Hi I'm trying to get an old RT100 engine running right for the offspring. When I start it the revs are kinda slow to climb and very slow to drop and I'm wondering where to look for the cause. The air box is missing and I'm guessing it was never re-jetted but other than that everything looks ok. Bore is brand new and no missing/leaky cylinder gaskets. Oh and the clutch is stuck so I haven't tried riding it yet. So.. How to go about troubleshooting this monster? I've never come across this slow dropping revs thing before. Thanks, Jon.