250ex HELP

[blaster laster]

I have a 2004 honda trx250ex. It ran really good didn't smoke. The guy that had it before me put a fmf slip on on it and didn't jet it. So I Jetted it and was still fine just idled a little high. Today I changed the oil in it cleaned the air filter and stuff like that. I tried riding it a couple hours later and it was smoking like a 2 stroke when I was just revving it a little in neutral or would get on it very hard at all while driving. I have no idea how just changing the oil would affect it. If you can help me in any way I would really appreciate it thanks.

[powerbomb400]

Are you sure it isn't running alittle rich. What kind of foam oil did you use on the filter?

[blaster laster]

I didn't use any on it. I sold it a week ago because I couldn't figure out why it was smoking. Thanks for the help any way.