A-men brother!
2 strokes are 130 for a new piston kit, only diffrence is a 4 stoke is 50$ more, but it lasts 3 years practically if you can shift it well. A 2 stroke runs best if you switch it every 1 year, so you do the math
250F-$180
250-$390
To see 2 smoke buried at the track-PRICELESS
hahaha sorry, had to add that last one. Personally I like all bikes, 4 strokes have been proven cheaper in my mind. Sure, you gotta pay for valves and springs but with proper care you can make them last too. So around $550 I think to rebuild the whole top end and valves if you do it yourself, but then again, by this time, your still under.