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Stutter at Full Speed WOT

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Today while driving on the freeway I was cruising at 80mph and whenever I would open the throttle all the way up, the bike would surge a couple times until i backed off the throttle a little. Would this be a jetting issue? it was about 80 degrees outside and ive never noticed it before. I usually ride that quick on the freeway when its cooler outside/ spring.  When I was going 50mph I decided to open the throttle all the way and it didnt surge or anything. Only occurred when I was hitting speeds close to 90mph. It does have a FCR-MX carb installed. Just wondering if anyone else has had this issue or any idea what it could be. 

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Will do, tomorrow ill take it to work and try that. I assume if it fixes itself with the petcock on prime then its a common problem? 

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It would mean that the diaphragm system in the petcock is acting up. If there is no change, look further into why there is a fuel restriction.

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