Performance upgrades for a tecumseh 6.5 hp engine.?
I have a tecumseh ohh65 engine(6.5 hp powersport) on my go kart. I'm looking for some upgrades that aren't too expensive(under $100) or too hard to do(i'm not to good with working on small engines). I was thinking about a new muffler and a upgraded air
the exhaust can be modified by taking the muffler off goint to a hardwair store and having them match the pipe threads and using steel pipe pieces and a volkswagen beetle muffler. the air intake may work with some rubber hose, some clamps and a chevy

It lets some engine noise escape into tuned chambers. Emits a high-performance sound when accelerating and gets rid of in-cabin resonance at cruising speeds
Cost Effective Engine Performance Tuning With Powerful Pontiac Muffler Constructions. Because most of the engine action happens right at the exhaust system components like your Pontiac muffler is