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Old    Rony (wake_mafia)      Join Date: May 2007       06-16-2009, 11:48 AM Reply   
I just got our new X and I have a question in regards to the Ly6. When the RPM hits about 5400, the motor cuts in and out. Dealer said that this is the rev limiter. Have any of you experienced this issue?

Thanks.
Old    Brett Yates (polarbill)      Join Date: Jun 2003       06-16-2009, 11:55 AM Reply   
Sounds about right. What in the heck are you doing even running it at those kind of RPM's? You may check the prop. If you have a prop designed for heavy weight and hole shot you might only be able to top out at 35-40mph. In any case I don't think I would want to be running at 5400 rpm.
Old    Rony (wake_mafia)      Join Date: May 2007       06-16-2009, 12:01 PM Reply   
we were just test driving it on the lake with the dealer and they had us open it up. Got to about 45mph. They said that the cutting out is normal.
Old    C.I.E..... Evan (guido)      Join Date: Jul 2002       06-16-2009, 12:30 PM Reply   
Oh yeah.... for sure. You're hitting the rev limiter. You can prop it to have more top end and not hit the rev limit, but you'll lose some of your loaded hole shot.

Anyway... Rev limiter is there so you wont blow your motor up by over revving, but don't let the boat sit on that thing. That's a lot of RPM's for a 6.0

They're definitely not made to go fast. Ours rarely sees more than about 30-35mph.

(Message edited by guido on June 16, 2009)
Old    Dave (schmo)      Join Date: Oct 2003       06-16-2009, 12:35 PM Reply   
Yep, the rev limiter is your friend. It cuts off the fuel so you won't over rev and blow your engine. This is typcial on almost all modern boat and car engines. I know I have bumped in a couple times in my Z06.
Old    Rony (wake_mafia)      Join Date: May 2007       06-16-2009, 2:06 PM Reply   
I understand that the rev limiter is there in order to not blow up the engine. You would think that the engine would be tuned with the right size prop to prevent it from hitting that RPM.
Old    Ewing (johnsvt)      Join Date: Dec 2006       06-16-2009, 2:14 PM Reply   
Load the boat with 3K worth of ballast and it won't hit the limiter.
Old    Greg Holloway (gregholloway)      Join Date: May 2009       06-16-2009, 2:30 PM Reply   
What size prop is on it? I have 2007 X-Star with the LY6 and have never hit the rev limiter!
Old    Rony (wake_mafia)      Join Date: May 2007       06-16-2009, 2:53 PM Reply   
Greg, I looking into that now. I had driven another 2008 X with the LY6 and wide open it never hit the rev limiter. The dealer told me that the boat we bought had the stock prop but something doesnt add up. What prop are you running?
Old    Brett Yates (polarbill)      Join Date: Jun 2003       06-16-2009, 3:36 PM Reply   
I think the 14.25x14.50 is the high altitude prop?
Old    Evil0ne (evil0ne)      Join Date: Sep 2006       06-16-2009, 3:40 PM Reply   
It's tough to have the right sized prop because MasterCraft doesn't know what altitude and weight you are running.
Old    Rony (wake_mafia)      Join Date: May 2007       06-16-2009, 4:52 PM Reply   
I can understand that they dont know what altitude and weight Im running. But you would think that it would be set up not to hit the rev limiter out of the box.
Old    Craig F (craig_f)      Join Date: Feb 2008       06-16-2009, 8:43 PM Reply   
Nope, how and where you run it makes a dramatic difference in what prop you run. A speed pop in Florida would have trouble getting a loaded boat out of the water in Denver. The power prop in Denver would over rev an unloaded boat at sea level.

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