Question on two identical ATVs, different performance?

[VortecYJ]

I am new to the ATV world, and I have two new 2004 Arctic Cat 650LE's that have had almost identical side-by-side use for the less than 60 miles we have on them. One of the ATV's will lift the front end off the ground simply by punching the throttle from a stop, and with a little feathering on the throttle will carry a wheelie for ~30' plus without much effort. The other ATV barely lifts the front end off the ground in the same situation.

Why the large disparity in two identical quads? Is it a belt adjustment or carb adjustment? We constantly mess with the idle adjustment on both to get them to start, as it has been cold here since we got them. I have not adjusted the suspension on either. What could be the cause?

[White7]

How about a side by side drag race? power the same there? How about in the high RPMs any sputtering?How about your air filter is one oiled ALOT more than the other?

Ive seen (from the factory) little pieces of crap in the carb plugging the main jet and also excess material blocking the intake(behind the filter)

Have you messed with the air fuel mixture screw? are they both the same? You might want to take a quick check of the main jet and make sure you have the right sizes in there

Power comes from sucking air in(fuel along the way) and blowin air out ,so thats where id start

while all machines are a little different it shouldnt be that drastic

[el ranger loco]

Stop screwing with stuff on a brand new quad! If you dont know how to make adjustments, take them both to a shop that specializes in your brand & have them jet it adjust them for the weather & altitiude. They should both be nearly identical unless you messed something up on the carb.