Bike not running right

blaster yamaha

New Member
Jun 9, 2013
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ok I am new to this whole forum thing but have been riding bikes for a wile but am still learning the ropes and need a lil help I have a 2000 Yamaha blaster recently rebuilt bored over .20 stock carbs and everything else is stock but reeds. I run drag races almost every weekend I put a rdz drag pipe on my bike the problem is that when I put the stock pipes back on and my air box the bike only wants to run strong in first and second gear after that it spits and sputters but if I take the air box off to just the carb it will run fine do u have a idea wat this could be thanks