Thread: Yamaha VMAX OX66 fuel injection 225

I have been a certified outboard tech for almost 23 years and I have seen very few electrical problems with Yamaha and almost no bad coils. I'm not saying they don't happen but they are very rare. What are the symptoms with the motor? The first thing to do is check the compression. If that is good then the problem is usually in the fuel system.

Originally Posted by Bullet101

I have been a certified outboard tech for almost 23 years and I have seen very few electrical problems with Yamaha and almost no bad coils. I'm not saying they don't happen but they are very rare. What are the symptoms with the motor? The first thing to do is check the compression. If that is good then the problem is usually in the fuel system.

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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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.