Join Date: Jan 2009
Location: San Diego
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My '03 is misfiring! Potential cylinder head problem?
Hello everyone, as the title says my '03 is misfiring. 2nd owner. Bike has 12k miles (11k of those miles being mine), with routine maintenance.
I was riding it the other day and about 3 blocks from my house it begins to misfire. Not just a little, but as if one of the cylinder's wasn't firing at all. Coast my bike back home (luckily I was up hill and my house was at the base) and decide to check for fouled plugs .
I get down and dirty, remove fairings, remove radiator from mounts...and what do I see? One of my coil pack's is sticking out of the cylinder head as if it were pushed out or knocked loose. Tell myself that isn't right, proceed to remove said coil and plug and check the plug. Plug is still good.
I then try to put the plug back in place....it falls right in place.....no threads catching....no resistance....just sitting where it should be seated and keeps spinning as I try to tighten it.
So basically the only conclusion(s) I can come up with is either A) my threads got jacked up (but I can feel the threads touching) or B) somehow cracked the cylinder head at that exact location causing the spark plug threads to no longer 'catch' because the seat is wider.
Before I start ripping my engine apart, I wanted to get your opinion about the potential problem.
AND if it is the cylinder head, on a difficulty scale of 1-10 how hard is it to remove from the bike to check? I read a previous post about the cylinder head and I think it said I could remove the cylinder head w/o actually removing the engine, is that true? I'm pretty familiar with car engines, have more or less rebuilt 2...but this would be my first bike engine to tackle.
Thanks for the help!