i rejeted and once i get it going after i fix the chain and replace the swing arm bearings i have to check and see it its lean or rich... but im woried that it will be to lean and ill melt it if im rideing for like 20 minets to cheack it????? what should i do... dshould i turn the screw out to make it richer so it would be richer so if it is to lean it wont be then i can rais it or lower it if i have to???