Originally Posted by
jwm2
How hard would it be to change from long needle to a short needle on the carb? Is it as simple as removing the long needle and replacing it with a short needle? Also which short needle will work for the go engine .21's? Any help is appreciated.
Yep, it's that simple. GO make a short needle for their carb. Some countries import the motors with the short needle (USA) while most other importers opt for the original long needle. If you are in the US just order an LSN off one of the distributors - it will be a short needle. If outside the US contact your local distributor and ask for a 21-2003-A which is the short needle replacement.
You could also just cut down your long needle from 1.6" to 1.42" with a rounded end. It will work fine. Your carb will then tune like a Nova or any other carb. Ask back here for base settings if you change needles.