Hey guys new to the forums but I've been using it for a while. OK I'll get to it.. Ive been slaving on my bike for a few days now, won't start and wouldnt kick down all the way (fixed the kicking)and clutch won't disengage fully. Bike sat for a year befor this, so first I fixed the timing, it was off by a tooth, this allowed me to kick without it locking up (timing was off because the bike slipped well it was on and hit a hard surface and skipped a tooth) , I also changed the oil and filter. Well it still wouldn't start.. so next I replaced the spark plug. Still wont start, unplugged the kill switch and now atleast i get a back fire everyonce and a while. so then i tore everything off the bike except the engine and took the carborator off , disassembled it and cleaned it. Put it back on and I've reused the fresh oil I put in. Still will not start.. now I'm back to checking the timing. Drained oil and took the left side cover off the top cover off and the spark plug out with oil pan underneath. I think the cams are off the marks on the timing sprockets.. well get to that later.. problem is I looked into my oil pan and found an o ring!!! I don't know what it's from. This pan is only being utilised this time around. I haven't used it the other times I drained the oil. (I did use it on another motorcycle that I just changed oil on) well I'm scared it might be from this bike but I have no idea where to look. It's about the size of the threads of a spark plug( the wider side that sparks). Outer diameter is about 11 mm inner is about 8 mm. any idea?