I’m currently rebuilding a Krendl 500 for some educational video work on retrofits I’ll be doing for CCHRC in AK this coming summer.  Working with Krendl in the lower 48 has been great.  Stellar tech support.  The issue, (as always) for us Alaskans, is that lots of distance, time and expense separates us from suppliers.  I can’t just drop this thing off one state over at a dealers.    
If anyone has a 500 I’d love to see some pictures of the drive chain and sprocket geometry.  The machine I have was reconfigured and some of the sprocket mounts were ground off and welded on to other locations.   Thanks  -Ilya