XP on & off bogging

[get_real]

Well I've had my 96XP for about 2 months now....it runs great and gets up to just shy of 9000 rpm. But every once it awhile it will still stumble and won't accelerate past 3000 rpm.

If you just hold the throttle open it won't clear up. But if you turn it off for 30 seconds then start it back up and accelerate quickly the bogging goes away. Sometimes you have to repeat the procedure 3-4 times but eventually it will return to normal.

I noticed today that if you hit a wave while trying to accelerate from a bogging episode and suck some air in the pump it won't clear the bog. It has to accelerate after starting without sucking air.

Curious if anyone has an idea of what might be wrong or has ever had similar symptoms? I was hoping it would clear up with more use but no dice!

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[Coastiejoe]

A rectifier can cause this. Disconnect it, if it clears the issue you need a new rectifier.

 

[CReynoldsMIZ]

9000 rpms? That's would be a first on a 787. U sure you don't mean 7000?

 

[dan87951]

9000 rpms? That's would be a first on a 787. U sure you don't mean 7000?

haha that's what I was thinking. That thing must really scoot at 9000rpms ! My vote is on the rectifier.

 

[get_real]

haha that's what I was thinking. That thing must really scoot at 9000rpms ! My vote is on the rectifier.

Yea....I stand corrected...about 10 rpm short of 6000! Seems the rectifier might be the culprit. Will check that out.

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[get_real]

A rectifier can cause this. Disconnect it, if it clears the issue you need a new rectifier.

Are you guys talking about the voltage regulator? I don't see a rectifier in the manual. I did try removing the red wire from the voltage regulator early on and it didn't help the bogging.

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[AdamXP800]

10 short of 6000???? It should be turning 10 short or 7000. Is this what you meant?

 

[brandon85]

I had a problem similar once and ended up being a bad regulator. took care of that problem permanently!

 

[get_real]

I had a problem similar once and ended up being a bad regulator. took care of that problem permanently!

I might try replacing it. My battery light has started to go on and off though it doesn't coincide with the bogging episodes. Where did you buy it at?

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[Matt Braley]

Might try? These guys have nailed your problem without a doubt. I can confirm because when I had one failing I learned to work it just as you described. I would cut it off and then hold it wide open and hang on pressing start and keeping it pinned until I got home. Little did I know I was probably slamming my electrical system with like 15-16 volts. :facepalm:

 

[get_real]

Might try? These guys have nailed your problem without a doubt. I can confirm because when I had one failing I learned to work it just as you described. I would cut it off and then hold it wide open and hang on pressing start and keeping it pinned until I got home. Little did I know I was probably slamming my electrical system with like 15-16 volts. :facepalm:

I disconnected the red wire when in Tampa at the bash and that didn't solve the problem. But agree I need to try replacing it since maybe it has gone bad since then. Ordered a new one from OSD this morning! Thanks for the push! Also I was wrong.....it gets to 6990 rpm max when not bogging, not 5990.

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[silverwolf311]

my brother has the same model as you do and his was a rectifier. id try that like the above members stated

 

[powerslave]

The red wire you unplug, is it the one INSIDE the mpem at the rectifier?

 

[get_real]

The red wire you unplug, is it the one INSIDE the mpem at the rectifier?

Yes ...it was inside the front ebox. There were many wires coming out of the rectifier but only 1 red one. Unhooked it and took if for a spin and it still bogged. However the dealer fixed several issues like replacing the baffle, fuel selector and stator. I'm just going to replace it and hope the folks on this thread ate right.

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[AdamXP800]

Are you still having issues with the ski you just bought?? Did the dealer not fix the ski? After paying a premium price for that ski I would be hot!!!!

 

[get_real]

Are you still having issues with the ski you just bought?? Did the dealer not fix the ski? After paying a premium price for that ski I would be hot!!!!

Yep, it's the one I paid too much for about 3 months ago. I took it back 3 times under the 60-day warranty. Parts they replaced include the VTS motor & cover, fuel tank baffle, fuel selector, and two stators. They felt the VTS box/motor was somehow killing the stators, so they unhooked the VTS.

However none of the things they've done has solved the bogging. I could take it back again, but it's a huge hassle. They are 70 miles from my house, I'd be missing lots of lake time and I don't think they have the expertice to solve it quickly. Last thing they recommended I try was adding an additional ground wire from the battery to the motor. However by stopping & starting I can always get it to run and except for the frequent stops am having fun. I'm also enjoying working on it myself & learning from you guys.

My plan now is to fix it myself, then see if the dealer (Chad at TCH Watersports) is willing to either pay for the parts or provide some future credit.

Last night I worked on the VTS as I really want that thing working. I don't see how it could be killing the stator. I did have a ton of water in the box and everything was coroded. I've been leaving the ski in the water on the weekends so guess the boot went bad. Had to clean up and paint the motor, greased the turn-screw, installed a new boot & plastic squeeze clamps, and tested it out. I even ran an amp test on the motor with my voltmeter to see if maybe it was pulling too many amps. It would sometimes spike up to 4 amp when starting up, but would quickly go down to less than 1 amp, around .8 or so. It's working perfect now so I don't think any of the problems are related to the VTS.

