I believe its a 2000 rm 250. How do I tell for sure? My first dirtbike actually worth fixing lol. Anyway I bought this bike in a box lol put it all together new crank, piston, etc. My issue is runs great for about 15-20 minutes then it'll kinda bog down then die...pull the plug its black an soke and wet. Im running br8es plugs, 50:1 mixture, air mix jet from 1-2 full turns out..I believe when I had the carb apart jets were 165 and 40. Carb also has that power jet valve that connects into wire harness. .what am I missing here?? Any help very much appreciated!!