don't worry, it's normal. you won't actually be running at 30:1, an engine won't run at that. on overrun with the throttle closed you max out the idle circuit, it'll go deliberatly lean, there's no point in putting fuel in if the engine isn't being asked to work. a lean AFR on ovverun won't damage anything.Originally Posted by rs250nut
Im not 100% sure on a.c or main but I have just drilled the second stage to 1.2. Boost is set at 20psi for the moment
The car does not seem to want to idle now either, do I adjust the idle screw to suit or is there another way I can sort this?
thats a seperate issue then. it might also pop on overrun too then.
likely causes are blocked idle jet (common if you've had the carb apart), missing or poor adjusted idle screw or an air leak below the throttle.
Real loud pops and bangs on the over run, its weird because before I drilled the second stage bush it idled sweet at a 950 bang on. I only removed the three screws needed to get at the bush.
You'd be amazed how the smallest bits can block up the idle jet. I had to blown mine through so many times when I did my old 11.
as I say, clean the idle jet
when you take the carb apart you disturb tiny particles of crap that otherwise would sit there minding their own business. since the idle jet is only 0.4mm it's the first thing to block and cause those symptoms.
I dont have a compressor in the garage but i do have a can of carb cleaner.
use a single bristle on a wire brush with some carb cleaner, that'll do it.
lol your mouth will do mate! Unscrew it, CAREFULLY remove the torpedo and give it a good blow.
On a serious note chaps this has been the best 20 odd nicker I have ever spent, If I were a member of this site back in 2000 when I brought my first five I could have saved myself a whole heap of money.
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