jetting problem or bad crank seals :s ?

[JohnBeton]

Hello,

This sunday I took out my trx250r for a ride, it has been sitting in the garage for about 6 months, so it was about time.
I used fresh fuel and oil.

But when it was running idle it sounded like idle was going up a little bit.
When I was riding it in the lower rpm it looked like it was way to rich and was stuttering, and in the higher rpm it rode fine.

But I noticed when I was riding in higher rpm and then let off the throttle, it was lowering the rpm but sometimes a stroke went higher. I don't know how to explain it.

But it sounds like when you have a bad crankseal.
But I changed those a couple of months ago and didn't ride it anymore since then.

The carburator looks clean. But maybe I'm overlooking something ?

Oh yeah, I checked the sparkplug, it was dark brown, and the center was almost black. So that indicates a rich mixture, but I wonder how it comes he sounds like sucking air ?

[Honda 250r 001]

the pilot sounds lean to me. Was it a different season when you last rode it? it revs a little higher and acts weird on idle correct? thats what your trying to say?

[JohnBeton]

yes that is what I tried to say :) It sounds weird on idle, and when I let go the trottle at higher rpm and slow down.
Last time, it was colder than it was now, so it should be richer now than last time.

[Honda 250r 001]

try messing with the pilot, i know thats the problem

[JohnBeton]

thanks, i will do that and post a reply of what came out of it.

[Aceman]

Everytime I've experienced a "hanging" idle it was due to an air leak or a lean condition. A leakdown test would be a great first step but you could fiddle with your jetting and see how it plays out too.