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Name:	Haltstep -	Reply
Subject:	Hey Cat!! Yamaha FX140 Wave Runner
Date:	5/8/2012 8:08:54 PM

Hey Cat!

Just purchased a used 2003 Yamaha FX140 waverunner with 170 hours. Max speed is 37 mph and 7500 rpm in water so I replaced NGK spark plugs, but still same problem. RPM will hit 10000 sitting on the trailer, but I will only run it for a few seconds. Engine runs smooth at idle and while accelerating---just poor top end performance. Any ideas on where to go from here in troubleshooting?

Name:	GoneFishin -	Reply
Subject:	Hey Cat!! Yamaha FX140 Wave Runner
Date:	5/8/2012 9:15:19 PM

I make an appointment and drop it off at Cats.

Name:	Kizma Anuice -	Reply
Subject:	Hey Cat!! Yamaha FX140 Wave Runner
Date:	5/8/2012 9:55:13 PM

Have you cHanged the fuel filters?

Name:	Ulysses E. McGill -	Reply
Subject:	Hey Cat!! Yamaha FX140 Wave Runner
Date:	5/9/2012 12:35:14 AM

Is that off the speedo or a gps? Speedo may be wrong or clogged. If your getting that kind of RPM and the speedometer is correct, you may have a damage impeller or something restricting water flow in the intake.

Name:	CAT BOAT -	Reply
Subject:	Hey Cat!! Yamaha FX140 Wave Runner
Date:	5/9/2012 9:32:26 AM

I have very limited experience with Yamaha FX140 PWC. I'll take a shot at the question though. Your 7500 rpm sounds just fine, however that would yield a lot more speed than 37mph. I have scene this problem once before. Impeller clearances were perfect and everything about the pump looked fine. However, it had excessive cavitation and pump slip. There is a seal kit available for the pump unit and ride plates. It required a little bit of time to install, but afterwards the FX ran great. Best I remember, it ran around 70????? I don't remember what top end was before we made the repairs, but it was not good. I just saw that customer the other day, and remember his name. I will look in his file and get my research notes and read through them. If you want, you can call me later today. I am at Lake Martin Shop. 256-825-3388. I will share that information with you.

Respectfully,
Steve

Name:	houseboat -	Reply
Subject:	Hey Cat!! Yamaha FX140 Wave Runner
Date:	5/9/2012 10:50:18 AM

Does it have a reverse? If so, is it part way in neutral?
Talk to the previous owner about why he sold it.

Name:	Ulysses E. McGill -	Reply
Subject:	Hey Cat!! Yamaha FX140 Wave Runner
Date:	5/9/2012 12:54:46 PM

If it's not a bad speedo, I agree with Steve that this could be the problem. I had something similar on one of mine a few years back, but you could hear the cavitation taking place. Houseboat also makes a good point of something to check. What ever it is, I'm sure Steve can figure it out.

Name:	Summer Lover -	Reply
Subject:	Hey Cat!! Yamaha FX140 Wave Runner
Date:	5/9/2012 1:30:44 PM

You may want to try taking the PWC off the trailer when you put it in the water - having that thing underneath when you are trying to ride will slow you down.

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