I guess all I'm saying is don't run your quad that lean if you're skeerd of something going to hell but from what I've seen it takes running VERY VERY lean to do something wrong to your motor. 4 strokes anyway.

 

count me as skeerd.

jbt

 

If your pipes are red, you are lean. On my 2001 the pipes were glowing red at one point, so I jetted a little fatter and the pipes haven't been red since. Everyone says that if your lean, the engine is hotter, right? So if your pipes are Red-Hot that means they are hottern than an ATV that is running without Red-Hot pipes. I've seen many people talk about plug reading and how fuels affect that these days - I dunno what is fact, I still check mine just to see. The only true way to find 'perfection' is the dyno - and re-dyno the ATV every time you make a major change. That is too much trouble for 99% of people (including me.) I think the previos discussion had a lot of validity, though I would strongly advise jetting up if your pipes are red-hot.

The other reason I'd say to jet up if you aren't sure is that running the engine a little rich wont cause much harm, however running it too lean can cause harm - it's just a matter of when and what happens. So if you're going to err, be on the side of caution, especially if you guys talk about having bad luck with things! (I had such bad luck with ATVs one weekend - I had two engines die in one weekend on two different machines! 1990 LT250R and 1987 Mojave) After that, I started buying DS650s and making sure I was always on the side of caution.