ok so awile ago i was having problems with my blaster i thought i heard a knocking at low rpm's but i wasent sure so i made a post about it and everyone told me i was problally running lean so i did a leak down test and didint find any leaks. and i took the head off and i looked at the piston and combustion chamberand cylinder walls, i didint find any prblems there either, the piston and cobustion chamber looked pretty clean there wasent much black build up on anything, and when i wiggled the piston back and forth there bearly any movement. so i then took my carb apart and checked the main jet and it was a 370! WAY to big for my mods. so what im asking is for my mods what jet should i put in i bought 270-300 jet sizes and the needle and eclip was set for the 370 jet so what jet should i put in and what else should i adjust to fit my mods?