Just remember KDM you can only go about 300 yards and then you have to stop and drink a beer and bullshit with someone for 15 min. Friend of mine bought a used one for grand kids to drive around on and they have burned a piston on it twice. I dont think the gas ones are made to long hall a distance. My brother quit golfing a few years ago and gave me his gasser to use on the farm and around the garden and I use the hell out of it. Garden, run the dog, trap gophers, and just go cool off once in awhile. Just never go more than a mile at a time. Might put gas in it 3 times a year, think it holds about 6 gal. Top end is about as fast as my Lab is at a good lope. As soon as weather is above 40 I bet I put on about five miles a day until freeze up. In the pasture when I am trapping Gophers I have to watch out for old gopher mounds cause mine dont have a lot of ground clearance and it will high center. I keep a 6' 2x4 in the back so I can push myself off, better than walking home. LB
LB , he might want to check for a clogged/plugged muffler. One of ours used to smoke and overheat and it didn't have much get up and go. I thought the motor was used up but it had all sorts of compression, I took the exhaust off and it was so plugged up that the leaf blower wouldn't blow through it. Rigged up a makeshift steel pipe from leaf blower to muffler and heated muffler with a bertha torch until I got internal combustion and it burned and shot fire/sparks out for 4 hours after I turned the torch off. Put it back on and cart ran like a new one.
I don't trust oil injection on carts, what little gas they use I'll gladly mix 5 gallons at a time.