I would recommend talking to a good builder of 2 stroke engines. Got to a bike shop and hopefully there is someone kool and knowledgeable. Not all bikes shops have these people
They make test instruments, Race Air for example which reads the ambient atmosphere just for jetting purposes. You can go by correct elevation or air density for example. This tool is good for getting started. Basiscally you are trying to find out how dense the air is based on elevation, temp, humidity, ect.
You can also tune by ear but this takes experience. One thing I can tell you, is when running your engine at idle, and it wants to rev up by itself a little it is too lean. But still this takes experience to hear, feel and than tune by. You could run it than check the plug. Hope this helps |