Well, my jetting is a 290 main. I run FMF pipes and had a 300 in a couple of weeks ago because it was a little over 30 degrees. I went down to a 290 when the temp came to about 45. Plugs seem nice and brown, almost like a coccoa powder color. I have the stock airbox on and am running a kn with the pro flow adapter. I definately need to replace the box and the boots that go on the carb because they aren't fitting very tightly anymore. Oh, my elevation is 800 feet according to google. Can I get away with just replacing my rings for the time being because I am on a waiting list with Jim at passion racing for an MX port, cool head and new top end. Also any word on the axle issue I mentioned earlier? Thanks a lot for the help.
Last but not least, what kind of oil in the spark plug holes to see if it is bad rings?