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CB750 Barn find project - First Timer
Rob62:
Great job UD!.... all your hard work and problem solving paid off in the end.... enjoy the indian summer :)
Underdog1:
--- Quote from: Underdog1 on September 09, 2018, 09:04:43 AM ---Finally going to have some fettling time today so going to sort the petcock and carbs.
Running on the rich side so need to raise the needle clip either 1 or 2 notches. How long do I need to run the bike for before looking at plug colour again to see if I need to move needle position again? And do I need to clean up the plugs if they’re already a bit blackened from rich running or does this get burnt off?
--- End quote ---
I raised the needle clip one position and didn’t really see a difference. Today I changed the main jets from #120 down to #110 leaving the needle position the same, was hoping to see a difference either good or bad but literally feels exactly the same with the flat spot at 3.5-4krpm. As I’ve said before I appreciate with pods it will never run as well as with an air box but I thought I would at least feel the difference of a significant change in jetting?
K2-K6:
It's more or less the transition point (under light throttle opening) of the idle circuit going fully to main jet running. Because the mods make the vacuum gradient go a bit chunky then it's this bit that is hard to define regarding jetting and making decisions about it. It will be hard to decipher so needs alot of trial and error to get improvements.
Could start as it is by trying it with the idle screws turned in 1/2 turn to see what it does. Then do the opposite, 1/2 turn out and try it to see what you can feel when riding. That's both from the original idle screw start point, 1 turn out? Ish?
Make sure the plug gaps are very concise on their minimum gap, which plug's are you running?
Laverda Dave:
Great Job and nice looking shortie exhaust. Now you've completed your first bike you've probably been bitten by the bug :). I agree with Nigel, always turn the fuel off before you finish your ride to stop the incontinent carbs dribbling!
MarkCR750:
Great looking machine UD, well done, pound to a penny it’s the pods causing the stumble, stick some velocity stacks on it.
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