I bought this old sled seized, for about $50. Everythig seemed to have been in good condition except a small rip in the seat and it sat for 10 years untouched. I unseized the motor myself and got it running again with new hoses, plugs and belt. I didnt trust the oil injection at first so I filled the oil tank and ran mixed gas in it aswell. After noticing the oil level o down from running it and making sure it wasnt leaking I was sure i was buring the oil. So when I went low on gas I filled it up with regular gas and topped off the oil tank. Ran it for a while no problem. Came back a week later started it up and it was smoked like crazy so I was sure it was getting plenty of oil. Ran it for maybe 10 minutes started sounding weird and shut off. Started it back up with a clatter in the engine and it wont run on idle. So I dragged it back to the garage and havent touched it sence. I assume the oil injector failed and it wasnt getting oil, but the lines are full and not leaking and the oil level went down. Or perhaps somethig broke loose in the motor but I've ran it for 100miles already so why now? The engine clatters and wont idle and im afraid to run it in this state. Can someone confirm its an no oil situation? Or have I already damaged the motor? I am new to this snowmobile stuff. Is it possible the oil is too heavy that I put in it. Is it possible to fix this? Thanks I'll take all the help I can get.