Recently rescued a titled, running 1986 125M (has the wrong tank grrr) and I got it running and moving, I can get it up from neutral thru 1-2-3-4, and back down to neutral, but I cant get it into reverse and I'm not sure how. I dont see a lever or interlock anywhere, is there a special procedure? I haven't been able to even find a 1986 125M owners manual to read.