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 45 Mag 1 Cylinder Not Firing 
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Post 45 Mag 1 Cylinder Not Firing
Posting for a friend:

New coils, new spark plugs both sparking. Bypass kill switch no change. Cleaned carb, .005 valve clearance. 190 compression and passed leak down. Rods are straight.

Any ideas?

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2016 Prodrive X 1848 37efi


Sun Dec 09, 2018 8:37 pm
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Post Re: 45 Mag 1 Cylinder Not Firing
Check the diodes that connect to the coils.

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Sun Dec 09, 2018 11:26 pm
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Post Re: 45 Mag 1 Cylinder Not Firing
If it's cylinder #1 I've seen the the vacuum fuel pumps leak fuel into the pump signal line flooding the num1 cylinder


Mon Dec 10, 2018 12:25 am
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Post Re: 45 Mag 1 Cylinder Not Firing

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Mon Dec 10, 2018 7:16 am
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Post Re: 45 Mag 1 Cylinder Not Firing
He says his engine doesn't have diodes connected to the coils on his engine and if you're standing behind the boat it's the right side not working

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Mon Dec 10, 2018 12:38 pm
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Post Re: 45 Mag 1 Cylinder Not Firing
That would be cylinder number 2. That eliminates the possibility of the fuel pump. Next I would remove cowling and inspect the intake gasket going to the head. Gasket may be popped.


Tue Dec 11, 2018 12:13 am
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Post Re: 45 Mag 1 Cylinder Not Firing
Turned out to be a bad oil sensor

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Tue Dec 11, 2018 12:36 pm
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Post Re: 45 Mag 1 Cylinder Not Firing
Nevermind... Problem is back

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Tue Dec 11, 2018 7:34 pm
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Post Re: 45 Mag 1 Cylinder Not Firing
Problem was just in the carb setup. It's alive and running good now


Fri Dec 21, 2018 10:45 am
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Post Re: 45 Mag 1 Cylinder Not Firing
Found that I am having the same problem. Right side standing behind the motor doesnt appear to be firing. What did you find in the carb setup that created the problem? I found mine not firing when trying to adjust the idle. I cannot get the motor to idle properly at all.


Fri Dec 21, 2018 10:38 pm
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Post Re: 45 Mag 1 Cylinder Not Firing
When it came in I noticed a idle fuel screw broken off in carb. Set valves, it passed a leakdown . I got the broken screw out and freshened up carb. Ran good after that


Sun Dec 23, 2018 8:52 pm
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