Hi Joe, The technical riding you described is the type of riding I like to do. Normally I ride this sort of terrain on my TRX450R, but at this point really want to focus on 2-Strokes and will probably sell the TRX450R if I can get the 89 TRX250R setup to work just as good or better than the 450R. BTW, I figured the Eliminator pipe was a better option for the Oregon dunes than in the woods. I assume the 39mm Carb will also need to be changed.
A flat slide card would give you a little better low/mid power & throttle response. 12/39 gearing also works well in the woods with a stock cylinder. Have you opened up the top end to see if it's been ported?
Thanks for the advice. Honestly I have never done any engine work and wouldn't know what a ported top end looks like. My 89 TRX250R has a Pro Design Cool Head, but I don't know what model dome it has.
To find out you just pop the dome out of the shell but you may need a head gasket depending on how it's setup.
Thanks... That makes sense. I was on the Pro Design web site and it looks like they have quite a few domes in different millimeters. I really have no idea what the different sizes do for power, etc. Taking a stab in the dark I would guess the lesser the millimeter the more power produced?
Lower dome cc= more compression, higher cc= less... If you pull the carb & reed cage off anytime soon, take a good picture of the intake opening & post it & we could tell you if it's been worked on or if it's a virgin.