dingoe, Maybe I misread, but did you mention why you were not happy with your TE570? I've ridden Huskies forever, but they've always been two strokes. While riding in the California desserts I geared 15/48, but had a big bore 436 with six speed. When I moved to Hawaii I rode a 98'WR250, and had to gear it down 12/52, also a six speed. In six speeds the gears are different than five speeds - lower first, and of course extra gear on top. So, in the dessert I was able to gear really high because the first gear was so low to begin with. In Hawaii, very tight and nasty/slick terrain, gearing low gave me a first gear that would almost never stall - although I did have a healthy flywheel weight.
I would say no on the two stroke - and spend a little time and effort on your TE570. By the time I sold my 98'Husky I had invested well over ten thousand dollars - but it was perfect, and that was spent over four years. You've got a great bike, that is probably one of the top three bikes made for the dessert - I'm thinking Honda 650 and KTM-4s. Anyway, just my two cents.
ToddHawaii
TrailTramp