SOHC.co.uk Forums > CB750

Poor running below 300 rpm

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RGP750:
Hi All
Took the bike out last night for a 30 mile run, it hasn't been out since last year.
I had to run with varying amount of choke for first couple of miles and below 3000 rpm very "wooly"
not complete misfire but definitely not right.
When I hit 3000 rpm ish it kicks you in the back so my guess for what it's worth
is carbs.
Idle jets gummed up over winter??? when it gets to main jet ok???
If that's what it is best way to clear it without taking the carbs off.
Any ideas welcome please.
Cheers Rich

Greebo:
Sounds like the carbs need a good squirt of carb cleaner, hopefully that will do the trick

totty:
Drain the float bows, fill with redex via the fuel line, leave a few days turning over occasionally to draw a little through the jets.
I find it's worth a try before resorting to removing and stripping them, it tends to work if it hasn't been stood long, I've also stored bikes with carbs full of redex.

MarkCR750:
You could also try removing the air box a and squirting carb cleaner down the small brass balance pipes, may not work but it's quick so worth a try.

royhall:
Great idea with the Redex, will try that at some point. Got lucky with one of mine that had the same symptoms as yours, just kept running it. As long as petrol is getting through the idle jets in some amount it usually (but not always) clears with use. Like the idea of the Redex for winter storage though, does it really work.

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