cu carb

[Charles Levien]

You will need to provide a lot more information to obtain and answer which is relevant to your situation, if you have a standard unmodified engine the carb you have is too big and will never provide optimum performance.

If your engine is moderately tuned you could start with a no.6 needle and blue spring. It may be on the rich side but it’s what I use and seems to give a good performance.