im in texas going to colorado about 9000 feet with my 2008 trx-250 hondas do i need to re-jet my carbs been told different things i only have about 50 hours on each one.thx

 

I live in the valley near sea level, and that is what we jet for. (Sometimes we even ride at below sea level!) The mountain trailheads are at around 4,000', and from there we ride to over 11,000'....all in one days ride!

What we do is install a couple of Thunder TPI's in the airbox lid. As you ascend in altitude, you open it up to get more air, and as you descend, you close them back down to get less air. Above 9,000', I just pull the airbox lid off altogether. In a sense you are doing a rejet, but instead of adding less fuel, you are adding more air...end result is exactly the same....and a lot less trouble!!! http://www.thunderproducts.com/tpi_valve.htm

I noticed you mentioned the TRX250 (Recon or EX I presume???). On these, there isn't enough room in the lid for the TPI, so I just install a bunch of those UNI round vents. At sea level, they are taped over with duct tape, and as you ascend you start pulling the tape off to get more and more air. Not as convenient as the TPI, but it works. http://www.unifilter.com/onlin...alog/accessories.html

This system works great!!! No sense fooling around with a rejet and all that crap, unless you are going to move to high altitude permanently.