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Old 11-20-2012, 05:49 AM   #1
Grad OP
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Joined: Dec 2004
Location: Athens, GA and Blairsville, GA
Oddometer: 2,228
What is causing this engine stumble? (video)

I have a 2007 Triumph Tiger with 15,500 miles on it. Under VERY light throttle above 4,000 rpms, the engine has a stumble to it. Under regular throttle it runs very strong and has no issues, but if I am coasting down a hill at 4500 rpms and barely have the throttle open, the bike will lurch like I have chopped the throttle off and back on. You can see evidence of it in this video:

http://youtu.be/uwrcT4Mn25A

I thought it was an ignition miss, but a mechanic I showed the video to thinks it is too "smooth" to be a miss, and more of a fueling issue. I believe the previous owner changed the plugs at 12,000 miles. I am just trying to narrow down the problem to see if I should order any parts before I tear into it (I live a ways from a dealer, so I am going to buy off Ebay and then resell the ones I don't need).

I would love to hear opinions from experienced mechanics.
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