My new rectifier is coming today from OSD, so will install it tonight then test the ski on the water in the next couple of days. Keeping my fingers crossed that it will solve the bogging and battery light problems! :thumbsup:

 

[dan87951]

This really sounds electrical related to me -- because you said once you power cycle it the problem is gone for a while. I'm wondering if there is something going on with your ignition system. Have you clip backed your spark plug wires? By chance do you know someone with a 96 XP to swap out MPEMs? Have you checked your battery ground (these are cheap so best to replace any autoparts store will have one) ?

Also good plan on working on the ski yourself -- if you want something done right you have to do it yourself. At least thats what I have learned!

 

[get_real]

This really sounds electrical related to me -- because you said once you power cycle it the problem is gone for a while. I'm wondering if there is something going on with your ignition system. Have you clip backed your spark plug wires? By chance do you know someone with a 96 XP to swap out MPEMs? Have you checked your battery ground (these are cheap so best to replace any autoparts store will have one) ?

Also good plan on working on the ski yourself -- if you want something done right you have to do it yourself. At least thats what I have learned!

I agree it's probably electrical, as I can't see what stopping & starting would do on the gas side of the equation. I've had people talk about spark plugs, and now you mention wires, but that makes no sense to me either. If those were issues they'd be relatively constant or be impacted by vibration, not by turning the engine on & off. I did notice last night while disconnecting the ground wire from the battery that it was a little dirty and sanded it clean, but again, don't see if that was a problem why it would help to cycle it off & on.

One other fact is when the ski is running well, it never just goes from WOT to bogging. The bogging only seems to begin after the letting go of the throttle and then squeezing it again, like when starting up from an idle or after slowing from WOT. If something was lose or not making good contact you would think it could happen at WOT going over waves.

Don't know anyone with a MPEM except maybe the dealer, but if the rectifier doesn't solve it that may be my next line of attack. Thanks for the reply.

 

[get_real]

Just got my new rectifier today and will install this weekend. Did a little more research on how they work and why when they start to fail they can act like a rev limiter causing the "bogging!" Also found out why sometimes they are referred to as voltage regulators and sometimes as rectifiers.

Jet ski rectifiers have two basic functions. First they convert A/C current output from the magneto into DC voltage, and second they regulate the current.

AC voltage from the magneto swings from about minus 25 to plus 25 volts. Diodes in the rectifier smooth out the highs & lows and create the direct current needed for all the electrical requirements of the ski for things such as spark, MPEM operation, and accessories.

The regulator section of the rectifier keeps the DC voltage output at about 14 volts. The MPEM must have consistent voltage to function correctly. If the rectifier begins to fail and the output voltage is high or intermittent, the MPEM cannot function correctly and will act like a rev limiter.

By stopping the ski during one of these episodes, A/C current is drained from the system and upon restart the rectifier may initially begin to perform correctly. One thing I’m not exactly sure of is why when the rectifier begins to fail it seems to help after restart if you use WOT and no air gets sucked into the pump. My guess is that the ski in this state is consuming the excess voltage or possibly the MPEM doesn’t enter the rev limit state until it senses a drop in engine load/speed.

 

[CReynoldsMIZ]

Just got my new rectifier today and will install this weekend. Did a little more research on how they work and why when they start to fail they can act like a rev limiter causing the "bogging!" Also found out why sometimes they are referred to as voltage regulators and sometimes as rectifiers.

Jet ski rectifiers have two basic functions. First they convert A/C current output from the magneto into DC voltage, and second they regulate the current.

AC voltage from the magneto swings from about minus 25 to plus 25 volts. Diodes in the rectifier smooth out the highs & lows and create the direct current needed for all the electrical requirements of the ski for things such as spark, MPEM operation, and accessories.

The regulator section of the rectifier keeps the DC voltage output at about 14 volts. The MPEM must have consistent voltage to function correctly. If the rectifier begins to fail and the output voltage is high or intermittent, the MPEM cannot function correctly and will act like a rev limiter.

By stopping the ski during one of these episodes, A/C current is drained from the system and upon restart the rectifier may initially begin to perform correctly. One thing I’m not exactly sure of is why when the rectifier begins to fail it seems to help after restart if you use WOT and no air gets sucked into the pump. My guess is that the ski in this state is consuming the excess voltage or possibly the MPEM doesn’t enter the rev limit state until it senses a drop in engine load/speed.

Good Stuff Get Real! It seems like you are getting to know your ski pretty well, huh? Probably a few more problems than you were hoping when you bought it from the dealership LOL

 

[BIGTEX2010]

[MENTION=62509]get_real[/MENTION] any updates??

 

[get_real]

Unfortunately no....my XP is sitting at the lake and I'm at home....haven't been able to install the rectifier yet. Hopefully will head out there soon. Saw an XP racing Sunday in Macon GA and can't wait till mine is running well!

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[get_real]

Well I installed the aftermatket recitifier Friday. First ride out and it didn't bog and the battery light never came on. However took it out today twice and it did start bogging again. Same thing...turn it off and if you don't get up to speed fast it won't clear.

One thing that was weird is that except for the red wire coming from the rectifier there is no corresponding red wire to attach....the old unit went red to pink! Could I have an ebox from another model??? Very frustrating.

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[get_real]

Took it back to the dealer today. If they can't figure it out not sure what I'm going to do.

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[rysleri]

Thanks to this forum!! I'm from finland,two summer i have tried to do everything,but loss power in full throttle. Now i have unplug red wire today. My xp 96 work so nice. I have now order new voltage regulator:thumbsup: