Recently picked up a raptor 125 of craigslist for $1200 bucks. It's a 2011 so in my mind it was a good deal. First 2 weeks on the thing has great. Start's right up no problem and goes though all the gears. I did notice the machine did like to pour white smoke allot but im not sure if that is relevant to my problem. So the other day while out in a snow storm the machine simply started bogging down and stopped running and I cant start it since. The engine just cranks over and over and I don't get even the slightest sign off combustion. I did a very unscientific compression test with my thumb over the spark plug threads and noticed that the piston doesn't even have enough compression to push my thumb off the hole? Also it doesn't seem to be getting any fuel? The Plug is dry after cranking the motor trying to get it started.

Other things checked

1. Spark is Good
2. Carb is Clean
3. Valves were adjusted (in spec)
4. Doesn't Seem to Be getting Fuel/ Almost no compression?

Is it possible that the top end just needs a rebuild? aka no compression?

 

Yes, if there is no compression it won't suck fuel through. Why did it seize, short of oil?

 

Finally had the time to pull off the head today. Piston is SHOT and the rings are totally seized. Thanks for help all.

Pics Below. Guessing the previous owner didn't change oil frequently enough. : (

Time for a RE-BORE

http://imgur.com/a/bFaWh