running rich, my needle clip was in the middle one and I raised the clip one notch lowering the needle and weakening it up ,
105 main jet and 40 pilot jet float height 26mm, it now runs a lot better 8), I did 100 miles on it today and its running the best it ever has no stumbling and
pulls like a train, ;) cheers Mick.
K2-K6:
John, have you got any current compression test readings to see what general engine health is like?
neat street:
Thanks for your reply's, I thought that raising the clip (lowering the needle) would make it richer? so I lowered it by one (from the centre), maybe I should re set to lower the needle and try that first? I haven't got a compression test kit at the mo, but maybe could borrow one and see how that goes as well. I have just put in some higher heat range plugs to see how they work. I will keep you posted, but may take a week or so to get back to you.
Thanks again for your help and advise, always appreciated.
John
neat street:
Thanks again, Odd job, I will check out the jets for the 500, but first will lift the clip up one above the centre and re balance the carbs before I change the jets
Thanks again to the knowledge you all pass on.
John
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