Exhaust Flange for Honda GX390 Small Engine and clones

thingiverse

This is an exhaust flange for a Honda GX390 clone engine. It will fit most any common big-block Honda or clone small engine. It is for welding a custom exhaust system for a small engine powered go-kart or ATV. It will need to be cut out of steel plate so you can weld on your exhaust pipes. I needed one for a vintage ATV that I am rebuilding and to buy one costs about $10. I thought that was ridiculous for a small flat piece of metal, so I drew it and modeled it up to cut on our CNC plasma cutter at work. I work IT in a metal fab factory so I can have these cut out of scrap metal that would otherwise just go to the recycler. The thickness is not as important as the hole size and spacing, I make these out of 1/4" plate. I have also uploaded a properly sized SVG file if you need that too. For reference the center hole is 1.25 inches. The PDF is the same as the SVG, just ready to print out on paper to use as a template.