Welcome-The Murray is probably a friction clutch and chain drive-couldn't see it in the pic's-Which one wheel drive is very common for that type of clutch. Using just a steel rod for an axle isn't really going to last any length of time assuming you could find the right size to fit a bearing,hubs,brake drum or disk and sprocket holder through it correctly. By the time you cut in keyways and thread the ends you'd be better off just buying an axle and bearings w/flangettes designed for a go kart. I'm betting your buddies kart didn't have the CVT set-up that he put the alternator on- The CVT system doesn't give you a place where the belt is constant and stay in contact with the alternator drive pulley as the belt is moving between clutch and driven up and down.If I was to try and put and alternator on a kart with a CVT you'd need to see about extending a jackshaft at the driven somehow and put another pulley to drive the alternator,lots of machining assuming there is room to get it all back there.Your Yerfdog has the typical bent up steering arms and a bent spindle from the less than comfortable single A-arm suspension! Not bad for $250.
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