Inliners International Forums General Discussion Engines Single barrel carb question

ok well i may be ok on the vacuum at the top of the carb then. i just assumed it should have enough to suck your hand to the top of the carb.

i did check the vacuum with a gauge at the intake, and at idle it is around 12 but the needle is really bouncing back and forth between about 10 and 15 very quickly

i know that sounds a lot like a burnt valve issue but when i did a cylinder leak down test to check for that all cylinders were within about 5% of each other. so i am wondering where in the world could i be loosing that kind of vacuum. from what i have read i should have right around 20 lb at the manifold.

i have checked the intake/exhaust gasket by spraying carb cleaner all around the intake and exhaust while it was running and there was no noticeable leaks. i could have missed something in behind the exhaust pipe however.