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Jan 23rd, 2013
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Yamaha 225 ox66 cutting out. #13535670 04/27/20 02:38 AM
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hawkeye442 Offline OP
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Looking for help, 04' Yamaha 225 vmax ox66 pulled power head and lower unit to fix broken exhaust manifold guide. Fixed everything, got everything put back together. Took it out to the lake for a test run. She started right up on 1st bump of the key and purred like a kitten, actually idled better than it ever had, let it warm up fully and went to get on plane, boat starts missing between 2500 and 3000 rpm, will not get above this, almost like its some type of safe mode. Checked plugs for fouling and checked compression, both are fine. Anyone have any ideas?

Re: Yamaha 225 ox66 cutting out. [Re: hawkeye442] #13535943 04/27/20 01:33 PM
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Skunked Again Fishing Offline
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Originally Posted by hawkeye442
Looking for help, 04' Yamaha 225 vmax ox66 pulled power head and lower unit to fix broken exhaust manifold guide. Fixed everything, got everything put back together. Took it out to the lake for a test run. She started right up on 1st bump of the key and purred like a kitten, actually idled better than it ever had, let it warm up fully and went to get on plane, boat starts missing between 2500 and 3000 rpm, will not get above this, almost like its some type of safe mode. Checked plugs for fouling and checked compression, both are fine. Anyone have any ideas?

Wow, there were a lot that had to go together right after pulling the power head and lower units. I’ve never done this on my yami, but I wonder if you can hook up some sort of computer diag tool to fire off injectors and disabling plugs one at a time.

I’ve done this on the Evinrude where if you disable one plug at a time, and you notice the idle change, then you know one cylinder is not good. It’s hard to detect at idle, but.a cylinder not firing will show itself at higher rpms. You can do this by manually removing the plug during idle and replacing it to go to the next one. That’ll give you an idea if it’s a non firing cylinder. The other could be safe mode. But typically, it’s lower rpms (like 1500). Yamis may be different, but that sounds high for a safe mode. Good luck Tim

Last edited by Skunked Again Fishing; 04/27/20 01:34 PM.

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Re: Yamaha 225 ox66 cutting out. [Re: hawkeye442] #13538209 04/28/20 09:09 PM
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I had that same motor acting similar once, and it was the fuel line kinked and crimped right where it entered through the lower cowling with all the other wires and stuff restricting the flow of fuel.

Re: Yamaha 225 ox66 cutting out. [Re: hawkeye442] #13562536 05/18/20 05:10 PM
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hawkeye442 Offline OP
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Hey Guys,

Just thought I would share what we found with my boat.. It was loose ground wires and bad plugs.. Fixed it right up.. Now she runs like a scalded ape..

Re: Yamaha 225 ox66 cutting out. [Re: hawkeye442] #13563220 05/19/20 03:35 AM
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awesome
thanks for the update

Re: Yamaha 225 ox66 cutting out. [Re: hawkeye442] #13565913 05/21/20 04:23 AM
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glad you got it going and congratulations on a job well done!

Re: Yamaha 225 ox66 cutting out. [Re: hawkeye442] #13565957 05/21/20 08:47 AM
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Thanks for following up with what you found. Nice work!


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If this kind of stuff floats your boat, be a subscriber to my youtube Channel: www.youtube.com/SkunkedAgain
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