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  1. J

    Are Yamaha fuel filters universal?

    Deleted.
  2. J

    cupped prop question

    If you go past the power curve you waste fuel. I see with my boat, my truck and my airplane. Staying on top of the power curve will cost speed but save fuel. I haven’t crunched the numbers for the Yamaha F70 but my truck gets 15-17 mpg at 75 mph, 20-21 at 65 mph. The boat acts the same way.
  3. J

    cupped prop question

    Fuel efficiency takes a pretty big hit when max torque falls off as well.
  4. J

    Mismatched surge brake components

    I don’t know weight range of your boat but it seems like a lot of 21’ and smaller ski boat owners and most pontoon boat owners around here just disable the system rather than repair them. I know of a couple that were disabled simply because the owners couldn’t back them into the yard without the...
  5. J

    Stainless Steel Rowboat

    I think that is backwards. Magnesium is less dense so the same amount would be lighter.
  6. J

    Best way to mount bunk boards

    I haven’t had any trouble with ski boat bunks nor bass boat bunks. Pontoon boat trailer flex a lot more so the lag bolts can get ripped out. I would use the through boat idea if I had to fix another one. I couldn’t get bunk carpet locally even though the local lake is the largest in the state...
  7. J

    Any clue what this gunk is?

    If water can get in then oil can come out, especially if there is enough water is getting in to push the oil out. I pulled a gear case a couple of years ago because of an oil slick in the slip. The gear case had way more water in it than oil and was floating oil out a bad seal on a top fill plug.
  8. J

    2021 Merc. 115hp CT, sputtered again running about 4000 rpm?

    Ahh, the joys of having an intermittent problem! That would be the dongle I mentioned. I don’t recall what Mercury calls it. I always wanted to try one but couldn’t ever figure out how much maintenance info it could provide to me. We are moving away from the lake so I’ll probably never work on...
  9. J

    2021 Merc. 115hp CT, sputtered again running about 4000 rpm?

    I don’t know that any of the 4-strokes “need” the primer bulb but they are nice to have for troubleshooting and the rare occasion where there isn’t any fuel in the line. I have never liked running fuel pumps dry. Most I have worked on won’t tolerate it and are marked not to do it. I have not...
  10. J

    2021 Merc. 115hp CT, sputtered again running about 4000 rpm?

    I agree with filter issues tend to be more consistent. Fuel pickup screens can get restricted and unrestricted as debris floats around the tank. The primer bulb should collapse if that is the problem. I had a bad spark plug cause an intermittent problem on my Yamaha. It wasn’t until after I...
  11. J

    2020 150hp possible fuel related issue

    The only fuel filter I can think of on a Mercury 150 EFI isn’t visible. It’s accessible via yellow handle on the right side of the power head. PITA. It uses press-to-connect connections which helps with installation but can be a challenge to disconnect, especially the outlet hose.
  12. J

    2021 Merc. 115hp CT, sputtered again running about 4000 rpm?

    The only fuel filter I can think of on a Mercury 150 EFI isn’t visible. It’s accessible via yellow handle on the right side of the power head. PITA. It uses press-to-connect connections which helps with installation but can be a challenge to disconnect, especially the outlet hose.
  13. J

    2020 150hp possible fuel related issue

    This kind of reminds me of an issue we had on a 150 EFI a few years ago. It took someone really good with the diagnostic computer to identify the throttle position sensor as the culprit. He tried to walk me through the numbers and their relationships on the screen but I wasn’t tracking any of it.
  14. J

    Stuck oil filter

    The Craftsman oil filter wrench is about all I use anymore...
  15. J

    stupid question - trailer lights

    Sealed heat shrink, sealed solder sleeves, crimp connectors with attached sealed heat shrink, and all the other fancy products available are all good products that not everyone has quick access to. The key is to seal the connection. Just putting silicone on cheap crimp splices (I refuse to use...
  16. J

    stupid question - trailer lights

    I had to do some wiring maintenance on my current boat trailer a year after I bought it. Haven’t had to mess with it since (11 years). The trailer it replaced needed half of the “waterproof” fixtures replaced during its first year, just before it was stolen at the boat ramp.
  17. J

    stupid question - trailer lights

    I always unplug the lights when dunking the trailer. When I was a kid a wet trailer shorted out my Dad’s truck. Later in life I had 2 incidents where a wet trailer shorted. One of those was a wire shorted to the frame and the other was a bad fixture. I pay more attention these days so most...
  18. J

    stupid question - trailer lights

    The exposed pin on the car side should be the ground. Check for voltage at other pins against it. If that works then the trailer ground is the first place to look when nothing works. I have also had the fixtures lose ground individually along with badly corroded bulb sockets. Maybe the most...
  19. J

    What's the best concert you've been to?

    Tough call. AC/DC Blow Up Your Video tour was pretty good but so was Guns and Roses opening for Aerosmith. Hard to discount the Brooks and Dunn Neon Circus too. Johny Cash, Alabama, Van Halen, Santana, White Snake… we attended a lot of concerts when it was just $20 a ticket for decent seats. All...
  20. J

    Intermittent starting

    Battery is not a bad guess but I have never seen an intermittent battery. It will be a connection issue of some sort and it will be something both motors have in common unless there are 2 identical problems on both motors. I once owned a 1974 Cherokee. It was having some intermittent starting...
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