New poster, from wintry south west Wales. We've just finished a full rebuild of my lads TY80 which took Dad rather a long time to complete (ahem). Anyway, it ran really well which was a relief, right up to the point where he toppled over on it and it ran for a few seconds on it left hand side. It didn't over rev just lay on it side at idle. While it was over and as I sorted the boy out, I heard what sounded like the chain trying to jump of the sprocket so quickly hit the kill button. The bike stopped as I hit the button but was now locked solid when in gear. I thought something had come adrift in the gearbox but now I've stripped it down, the problem is obvious. A small ring or washer looks like its found it's way into the crank case and jammed up the piston skirt followed swiftly by bits of skirt jammed against the flywheel and cases. Crank is out and all bearings seem OK, new piston and it should be fine, fingers crossed. I just can't figure out where the steel washer/ring thing has come from. I attach a pic for the more experienced engine fiddlers to hopefully identify the part!
http://i192.photobucket.com/albums/z6/gron...20Pics/FOD1.jpg
Thanks for any help guys,
Gronno