2003 R6 Firing Problem
My cousin bought a 2003 Yamaha R6 earlier this summer. Last week he told me it wasn't running right and wanted me to look at it. He brought it over on a trailer Monday and dropped it off. I started it and found that it was not running on all cylinders. A quick touch to the pipes confirmed that the number 2 cylinder was not firing but all the others were.
My first thoughts were spark plug or coil. It took almost 2 hours of labor (following the factory service manual) to get to the plugs. The seat, tank, airbox, intakes, and engine heat shield had to be removed. Below is a picture with everything except the heat shield removed.
I found what appears to be the problem. Each cylinder has its own coil. On the problem cylinder, there is a hole in the side of it where it looks like it shorted out. The hole through the rubber boot is charred looking.
My question is this...Did the coil fail on its own or is there an underlying issue?
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