Jetting For Cold Desert Riding

On my KDX I only ride So. Cal desert and it seems like the temperature in the afternoon can be up to 30 degrees warmer than when I first start riding in the AM. On my stock 200 I think a 158 main is still a little rich for 60F degree dry desert riding. Might be just right for lower temps, though. I personally wouldn't go back up to 160 from 155 without trying 158 first.

I'm using a 45 pilot. I'm not sure where Red Mountain is. Is it north of Lancaster? Maybe that's Red Rock Canyon I'm thinking if. Have only been there once, in '97. It was plenty cold in November of that year. Lot's of rocks, of course.

9 out of 10 times when we go to the desert it's Wild Wash off I-15 north of Victorville. All kinds of terrain: sandy washes, rocky hillclimbs, single track, long and fast telephone roads. Oh, and whoops, lots of whoops. Being near the interstate it has excellent cell phone coverage. Funny how that wasn't a factor where we went riding ten years ago before we got those stupid phones attached at the hip.

If your talking about Randsburg or Red Rock Canyon you'll be just fine with the OEM 160mj,48pj jetting. Your mileage will suck, 40mi tops from your tank but you'll be plenty safe for extended WOT.