How Fast Can A Jet Ski Go? So how fast can a jet ski go? Well, after some research we found that the slowest jet skis go about 40 mph while the fastest ones go about 65 mph. Newer jet skis might be able to push 70 mph at most, but we would not be surprised if a few years down the line that changes. Important: Remember to be Safe As mentioned above, jet skis are nowhere near as fast as cars or as heavy but that does not mean that you should let your guard down when you are around them. Do keep in mind that jet skis are still fully functioning machines which means one wrong, careless move and accidents are bound to happen. Jet skis have HP that is very comparable to motorcycles and large outboard boat engines. Did you know that jet skis make up a mere 9 percent of all registered marine vessels in the United States but they account for 26 percent of reported accidents? The Sea-Doo RXP-X 300 can go 0 to 60 in 3.8 seconds. That’s kind of crazy for a boat. There are no speed limits signs for boats. The closest thing you’ll have is a no-wake buoy, which means you can’t go above idle in that area. Ideal Boat Speeds by Water Activity Suggested speeds for various recreational skiing activities are provided in the chart below: Activity Boat Speed Combo Skiing 25 mph Slalom Skiing 19-36 mph Shaped Skiing 20-30 mph Wakeboarding 16-19 mph Kneeboarding 16-19 mph Barefooting 30-45 mph Jump Skiing 24-35 mph Ski Racing 60-130 mph Trick Skiing 11-21 mph Tubing 8-25 mph.