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Author Topic: 07 Mokai with EX21 upgrade shutting down  (Read 6740 times)

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Offline hotrodelrod

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Re: 07 Mokai with EX21 upgrade shutting down
« Reply #15 on: August 06, 2017, 08:37:18 AM »
So I pulled the engine and ran it on the bench yesterday. Same gas tank, fuel lines etc. Ran like a top and no leak whatsoever. Ran it wide open for a few minutes....nothing! We all know things rarely fix themselves, especially a boat. No doubt as soon as I get it in the water it will act up again >:(

Offline Painlesstom

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Re: 07 Mokai with EX21 upgrade shutting down
« Reply #16 on: August 06, 2017, 09:10:04 AM »
You should never never never run a motor full throttle without a load. It tells you nothing either, the engine only requires a fraction of the fuel without a load. How much oil is in it? Too much will cause issues. On a flat surface, the oil should not come past the step that is below the fill plug threads.
Tom

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Offline hotrodelrod

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Re: 07 Mokai with EX21 upgrade shutting down
« Reply #17 on: August 06, 2017, 09:45:49 AM »
Do you measure oil with the plug screwed in? Where on the stick should it read?

Offline Hillbilly

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Re: 07 Mokai with EX21 upgrade shutting down
« Reply #18 on: August 06, 2017, 10:59:55 AM »
Running OK on bench might lead us to believe that heat is a factor.  Don't forget about the coil.

Offline happul3

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Re: 07 Mokai with EX21 upgrade shutting down
« Reply #19 on: August 06, 2017, 12:02:47 PM »
So the theory is that the carb bowl is overflowing, right? Assuming you have already cleaned needle and polished needle seat as per Tom's recommendation and that was not enough, would it make sense to temporarily install a fuel pressure gauge and use it to reduce fuel pressure by putting restriction and/or leak into pulse line? Something I almost did myself when I had carb gas leak, but polishing did really fix the problem for me...

Offline happul3

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Re: 07 Mokai with EX21 upgrade shutting down
« Reply #20 on: August 06, 2017, 12:07:26 PM »
Do you measure oil with the plug screwed in? Where on the stick should it read?

If you remove the plug and shine light into the hole, you can see threads. I think the recommended level of oil level is right at the very bottom of threads.

Offline Painlesstom

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Re: 07 Mokai with EX21 upgrade shutting down
« Reply #21 on: August 06, 2017, 06:33:46 PM »
Do you measure oil with the plug screwed in? Where on the stick should it read?

You look into the fill plug hole, the oil should not come past the ring below where the threads are, up too the threads is way too much. I don't use the stick so can't say where it should land for sure, the engine sits at an angle in the boat when in the water, so filling till the stick says full is too much.
Tom

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