2) the main jet is clogged (it could also be the main jet is too small but sounds like it was previously fine, so that’s unlikely) you’ll need to take the carb apart and give it a good cleaning. With most boats, it isn’t necessary to have ear protection while you’re out on the water. The engine runs great and it shifts in and out of gear smoothly. it only goes 10 mph, but with the jolts i got it up to 30mph. Recently bought a 1996 Kawasaki ZXi 1100. When trying to troubleshoot a jet ski that isn’t starting, you can break the problem down into a few basic possibilities. It’s not hard to do, it just takes some time. Jet skis have an average speed of 65 mph. One of the most common things for a jet ski not wanting to take off is from sucking something up. i bought this from in auction, so i dont know prior history. Re: Boat shifts and revs but doesn't accelerate? boat runs really good just revs out at 4200 rpms. Also it seems to want to start going faster if I throttle up slowly but then right away goes back to idle and if I continue to idle in gear for a while it seems to go slower and slower I've inspected the impeller and nothing is caught in it. The engine runs strong and the RPMs rise, but at around 25 mph it seems to lose "traction", for lack of a better term. You might not even realize it most of the time as the engine is so powerful that it will blow the debris right out of the pump without skipping a beat. 10 Reasons Why Your Jet Ski Won’t Start. The prop just doesnt seem to go faster than idle. Any help would be hugely appreciated. However, jet ski sales reps would bring great benefit to their customers by sharing the proper maintenance guidelines for watercraft units purchased by those seeking the feel of speed on the lakes. Sucked Something Up. its runs good and doesnt stall. The last comment and 5 other comment(s) need to be approved. Jet boats go an average of 25 mph but can go way beyond that if the water jets are more efficient (around 60 mph). Hi Team, I haven't been able to find an answer to my question so I'm asking here. I cleaned the carbs set the idle screw 1.5 turns out. A squirt of starter fluid at the boot while running will tell you. It revs but will not go foward or rev. Re: HElp with 650SX Revs but wont go If all you say is correct then my tip is coupler to rear of crank has stripped. It seems like it runs fine under 3000rpm but once you try to go over that it seems to bog down. Once it is in the water it wont' rev past 3000 rpm and only goes about 3 mph. 2000 waverunner 1200 engine revs rpms go up but it wont go I have a 1999 yamaha xl 1200 that has just had a new motor put in y the dealer. Tips on how to fix water entering the hull of your jet ski and a Waverunner that stalls. If it revs you have a vacuum leak. i have a 1994 seapro renegade with the 90hp sportjet engine. 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