I used to race karts mine is an alcohol fueled kart, briggs flat head old style engine powered still have it along with a bunch of parts, engines and extra tires etc. fun to do gets expensive being competitive I built all my own engines. I raced under wka rules in and around Virginia and west Virginia, here in Texas I raced outlaw run what you brung against 2-strokes and over head valved engines. I built one engine that has a blue printed tilliston carb, hot cam, lightened flywheel ,billet ARC rod, racing piston, ported, lots of secret things it will turn over 9,000 rpm. I'd rebuild it after a day of racing.
Norman