nice bikes, i had an 88 125 and 250 when i was younger, always liked them both. your 500 looks to be in good shape. i have oe barely used rear fender that would look much better back there.?
every 80's era kx anything i have owned has had pipe moount issues. even my 125's had trouble. a few 500's i once had were nothing but rattling messes, so this bike wanted to make sure it didn't happen. i have always liked the honda rear pipe mounts, so i added a few to this kx, as well as made a new upper. maybe this will give you an idea or something
welded tab to right front engine mount, tab on pipe, then rubber mounted the two together.
this is the stock location. somone had already made a new tab on frame. i made this from a cr125 head stay, think 5/16 thick. picture is hard to tell but the two are offset
this is on the rear of the chamber. i used to crack silencers, all kinds of wierd stuff. now i think everything will stay nice and rattle free, but still have give ifi t needs. still rubber mounted everywhere. those factory kawasaki pipe mounts never were a good idea.
here is how my 86 looked when i got it
picture does not do justice, this bike was ruined, besides making new engine mounts, i must have welded 4 or 5 cracks in the frame.
here is a link to some other stuff i have done so far
http://rides.webshots.com/album/576733989dbmoOX?vhost=rides