350x engine trouble
 

Hello I have a 1985 Honda ATC 350X. The other day I was out riding and I went to go up this hill climb and rolled over. idiot i know. fliped back on the wheels started up after a couple of kicks and drove about 10 feet and the motor just shut off. Tried to kick and it was locked tight. My buddy me out to the street and we tried catching it in gear just drug the tires. If anyone knows what the problem might be please help me. Im pretty mechanically incline but this has me stumped because there were no warning sighns of it having problems.

350x engine trouble
 

Sounds like an engine tear down to me. If it froze up it could be many things. Crank, piston, cam the possibilites are endless. You wont know until you tear her apart.

350x engine trouble
 

pull the plug out, and check for any signs of damage.
pull the valve covers off and look for damage.
Can you put it in nuetral and the trans rolls free?

350x engine trouble
 

the transmission turns free in neutral or with the clutch pulled in.

350x engine trouble
 

It sounds like something in the top end is locked up. I wonder if your oil pump/oil cooler could have clogged up or messed up not feeding the top end with enough or any oil. Thats the first things i would check to see if anything is messed up and if it is you prob will have to rebuild anything that it could have messed up. I would say that if that is what had happend then your cam is locked. I think that the piston gets its oil from the bottom end and the top end gets its lube from the oil pump. Thats my $.02

350x engine trouble
 

does it still have oil in it?
how long was it running upside down??could be crank berrings
did it smoke alot when he started it???
all the oil would run to the head and away from the crank

Same problem with mine right now.