i just built this 421 cub, new everything, got it all together, it kicks and fires right up for a split second, ive tried evry advice ive gotten from members on here idk wats wrong idk if its the harness or this dynatech cdi box, i know its not the carbs or the gaps ive cheked all those...ive tried alot of stuff. fresh gas evrything... its so close to wanting to run but just dies so fast...any help would be great. ty.
421 cub 19cc domes
stock carbs for now
stock timing
t5s for now
....could it be something with the harness. it seems like timing but....its all stock.