All of Justins responses are right on BUT keep one thing in mind, a engine is a engine is a engine, IF there's gas in the carbs and IF the pistons are in good shape and IF the valves are closing at the right time and IF your getting spark you gonna get a BANG, forget no air going into one cylinder, all that indicates is something is wrong with the engine so go back and check everything you did and find what you did wrong because you did do something wrong, the place that is the easiest to go wrong is the valves so check your valve timing, if a valve is open when it should be closed all that piston can do is go up and down, it can't suck in air and it can't compress the mixture, you have a choice, either go back and find what's wrong or let the bike set and wonder why it ain't working.
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