Need advice on TTR 250 Problem

I have a 1997 TTR250 that I purchased a year ago. It ran fine but the last
time I took it out it began to give me the following problem. It starts and
idles just fine, but as soon as I open up the throttle more that 1/3 or 1/2 of
the way, the bike sputters and dies on me. Every time I get into the upper
RPM's, whether I am riding it or not. I have also noticed some black suit
around the back of my FMF Megamax II Spark arrestor where I had none before. I
have tried it with and without the QuiteCore insert, and I have taken out the
carb and looked it over. I am no mechanic but it seems pretty clean to me. I
noticed nothing out of the ordinary. Has anyone else had a similar problem? I
need to know what step to take next. Thanks for any help!

Frank

Clean Main Jet
Dave.


--
Ride like they are TRYING to hit you
<a style='text-decoration: underline;' href="http://profiles.yahoo.com/whiteknight32_1967" target="_blank">http://profiles.yahoo.com/whiteknight32_1967</a>
1991 CR500R
1979 XS Eleven
1973 GT750 waterbuffallo (two stroke)
1990 CR125r
1982 XR100



"FCouto" <fcouto RemoveThis @aol.com> wrote in message
news:20031130185613.20421.00001318@mb-m04.aol.com...
 > I have a 1997 TTR250 that I purchased a year ago. It ran fine but the
last
 > time I took it out it began to give me the following problem. It starts
and
 > idles just fine, but as soon as I open up the throttle more that 1/3 or
1/2 of
 > the way, the bike sputters and dies on me. Every time I get into the
upper
 > RPM's, whether I am riding it or not. I have also noticed some black suit
 > around the back of my FMF Megamax II Spark arrestor where I had none
before. I
 > have tried it with and without the QuiteCore insert, and I have taken out
the
 > carb and looked it over. I am no mechanic but it seems pretty clean to
me. I
 > noticed nothing out of the ordinary. Has anyone else had a similar
problem? I
 > need to know what step to take next. Thanks for any help!
 >
 > Frank<!-- ~MESSAGE_AFTER~ -->