i have a 2000 blaster that i cannot get running properly. it'll start just starts running like crap and smoking badly when it gets warmed up. it won't tach out either. well i have a yz 250 donor bike I'm thinking about buying for 600 bucks, and I'm just wondering how much work it would really be.. i can do the simple cut and weld, but are there parts that i would have to buy such as exhaust?