GP1200R not accellerating over 5mph & engine vibration?

[TJCwolf]

I had my 02' GP1200R out last Sunday and about 20 minutes into riding on calm flat water it just bogged down to about 5mph and if I rev'd it up past 2000rpm it would rattle/vibrate and not actually go any faster. It idled perfect and would run fine from 1-5mph but then just rattled more the higher it was rev'd. Someone told me it's possibly the pv's but I have not seen any descriptions of issues related to them breaking. Anything at this point would be helpful, even a good mechanic in the fort lauderdale area...

The ski has 67 hours on it and the cat con was replaced with a d-plate around 40hrs.

[tom21]

Re: GP1200R not accellerating over 5mph & engine vibration?

I had this happen to me maybe the same problem, makes a slight bit of noise on the hose but in the water sounded like like grinding gears when shifting a car. turned out the splines on the pto had correded and the driveshaft was spinning in the pto. out of the water it turned the impeller by hand or running in the water just made an awful noise.

[leon phelps]

Re: GP1200R not accellerating over 5mph & engine vibration?

Sounds impeller related. I would guess one or two broken blades. Could also be some fighing string in there stopping you from getting the rpm's.

Now that is winter it is a perfect DIY project.

I am not sure how someone would think an '02 would be rusted to where the shaft would be shot.

[miami-k9]

Re: GP1200R not accellerating over 5mph & engine vibration?

Glad you found the site I mentioned. Its been helpful for me.

[dowkk]

Re: GP1200R not accellerating over 5mph & engine vibration?

There will be plenty of time to look for rusted splines and busted blades BUT start with the simple stuff first. Like weeds, grass, underwear etc.

Crawl under the ski while on the trailer, with a good flashlight, and see if you sucked anything up into the pump / prop. You should be able to look into the intake grate. If you see weeds, string, small fish or marine mammel pieces you have found the problem. Remove and test in the water.

If nothing obvious is in there will also be able to see your prop and intake, also looking for anything bent or broken.

We have plenty of grass here. When we pick up a clump the ski will do exactly what you describe. The more you pull the throttle the more it will shake, rattle and not roll. The easy fix is to go over the side, engine off of course, and dig around underneath. The grass is often hung up right at the entrance to the intake.

[TJCwolf]

Re: GP1200R not accellerating over 5mph & engine vibration?

thanks for the advice, I will check the impeller. I jumped in the water and checked the grate for debri as soon as it happened, but I'll check again up past the grate tomorrow. And, just for the record in case it helps diagnose, The ski still had no problem rev'ing up but the higher you got over the 5mph 2000rpm mark the more it sounds like it was going to explode and it wouldn't get any faster. It vibrates to the point where the plastics start rattling louder then the motor. I would only rev it to 5-6k rpm for a brief sec or two, just to see if it would open up, but unfortunately it didn't. I'll check the prop, but if anyone has any other suggestion, there more then welcome.

[dowkk]

Re: GP1200R not accellerating over 5mph & engine vibration?

As info. When something like grass or weeds is partially blocking the WATER flow it will still allow the engine to rev up to high speed. The ski will barely move and the ski will vibrate because the pump was designed to pump water, not a mix of water and air bubbles.

Hopefully you will find this simple solution . If not, you have at least eliminated this simple inspection first, and can move on to other checks.

[leon phelps]

Re: GP1200R not accellerating over 5mph & engine vibration?

My money is on a warped sleeve in the housing. After it warped it trashed the impeller.

Any other bets?

[David3aces]

Re: GP1200R not accellerating over 5mph & engine vibration?

cavitation or overheat rev limiter coming on...look up inside intake for something wrapped around driveshaft or between impeller and stator vanes

[TJCwolf]

Re: GP1200R not accellerating over 5mph & engine vibration?

Wow, thanks for the great information, I was actually able to locate the problem. A round piece of plastic about the same size of a bottle cap had gotten wedge on the propellar. I could only see it from the inside once I took the grate off. Have had it in the water twice since then. Never would have guessed a little thing like that could make it feel like its going to explode...Crazy


Thanks Again. :emoticont

[David3aces]

Re: GP1200R not accellerating over 5mph & engine vibration?

My money is on a warped sleeve in the housing. After it warped it trashed the impeller.

Any other bets?

Just a bottle cap....go back to Love makin.....

[dowkk]

Re: GP1200R not accellerating over 5mph & engine vibration?

There will be plenty of time to look for rusted splines and busted blades BUT start with the simple stuff first. Like weeds, grass, underwear etc.

Glad to hear it was something simple. Too bad it was just a piece of plastic. I was rooting for underwear or, at least a piece of bikini bottom. Would have given all of us in the colder climates something to occupy our imaginations while we try to get through the off season.