hey guys, ive been building a gx 440, its cammed with a fully built valve train, and a arc rod(stock length), and its port and polished, ive tried running the HR tillotson carb, but i keep blowing out diaphragms it seems, ive tried running mikuni slide carbs, and nothing seems to work... what are you guys running? or can get my HR built up from someone to make it work.. id love to use that HR but its no good if it wont hold up. and help is appreciated. Thanks in advance