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The KTM has been off the road for a little over a year. It has a Rekluse clutch which failed at Southwick last summer; the basket was torn to shreds and some clutch steels were warped to hell. So I parked it, bought a CRF250R and the KTM experienced some benign neglect.
I got the clutch done late last fall but the bodywork was a hot mess and the electrical system was worse. After doing the clutch, the idle was fine as I had to test the clutch engagement.
I didn't ride it last fall and left it in the garage this summer. I finally gave it some TLC by replacing the wiring harness and replacing the kill switch. I also cleaned the air filter and replaced the spark plug. I tried starting the bike today (first time since the fall) and when I start it the idle is sky-high. It doesn't have a tach but it sounds like it's absolutely screaming.
In all the time I've owned the bike, I've never touched the carb. It starts first or 2nd kick, so I've never needed to touch it, meaning I have no idea what the jetting is. I didn't touch the throttle assembly either.
Could this be as simple as a (big) air leak? I tried pulling the air adjustment screw out a couple of turns, that made no difference at all. The throttle opens and closes cleanly, so I don't think it's binding on anything. Is it worth disconnecting the throttle from the carb to make sure it's not being held open by something?
I know I need to add some more transmission oil but I can't imagine that's related...