i have a 2006 400 fis 4x4 that has been running perfect since 2006. the other day during a ride it all of a sudden lost power and sounded like it was running out of gas. when i would give it throttle it would die. then i restarted it and it would run at idle, but as soon as i gave it throttle it would die. i thought it was a carb issue, so i bought a new carb and its still doing the same thing. if i hold my hand over the air intake end of the carb it runs at full throttle, if i take my hand away it will die. my friend says it lost compression and the motor is toast. what should the compression be? It seems odd it was running fine for years then within seconds its done. is this how engine blow? i never heard any strange noises or anything out of place. i ride this quad at 10-15 mph and change the oil regularly with synthetic oil. any ideas would be appreciated.