Kryten wrote: ↑Mon Jun 06, 2022 4:46 pm
A common problem. The powder coating blocks the little hole at the bottom of the fabrication at the back of the frame for the swinging arm and engine mounts. Water collects and the tin worm flourish.
See Drews Kat....
Drews Kat 1.jpg
not quite, the problem is that when frames are chemically dipped, it removes the paint from everywhere including inside this gusseted area, powedercoating covers the exposed metal but the inside of this gusseting is left as bare steel and then chemistry just does its stuff. bare steel, engine heat road salt and rain. and its eaten away from the inside.
another fault is caused when people lose or remove the plastic caps from the ends of the frame tubes near the tail light,water spray from the wheel gets inside the frame, runs down to the engine cradle and again, finds its way out.