I got a deal on a 2001 scrambler 50 that needs some work. Right now it won’t start. At first it wouldn’t even fire and no pressure was coming out the exhaust. I was finally able to get it to fire for me and run for a second by disconnecting the exhaust pipe. It must be clogged? It will run for a few seconds every time it is turned over but dies out. I checked compression and it is about 120. It has good spark. It had mixed gas in it when I got it so I am assuming the oil pump wasn’t working. I took the carb apart and cleaned it out as best as I could. The carb was set at 1.5 turns and I put it back that way. Wondering if it might need to be rebuilt or if there is something else I can try. Also is it possible to clean out the exhaust pipe?