My friends are 2-stroke ATV nuts. Most of them run well and seem to run forever, until you start modifying them. Remove the airbox, aftermarket pipe, larger carbs, etc etc - they all push the bike to it's limits and make it easier for something to go wrong.
that's exactly what I'm talking about, more mods = more problems, poor maintenance and mixing chain saw or regular motor oil are also issues. To be fair, I know plenty of people who blow up 4-strokes too
The problem is...when you start messing with the suck/squeeze/bang/blow of the engine (airbox, less restrictive exhaust) you change the stoichiometric mixture of fuel to air...it makes the engine "lean" out and run MUCH hotter, heat + aircooled 2 stroke = bad juju! It's actually just a tiny bit better to run a 2 stroker a wee bit rich, this way even if its wasting fuel...it ain't burning up the piston or scoring the cylinders.
WOW...that little madass is coolhttp://www.moto-scoot.net/sachs_madass_125.php
It only has 13hp less than my 650cc V-star 650, and at $2500 that's not bad! However my fat butt on the thing...I would get MAYBE 20mph out of it...haha