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Old 05-23-2011, 11:13 PM   #1
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Join Date: May 2011
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'07 gsxr 750

07 gsxr 750 sputtering

accelerating in 1st gear i can get up to about 4k rpms then the whole bike sputters and shakes, wont go any higher. shift to 2nd, does the same thing. 3-6th theres not a problem. it only happens when the bikes cold. If i let it idle and rev it a few times before i take off it runs like a champ. I ride it every day. just put a slip-on on the bike, set valve motor and cables have been removed from the FI code popping up a while back. Someone mentioned that with the set valve off and aftermarket exhaust its not getting enough back pressure to run right. any advice would be appreciated, wondering if i need to tune it or something so im not killing the engine.
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Old 05-24-2011, 11:43 AM   #2
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sounds like you need to just let it warm up a bit before taking off then
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Old 05-24-2011, 01:03 PM   #3
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lack of backpressure from a slip on will not cause it to do what you are describing. removing the set valve without pulling the control wire will.

invest in a tuning device, remove the set valve properly, and let the bike warm up at least a little before riding.

google the proper removal process, or PM me if you cant find it.
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Old 05-24-2011, 01:06 PM   #4
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08 Busa
03 XR 50

PC on it? If so I would disconnect it and see if problem goes away.
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