I have been going over the tls this winter and tried starting the thing with the crankcase breather hose kinked. it idled like shizz and then backfired a couple of times. I turnd it off now its running on one cylinder. Maybe the cam timming some how???
Yea, I did the whole plug to frame test, observed spark, dried it, put it back in the cylinder, started the bike, took spark out again to see if fuel was getting to it. Seems to all check. but rear cylinder not firing.
The breather hose couldn't have altered cam timing. I would replace the plugs, testing it out of the engine doesn't prove much as sparking under atmospheric pressure is a very different thing from sparking under pressure.
Also check that the throttle bodies are still seated in their boots, a backfire can sometimes blow them out.
Fixed. I was going to spend some time inspecting the timing becuase I have had issues with it before. I think an important messege here is realized in the razor. Simplest petential problem first, then advance to more complex solutions. THANKS GUYS!!
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