Re: GHX50 honda 4stroke
I would recommend the Golden Eagle Bike Engines synchronous belt system. They sell a kit without an engine so you can use your Honda GXH50. I have had mine for almost 2 years now and I prefer it over any friction or chain drive I have tried. I am planning on getting the same Honda engine to replace my Robins Subaru EH035 when it dies someday (1200 + miles and still running great, so it might be a while) Still, I am looking forward to 2.5 HP vs 1.6 HP currently (33% -45% greater power depending on the RPM)
Good luck on you build.