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Hey guys I have a 2004 450r that sputters after about 30 min of riding (I haven’t ridden it hard). Recently I got the motor and carb rebuilt. The shop adjusted the carb so I’m doubting it’s the carb. The bike is stock besides a sparks exhaust. I have the air box lid on and a breather hose on the fuel cap. It runs perfect at first but acts up after about 30 min. Thanks in advance
 

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Next time it happens, open the fuel cap. If you hear a hissing sound or if it starts running ok
again, your tank vent is blocked.

Mad
 
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