OK, who can tell me about the stock carb main jet holder adjustment? It is threaded so's you can move it up or down. Is this somehow related to needle adjustment or just main jet height in the carb? I'm not sure if mine's been screwed with from a previous owner or not. Is there a procedure for this setting?

 

this setting is very important. if you skrew this jet needle holder all the way in, you will be low on power. set the locking nut so that you can see 3-4 threads on the holder. if you don't understand or have other questions, let me know.