1981 Express II na50
Posted: Thu Jan 23, 2025 9:56 pm
My case sounds familiar to other posts I've seen. I bought a 1981 Express II from my neighbor. The piston was frozen. It wouldn't turn at all. I removed the engine from the frame (amazingly easy) and started going to town. I think this thing was sitting in mud. There is so much filth and grime. Pulled the cylinder head off, with the help of a rubber mallet, broke the jug free. Still couldn't pull it off. After much penetrating oil and heat, I broke down and found a socket near the same size at the bore. I drove the piston down.
Now the bad news, I broke a couple bits of the piston off. I was planning on replacing that with rings anyway. I peered on the engine and it doesn't look pretty. Water must have gotten in the engine at some point. I'm debating if it's worth my time cleaning the old bits or sourcing replacements. The gear case is completely clean. I believe the moped all complete, with the exception of the rear fender and a few electrical pieces. I would load up a few photos, but the files are large. Also, I think I'm going to be running all new wiring. I'm going to have to figure out to incorporate the battery. I have a lot of work to do on this.
Now the bad news, I broke a couple bits of the piston off. I was planning on replacing that with rings anyway. I peered on the engine and it doesn't look pretty. Water must have gotten in the engine at some point. I'm debating if it's worth my time cleaning the old bits or sourcing replacements. The gear case is completely clean. I believe the moped all complete, with the exception of the rear fender and a few electrical pieces. I would load up a few photos, but the files are large. Also, I think I'm going to be running all new wiring. I'm going to have to figure out to incorporate the battery. I have a lot of work to do on this.