I'm also a die hard 2-stroke fan. I have a seriously modified 00' YZ 125 set up for the woods and believe me its alot of fun. 2 strokes are usually a little lighter then 4's and will handle a little better in the tight stuff. They can be tricky in the woods, trying to keep the rpm's up requires a slightly more aggressive riding style where the 4's have more tractable power down low and a smoother power delivery and require a little less effort to stay in the meat of the power band. Todays 4 strokes have come a long way and are excellent trail and moto-x bikes requiring less maintenance then the 2 strokes. If you're going to be in the mountains i would go with the YZ 250f. You will appreciate the extra torque a 4 stroke has when your climbing.
Danny
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01'RAM 1500 QC 4X4 5.9, 00' Mopar PCM,52mm Fastman T/B, K/NGen 2, Flow Tech Headers, Magnaflow Exhaust, Accell Cap Rotor, MSD Ignition-8.5mmWires,180*TStat, SkyJacker Hydros & Dual Stabilizers, 2"Daystars, Westin Nerf Bars, D/T-Trac Bar, Eagle Alloy 184's
04' GMC Sierra 1500 QC Z71 Off Road 5.3
99' Durango SLT 4x4
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