Thread: Yamaha VMAX OX66 fuel injection 225

Originally Posted by Zman

Thanks for that information, it just start this , will start with no problem and may do good a dozen times, then just turn over and not fire at all , it set a hour or so and started right up. One time won’t start got it back on the trailer took it to the shop and it started every time for them. They say they couldn’t check anything until it did it for them. Put it on a computer or anything til it won’t start for them?


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I have a 250 that does this exact same thing? Runs great until it don't! Can sit for an hour and will start right back up.

Don't know about Yamahas but years ago I ran into a couple Evinrudes that did this. The problem was with the power pack. They would heat up after running a while and electronic components would quit working. After cooling off it would run again until it heat up. New power packs fixed the problem. Whoops, I see I mentioned this about 5 years ago. Sorry about that.

Not sure if Yamaha has one on my Opti I was experiencing similar symptoms turned out to be the main power relay. Took 3 years before I figured it out when it finally would not start so intermittent the dealer had no luck finding it. Check all your neutral start switches.

Originally Posted by Barnacle Bill

Don't know about Yamahas but years ago I ran into a couple Evinrudes that did this. The problem was with the power pack. They would heat up after running a while and electronic components would quit working. After cooling off it would run again until it heat up. New power packs fixed the problem. Whoops, I see I mentioned this about 5 years ago. Sorry about that.

Thank you

I quoted and messaged the OP, hoping to see how it turned out for him.

Originally Posted by Zman

dose anyone know how to check a coil to see if it is breaking down and not fire?
it may start 10 times good ,then will turn over and not fire, any ideals? thanks for any help.

Did you ever find out what the issue was?

Thanks!