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Join Date: Sep 2011
Vacuum Leaks - Seek & Find Tips
While working on my '85 Vulcan 750 i suspected i had a vacumm leak between the carbs and the head intakes. I remembered a trick an old car mechanic showed me years ago on how to find these leaks on a car engine or motorycycle engines.
Find one of those small portable propane bottles everyone keeps around or get one from your local hardware dealer. I usually just turn the valve on the small propane bottle and let the gas flow. NO striker or cig ligter needed. With the enigne running as close to idle as one can get it to, place the nozzle end of the propane bottle around clamped off hoses or any where you suspect there might be an intake leak. If you come upon a leak the engine rpm will increase thus telling you that this is the location of an vac leak. Hope this is helpful!