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  1. Texasmark

    Is My Mercury Prop Spun?

    Other than the binding problem, how did it perform?
  2. Texasmark

    Is My Mercury Prop Spun?

    I/m guessing that your gear ratio is 1.76 on that engine. Here is where you are: https://www.go-fast.com/Knowledge-base/Find-your-prop-slip/Prop-slip-calculator Something isn't right.....way too much slip as you should be up around 55...
  3. Texasmark

    1985 Mercury 85hp (4 cyl) runs great for 20 minutes then boggs down

    Moving right along. Marine carbs these days are real simple. The moving parts are the low speed adjustment screw, float and needle valve. The adjustments are the float level....usually with the carb inverted, the seam on the float is parallel with the top casting mating flange. The low speed...
  4. Texasmark

    Drain plug confused

    I had to laugh at your "Sheer Pin" comment. Back in the day my boating circles called the pins "Shear Pins" also since they sheared at the most un-opportune moments....course anytime wasn't wanted. Optomistically the OEMs referred to them as "Drive Pins".
  5. Texasmark

    1985 Mercury 85hp (4 cyl) runs great for 20 minutes then boggs down

    Get one that attaches to the battery for power, vs one that plugs into an AC wall socket. Get a helper to drive while you sit by the engine and monitor the spark. When connecting the high voltage clip, observe that the direction arrow on the clip, points toward the plug as indicated. If the...
  6. Texasmark

    Engine Re-power

    You must have lucked out with your prop selection. Having 200 additional pounds of weight at the transom is surely a force with which to recon on hole shot or getting skiers up and on the water. Glad it worked for you.
  7. Texasmark

    '94 Bass Tracker handling question

    Your biggest problem will be getting pounded to death if you are in any kind of chop and are running at any kind of speed...my last boat was like that, 17 1/2' Fishmaster with a 90 Merc......pictured in my Avatar. In big water just slow down and keep the bow up, finding the approach angle that...
  8. Texasmark

    Drain plug confused

    I had a 1960s 14' Taylor Craft fiberglass open runabout of identical construction. It differed from your boat in that there was a plug at at the bottom of the transom into which a "thermos bottle" plug (common drain plug) just above the deck for draining the interior of the boat either underway...
  9. Texasmark

    Prop Question

    If you are happy with your current prop other than a sloppy hole shot, Adding ports (probably 3/8") under the leading edge of the blades (prop shop chore) will certainly help, or find a ported prop with the closest resemblance to your current prop and if you buy a Mercury prop you can get rubber...
  10. Texasmark

    35 hp johnson one cylinder no compression

    Yeah. Take the top plug back out and retest the bottom cylinder....if it reads good you didn't have a good seat on your gauge or it malfunctioned... pressure release button stuck.
  11. Texasmark

    1985 Mercury 85hp (4 cyl) runs great for 20 minutes then boggs down

    You hit the topics I would have recommended. I think you have isolated it to a spark problem. So the question becomes, what is in the ignition circuitry that hasn't been replaced that could be temperature sensitive and repetitive (exactly) in nature? A bad ignition switch is a possibility if...
  12. Texasmark

    Where do you like to prop your boat?

    If the going gets rough due to high waves or hull design that doesn't support soft riding, she probably doesn't like getting "things" bounced around. I had that problem with my wife. I traded boats and never heard another squak out of her.
  13. Texasmark

    Need Help From You Guys That Have Prop Efficiency Calculators

    Most aluminum props don't have trailing edge cupping...tip is bent slightly. This is a huge asset in "grabbing" the water and is especially noticeable on props run close to the surface like is the case on fast Bass Boats. SS props are usually cupped and have enhancement characteristics for...
  14. Texasmark

    Need Help From You Guys That Have Prop Efficiency Calculators

    https://www.go-fast.com/Knowledge-base/Find-your-prop-slip/Prop-slip-calculator This is a shot of a 2:1 gear ratio running a 14P prop at 5500 RPMs. The first result is the speed obtained if the prop were like a screw turning in a piece of wood. The last result is due to water not being a...
  15. Texasmark

    Water Pump Issues

    I don't know. Maybe Dave is onto it. A weak spring on the poppet might be causing the problem....doubt the stat would do that due to the different mechanical design of the two valves. Maybe the long term sitting up caused the spring to weaken, or the rubber seal may have softened and when the...
  16. Texasmark

    Does a 06 EFI 60 need a primer bulb???

    Yes, an electric fuel pump. I just installed one in my engine (different than yours) because I installed a water separating fuel filter and with the plumbing and all I wound up with minor starvation problems.... Prior to installing the filter (just because I though it would be a good idea)...
  17. Texasmark

    Water Pump Issues

    You may be seeing your thermostat opening and closing. The stat controls flow below about 2500 RPMs (published number). Above that, water pressure forces the poppet off its seat allowing for full flow through the powerhead. The stat would cause variations. The poppet would be a solid...
  18. Texasmark

    tell tale

    Ok how about "consuming" for a word. Also the pump goes from a displacement pump at low speeds to a centrifugal pump (blades bend back....written in engine literature) at high speeds. Displacement pumps have the capacity to suck.....to some extent, depending on the setup and pump.
  19. Texasmark

    Propeller size for 1977 mercury 1150

    You didn't say what length. BW www site (https://www.bostonwhaler.com/boat-models/montauk/170-montauk.html) shows a performance curve with a 115 and 90. I'd think that your 17P with the 2:1 gearbox would work very well. Go fast.com prop slip calculator numbers with the speed as posted on the...
  20. Texasmark

    Short Shaft to long Shaft swap

    ....and drive/shift shaft lengths. I'd think you are looking at replacing 3 parts as mentioned....housing and 2 shafts. Finding a suitable engine with a blown powerhead at a repair shop junk pile might be just the thing for you.
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