Originally Posted by
freestyles
What's this pinch test i have been hearing alot about lately and how do you do it correctly. I've heard a few different ways of doing it and i want to find out which way is right.
Cheers
If you're referring to test the bottom end (low speed needle tuning), you pinch the fuel line while idle, and count how many seconds it takes for the engine to die out. If it dies immediately low end is too lean, if it doesn't effect the engine for a while, it's too rich. If the engine revs up and dies all within a 4-6 second range, you're close on getting a rough tune for bottom end.