300X Wont rev over 6000rpm

[morte]

My 2013 Ultra 300X with 76 hours doesnt seem to want to rev over 6000rpm.
Ski starts and runs like normal just once rpm gets to 5750 to 6000rpm it just stay there with a little bit of a jerk like it has a rev cut.

Found that exhaust filter was blown out and had blocked the muffler, thinking that was the problem, replaced the filter and cut muffler to remove jammed filter.
Cleaned out intercooler while doing the exhaust filter and checked all hoses which were all good.
Problem still remained.
Replaced spark plugs.
Disconnected scom.
Problem still remains.

Have not checked with the SLO key yet.

Can anyone think of what I should do or check next?

Thanks in advance.

[Spooling]

Stuck Tensioner?

Ski starts and runs like normal just once rpm gets to 5750 to 6000rpm it just stay there with a little bit of a jerk like it has a rev cut.

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Supercharger Drive Belt Tensioner

http://greenhulk.net/showthread.php?t=241660&page=2&p=2655153&viewfull=1#post2655153

Good Luck !!!

[morte]

So just remove, clean, re-lube and re-fit?

[Hurricane1000]

Yes and make sure your supercharger belt tensioner is working properly by moving it back and forth with a socket on the nut

[maiko]

Would be good to have a stinky on the process to trouble shoot rev and performance issues with a 300 and a 310 with links to other forum posts that walk though the process of SC belt change and SC tensioner removal and refit.

Sounds like myself and a few other Kawi owners are coming up with the same issues, could be because the ski are reaching a particular age and hour of use.

[sirbreaksalot]

Would be good to have a stinky on the process to trouble shoot rev and performance issues with a 300 and a 310 with links to other forum posts that walk though the process of SC belt change and SC tensioner removal and refit.

Sounds like myself and a few other Kawi owners are coming up with the same issues, could be because the ski are reaching a particular age and hour of use.

no new problem with the ski platform

I find its just new people coming into the sport and a lot of poor quality servicing / mechanics claiming to be specialists in watercraft do repairs making bigger issues out of something that has been the same for years now ...

Waz

[maiko]

%100 correct Waz.

I put my faith in a service tech to pick these types of issues up as part of routine maintenance, after all they are the experts at it. For these issues to pass straight out of a work shop service is disappointing.

The upshot... by using the resources on this forum I can do the routing stuff myself now and can be sure it's done the right way.

FYI - I didn't end up calling that bloke you recommended and opted to get a second opinion from someone else. I'll keep the reference up my sleeve just in case though.

Mike

[morte]

Yes and make sure your supercharger belt tensioner is working properly by moving it back and forth with a socket on the nut

The tensioner was seized up, I have finally pulled it apart and not just need to clean and re-lube it.
Do I use any special grease or is anti-seize a better option?

[Hurricane1000]

The tensioner was seized up, I have finally pulled it apart and not just need to clean and re-lube it.
Do I use any special grease or is anti-seize a better option?

No antiseize

[Spooling]

The tensioner was seized up, Do I use any special grease?

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Such is clearly defined in the link I posted above - back in January.

[WesM]

I purchased two 2011 300 Ultras. They both have about 100 hours on them. One works just fine. The other sags at about 6000 rpm and will not go over 50 mph. It accelerates just fine from a stop, but then stalls/sags at the 6000 rpm point. Based on comments found here, this weekend I removed the tensioner pully. The bearing was completely seized (badly). Cleaned and polished it and installed a Zerk fitting. Took it to the lake and problem was still there.

Previously, I had checked the cylinder compression and they were all normal (on both skis). Spark plugs are new. Gas is fresh.

I'm not sure that the local Kawasaki dealer is particularly proficient in jet skis. They are predominantly a motorcycle shop, but are the only Kawasaki dealer close by. They claim that the engine is not showing any codes.

What should my next step be? A check of the exhaust filter? What's the opinion on putting in a bypass in lieu of a replacement filter?

I appreciate all the comments and also the patience of this group. I can see from our one ski, that these are really great machines.

I would appreciate any suggestions or hints that anyone can provide.

Thanks in advance.

Wes M

[Cranofwaterfell]

I would check the intercooler next to make sure it's clean/not restricting airflow from SC to intake.