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Classic, Vintage & Veteran For Coventry and Meriden Models. Anything pre-Hinckley goes.

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Old 11-05-2012, 10:57 AM   #1 (permalink)
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Idling Issue/Stalls when rolling...

My carbs are old...but dont have the money to replace them just yet.
When I am coming to a stop fairly quickly, Ill have the clutch in downshifting and throttle released and before you know it - the bike has stalled while im still rolling to my stop...fortunately I can bump it at that point if i have enough distance in front of me before the red light/stop sign/car etc.
It seems as though the rpms are dipping really low when i release the throttle coming from 4k/5k abruptly...
this wont happen ALL the time, but enough that I am always weary of trying not keep the throttle partially open while downshifting and hand/foot braking simultaneously - which is a lot to do and not much fun!
Ive adjusted the idle up a tad on the carbs but it doesnt seem to be helping with this phenomenon.
Help? thanks!

Last edited by Issara; 11-05-2012 at 11:03 AM.
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Old 11-05-2012, 11:05 AM   #2 (permalink)
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I'd start with checking for vacuum leaks and/or plugged pilot jets.
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Old 11-05-2012, 07:59 PM   #3 (permalink)
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Clear the pilot jets first.Take out the air screws and see how far you can push a small wire,no bigger than 0.016" diameter,into the carb body.It should go in at least 1-1/2",if the jet isn't blocked. A 0.026" wire or number 78 drill or 0.4 mm drill should go in that far.

Then check the 2 idle discharge holes near the front lower edge of each slide.If you blow WD-40 from the idle air channel at the side of the carb mouth (take off the air filter to see it),it should come out those 2 holes when the air screw is open about 1-1/2 turns from bottomed.

If all that is clear and it still doesn't idle well with the mixture screws approx 1-1/2 turns from bottomed,look in the float bowls next.The surface may not be flat enough to seal at the gasket,so it sucks air and less idle fuel.The float level/fuel height in the bowl could also be wrong,especially if you have brass float needles.
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