Re: 2002 Yamaha 4-stroke 115hp
I have a 2001 Mercury 115 four stroke(Yamaha Powerhead) that was doing the same thing two years ago. Started happening in June and didn't figure it out until November. Ended up being a "defective main relay".
Under warranty, the dealer did a lot of parts swapping, cleaned my injectors twice, cleaned internal filters, new injector pump, blamed it on my fuel system set-up. blah, blah.
The problem never showed up on any of the diagnostic equipment that my mechanic had. It would cut out only at certain temperatures(as the motor was getting warm) but once it got fully warmed up, problem would go away until it went through that certain temperature range again.
Expect this problem to become more frequent but at least it restarts pretty easily(doesn't it?).
Keep this post in mind and try this if all else fails.
And one more thing, this relay won't cost too much compared to other parts you may be replacing.
Hope this helps,
Scott
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"Somebody put salt in the ocean to punish us boaters"
1989 22' Bayrunner Cuddy (Aluminum)
2001 Merc. 115 Saltwater Series Fourstroke
1988 Yam. 9.9 High Thrust Fourstroke
1998 Dodge 2500/ 24V. Cummins diesel
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