I'm going to guess that by "tuning you mixture" your talking about the mixture screws on the front of the carb. These will only adjust the Idle mixture.

Changes for anything off idle will have to be accomplished by jet and or step rod changes depending on the carb type. Also the rate that the enrichment circuits open can be tuned by power valve/step rod spring changes.

The first step should be to determine if the carb is functioning properly, that there are no vacume leaks and no flooding over. This should be followed by insuring the iginition is also operating properly, (no fouled plugs or bad plug wires.

Unless you have access to dyno and exhaust gas analyser the next best way to determine if the carb neds changes are reading the plugs. Check the net and you should be able to find some good references as to what lean/rich plugs look like.



First you have to determine which RPM range