My buddies Raptor got sand in the motor. The carbs went and started pouring fuel out of the carbs. We switched over another set of good carbs and the bike won't start. It sounds free spinning. The compression is around 120-130psi and the timing is on. It also has spark. Any ideas of what to check or what could happen. Thanks.

 

uhh depending on how long that sand was in there...may just want to tear apart the entire motor and clean it all out and check EVERYTHING bad bearings arent something to ignore
i would atleast tear apart the head and check the valves, if everything checks out it sounds like its probally something stupid that needs attention

 

Did you pull the spark plug and see if it was actually turning? Could be the timing chain or one way bearing.... Just a thought bro.

 

That compression sounds way too low. I think its supposed to be at least in the 180 range on a stock setup.

 

ya. i think the motor is blown

 

How did he get sand in the motor? How much got in?

 

149 is the low end compression limit as per the manual. I would make sure the battery is charged and the throttle was wide open for the test.
Gary

 

Foam filter let sand through. Will check again with a battery charger on. Will do in couple hours.