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Recent content by ba58smith

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    Yamaha Z150 (2-stroke) stumbles - contaminated fuel? Something else?

    My discussion with the guy at the shop raised another possibility - that the main oil tank level sender for that engine is acting up in rough conditions. Since low oil in that tank is supposed to put the engine in "limp mode", it's conceivable that the sensor is giving the low oil signal for...
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    Yamaha Z150 (2-stroke) stumbles - contaminated fuel? Something else?

    Took it to the shop yesterday, about a 30 minute ride on the water. Was hoping the problem would happen on the way there so they could witness it, and hopefully get some computer data on it, but of course, for the first time in over a month, it didn't happen, even in rough water. They're going...
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    2001 150 HPDI: what causes "safe mode" (aka "limp mode")?

    Well, I'm not sure what you mean that there's no "safe mode". Maybe you mean that the mode where the RPM won't exceed 2,000 isn't really "safe"? On my motors, when the oil gets low, I get an alarm, and the motor won't exceed about 2,000 RPM, and that's what I'm talking about. Regardless, you...
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    2001 150 HPDI: what causes "safe mode" (aka "limp mode")?

    One engine seems like it could be going into "safe mode" for a very short time while at normal cruise RPMs. "Very short time" = less than 1/2 second. Then it comes back to full power again, but not for long. I have done a lot of troubleshooting, that I won't get into here, because all I want to...
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    Yamaha Z150 (2-stroke) stumbles - contaminated fuel? Something else?

    The on-engine fuel filter cup had nothing in it but clean fuel. I did discover that the "water in fuel" float switch was not functional - the float was not moving freely up and down the shaft. But that certainly doesn't have anything to do with my stumbling problem. So now I'm out of ideas, and...
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    Yamaha Z150 (2-stroke) stumbles - contaminated fuel? Something else?

    I finished the fuel system plumbing upgrade, so now I can pull fuel for either engine from either or both tanks at any time. After that, I went out for a 90 minute test. Ran for over 30 minutes in smooth water without a hiccup, then took it out into some choppy water, and the problem started...
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    Yamaha Z150 (2-stroke) stumbles - contaminated fuel? Something else?

    Pumped out some fuel from every low point in the tank and found no indication of water or gunk in the tank. Then ran the boat in smooth water for about 20 minutes with no stumbling, but then it started. Slowly at first - just 100 or 200 rpm and for less than half a second. Then progressively...
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    Yamaha Z150 (2-stroke) stumbles - contaminated fuel? Something else?

    Well, no one is jumping on this, but I'll continue to post progress here to maybe benefit someone else some day. I changed the on-engine fuel filter (it wasn't especially dirty) and the Racor filter / water separator (no water in the bowl, and only a little of the "crud" in the bowl), then went...
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    Yamaha Z150 (2-stroke) stumbles - contaminated fuel? Something else?

    Sorry in advance for the long post - I want to give as much pertinent info as possible. I haven't had this boat very long. It has Z150 (2-stroke) motors, one from 2001, the other from 2004. The last several times out, the port engine stumbles badly when I'm trying to get to cruise speed, but...
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    Power trim SUDDENLY slowed way down (1999 Johnson 35hp)

    Power trim has always gone up and down quickly. Yesterday, suddenly, in the middle of trimming up, it got real slow. Now takes at least twice as long to go all the way up or down as before. I've got 12.8V on the input side of the relays (post 30), but I can't get to the connections on the pump...
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