Gyrobob
Serious Thumper
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Posers ain't motorcyclists
Posts: 2571
Newnan, GA
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bigdawg wrote on 06/23/13 at 15:11:05:I have a nother question. I put a vacuum gauge on the carb where the stock vacuum line was and the gauge bounces from 0 to about 18 when cranking is this normal? Put a very long length of vacuum line (5 feet? 10 feet?) on the vacuum port, and put a small c-clamp near the end of the line with vacuum gauge.
-- Use several feet of vacuum line because you want a lot of interior volume. Any kind of flexible hose that will fit the carb and your gauge will do.
-- Clamp the c-clamp down so the hose is blocked off,... then with the motor being cranked over by the starter motor, slowly open up the c-clamp bit by bit until there is a tiny "leak" in the hose at the clamp, then stop opening the clamp. You want the clamp to allow only a very little bit of air to pass.
The long hose (with its interior volume acting as a volumetric damper) and the very small amount of air allowed by the "leak" (acting as a flow restrictor) will cause the needle to be a lot steadier.
It may take several seconds of cranking to get the needle on the gauge to stabilize. It will still wiggle back and forth some, but the range of motion should be small. ("help" is not a very helpful title for a thread)
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