Recent content by AKriderK9

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    Carbureted f50 power increase.

    I have a carbureted 1998 Yamaha f50 4 stroke and I have been told it can be upgraded to a 70 by removing a restriction plate? This sounds very similar to the old evinrude’s where you could convert a 9.9 to a 15, 25 to a 35, 40 to a 55, 90 to a 115 ect. I also know the EFI Yamahas can be...
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    1998 Yamaha 50 4 stroke not starting

    Well, racerone set me on the right path! Broken flywheel key that had my motor 75° retarded. New key and she fired right up. Ran great! I just got the motor a few weeks ago, so I had only ran it once before all this. I will need to play with pitching now, it’s on an 19’ fiberglass boat and was...
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    1998 Yamaha 50 4 stroke not starting

    Compression was right around 130 cold, according to Yamaha anything over 122 cold is fine
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    1998 Yamaha 50 4 stroke not starting

    What am I checking on the flywheel key? Isn’t that in a slot on the crank shaft? I checked timing after fighting for an hour to get it started. At idle, spark was sitting at 5°.
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    1998 Yamaha 50 4 stroke not starting

    Also, like I said, it will pop, but won’t fire, kinda just coughs, but does not run. Just figured I’d clarify what I meant by “it pops”
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    1998 Yamaha 50 4 stroke not starting

    So, have a 1998 Yamaha 50 hp 4 stroke. It ran great once….. went to start it, and it took over an hour to get it to run. Now, I can only get it to pop. Here’s the rundown of all I’ve checked….. Compression is good, all cylinders within 2 psi of each other. Rebuilt carbs Replaced all fuel...
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