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It performs well under load, I was mainly concerned with this whirling noise(kinda hard to hear) and the popping noises (which I'm pretty sure is normal for a two-stroke bike, as I said I've never really heard one). Also all of the sudden the engine keeps revving into the redline all of the sudden while idling and I have to kill it.
There are many great mechanical gurus on this site and I am certainly not one of them BUT..... The reving sounds like a crank seal leaking. I know this from direct experience. When they do that they allow air into the crank case creating a lean condition which revs the motor. The parts are cheap and it’s a good afternoon’s work to replace both but not un-doable for a beginner.
Its either starving for fuel or has an air leak. Is the tank clean and is the petcock been cleaned out and flowing freely. I just did a 400 of the same year and the base gasket at the front under the pipe exit was leaking and causing overrev. These bikes run pretty smoothly when you get everything right
The following user(s) Liked this Post: Badger52, kakon864
I cleaned the tank prior to starting the first time and fuel flows good. I think i'm gonna buy a full gasket/seal kit. It comes with the base gasket, so mine as well replace it if i have it. Also gonna replace the crank seals, since it's cheap.