okay so i went ice racing this weekend on my kfx it has a pipe jetkit and no airbox direct filter clampted to the carb saturday it ran mint although i was driving it pretty hard trying to hang with the 450's sunday raced both my heats nothing wrong then my first race came up and 3 laps into it it started spiting and sputtering then died i turned it to reserve it started right back up i finished my lap and the race was over 5min later i went up for my next race i made it a half a lap and it spuddered out and the tires locked i got pulled off the track and was trying to compression start it and the tires kept locking up even in third..... now hears what i know the sparkplug looked perfect even sunday morning it was full on oil and coolent and came off the track not very hot..... i hit the start button and all it does is click i am thinking i broke a timing chain cause i was running it hard but my timing chain is less then a year old what else could have happend i am also thinking the piston seized but being it was full on oil and it wasn't very hot and i dont think i was running lean

 

any help or suggestions would be great

 

I really couldn't tell you.

You might have to break it down to see what the culprit is.

 

Was this thing makeing any funny noises. I got one tore all apart in my shop right now, it did the same and it stuck the rod bearing on the crank.

 

sounds like a bearing to me. and the only way to tell is remove the head and the jug
or something let go in the transmission. hope its not to costly to repair

 

you could have broken, a bearing because if it siezed, the piston wouldnt turn over. I sould say to take off the side covers before you pull the head