if carbs are worn, have them profesionally cleaned (you can do it yourself by dipping a day in CHEM DIP carburetor cleaner, of course you will need to disasemble ALL the carb and there are a lot of very small o rings take note where are they located, usually under a small washer thats been pressed by a spring and a setscrew)
have new set of needle jets, and main jets (two numbers LEANER!!) Also buy an instrument that called a unisyn,
when reasembly try that all carbs open EXACTLY at same time, all air jets should be opened 1 1/2 turns from closed.
when starting, try to set a medium iddle, engine hot, use the unisyn, and try to sinch all the carbs the same.
lower iddle further, and turn iddle air screw one cyl at a time, 1/8 turn each time, opening or closing, you should hear engine changing tone (IS NOT INMEDIATE and takes up to 30 seconds to tell the difference) until satisfied with THAT CYLINDER, go to the next cyl... until you have all four, by then the iddle is possible to have risen slightly... lower it again and do the air screw procedure again but with 1/16 turn or less each cyl.
dont forget to clean the tank and tank strainer!
