with a good sentrifical clutch about 40 to 50mph
25-40
about 25-30 mph
As fast as it was designed to go. We just know it has 60 horsepower... doesn't tell us the weight of the vehicle, the torque output of the engine, how the drivetrain is geared, etc.
About 10 to 12 on plane
I don't have a 5 HP go-kart.
The engine will run to the limits of it rpm (revolutions per minute). The go-cart will travel as fast as the gearing and torque of the motor allows. Theoretically, you could get a nitrous kit for an 8hp lawn mower engine and do a one-time burst to like 50 HP and maybe 100 mph, before the engine exploded and your go-cart disintegrated. One of my sons manged to get his go-cat up to 66 miles per hour using a 12hp Tecumseh motor from an old lawn tractor. Scary, very scary, but very fast. The neighbors called the police.
i have 5 hp Tecumseh that goes about 30-45 at top speed and my other 16hp duromax goes way faster so maby 60-70 mph
15
about 40mph
165 hp
50 to 60