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  #11  
Old 05-26-2019, 03:07 PM
dom.xstar dom.xstar is offline
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Join Date: May 2019
Boat: XStar
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Knows someone which one with rotor I have to order?
I guess it's a one of Vortec 5.7!?
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  #12  
Old 05-26-2019, 09:08 PM
37tr3n5k 37tr3n5k is offline
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Boat: 2004 Maristar / 350 MCX
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Just take it off and take it to an auto parts store. Theyll Match it. It is not specifically Mastercraft. It is just a GM 5.7 cap and rotor.
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  #13  
Old 05-26-2019, 11:32 PM
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wheelerd wheelerd is offline
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A couple of other questions:
- Does the boat start easily? Both when cold and when warm?
- Does it rev quickly when in neutral? Does it stumble or lag?
- How old is the gas in the tank?
- Once you are up to cruising speed and nail the throttle does it respond immediately or bog?

If the dizzy cap is pitted like that be sure to check the rotor as well.
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  #14  
Old 05-27-2019, 06:57 AM
dom.xstar dom.xstar is offline
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Okay, let me talk with some shops they sell car parts.
I will change the cap and also the rotor. Could this condition cause any bad performance


Regarding you questions:
- I would say yes, it starts immediately. But sometimes the rpm’s after the start a little bit less and not constant.
Struggling a bit and after a few seconds it runs continuously and as is should -> But it’s not happen every start.
- Yes it rev quickly but for my feeling it could be a bit quicker / more aggressive.
- Gas is three weeks old
- I would say it bog but let me check today or tomorrow
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  #15  
Old 05-27-2019, 10:59 AM
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mtajpa mtajpa is offline
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I have an LTR not MCX but have you checked to see if the "KNOCK SENSOR" is connected. It is usually in the port block drain. Usually it is disconnected to winterize. This sensor could cause low performance if disconnected. Its purpose is to retard timing for low octane fuel in believe.

Also check for bad plug wires. Run at night look for sparks jumping off wires and ticking sounds.

The trans ratio's are A=1.56/1 in forward B=1.57/1 in reverse.

Good luck.
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  #16  
Old 05-31-2019, 08:34 PM
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DBUSH36 DBUSH36 is offline
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Dom. Did you ever get it running properly?


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  #17  
Old 06-02-2019, 03:57 PM
dom.xstar dom.xstar is offline
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Hey, more or less. I replaced the distributor cab and the rotor.
It works fine but no differences as before

Now I have a device to check the compression.
Want to do it the next few days and I let you know.

Checked also the knock sensor, seems correct connected.
Is the knock sensor only connected by one wire? Seems a bit less...

Any further hints I could check?
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  #18  
Old 06-02-2019, 09:33 PM
37tr3n5k 37tr3n5k is offline
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you really should get a diagnostic computer and hook it up to see whats going on instead of throwing parts at it. Just a friendly suggestion.
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  #19  
Old 06-02-2019, 09:55 PM
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blackhawk blackhawk is offline
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I would definitely try new wires.
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  #20  
Old 06-02-2019, 09:56 PM
StingrayDad StingrayDad is offline
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Boat: 2004 mastercraft xstar mcx
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I think you need to check ignition timing. I wonder if previous owner checked the timing and did not put it in base timing mode. If you donít put it in base timing mode it will retard the timing. Hope this helps.


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