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Old 06-20-2013, 03:57 PM
tommydbouy's Avatar
tommydbouy tommydbouy is offline
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Join Date: Mar 2012
Boat: 2009 X-15, MCX
Location: NE Ohio
Posts: 133
My 09 X-15 that I just got this spring has a similar sound at that rpm. When I got the boat I paid the local MC dealer (didn't buy the boat from him) to take us out on it for the first time to go over how everything works. He said that the noise was from the transmission and was normal. He said the noise is higher if the transmission has traditional ATF fluid in it or synthetic ATF. I got ahold of the Malibu dealer I got it from and it does have the synthetic ATF in it. The local MC dealer said the synthetic ATF won't hurt anything but after this season switch to the 15-W40 oil that MC calls for. It will help deaden the sound.
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Old 07-01-2013, 08:41 AM
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Ripple Ripple is offline
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Join Date: Apr 2013
Boat: 2014 X10 5.7 Ilmor
Location: Southeast
Posts: 81
Originally Posted by treiter View Post
My 09 X-15 has done same thing since day 1. No worries.
Good to know.

Could not get too the belts and determine if they need to be replaced. What is the general rule of thumb on when you replace belts - after how many hours or years?
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Old 07-01-2013, 10:01 AM
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GoneBoatN GoneBoatN is offline
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Join Date: Oct 2010
Boat: 2010 X-15 w/MCX
Location: Nor Cal
Posts: 3,005
Put my MCX in the here too group.
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