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  1. 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...
  2. 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.
  3. 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...
  4. 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...
  5. 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...
  6. 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)...
  7. 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...
  8. 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.
  9. 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...
  10. 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.
  11. Texasmark

    tell tale

    A couple of idle comments on this unusual (to me) post. How the muffs fit surely affects performance, as does water pressure. With a properly fitting set and adequate pressure the flow should be better since there is no lift requirement....pressure preloads the impeller. Once the engine...
  12. Texasmark

    60's OMC small hub large hub props

    What appears to be in your hand?
  13. Texasmark

    Are press-in rubber hubs still obtainable?

    Back in the '50s for a period, You had Mercury and OMC. Mercury used a splined prop shaft/prop interfacing pressed in, rubber slip hub (had one of those) that would allot the prop to hit an object, break loose from the prop casting proper and upon the operator reducing the RPMs to idle, or...
  14. Texasmark

    Where do you like to prop your boat?

    On where, I prop 2 strokers at the top or a tad above depending on the engine. On 4 stroke pushrod engines I would probably set it in the midrange with the average load carried in the boat. Doing what you suggested will improve you hole shot and get up speed for water toys.
  15. Texasmark

    Are press-in rubber hubs still obtainable?

    Yes they are still available. I bought a new Solace 4 blade, 13+x19 SS just this year.....at a great price.
  16. Texasmark

    60's OMC small hub large hub props

    Yepper that was a fat 50 if a '59 yearmodel. You had to be in an aluminum boat, 12-14', and very young (light weight) in my opinion to even get up with a 9.5...maybe sitting on the pier and getting jerked off to get up.....yes, no????
  17. Texasmark

    60's OMC small hub large hub props

    Your numbers are normal for the prop change you mentioned. Dropping pitch gives better torque (for getting water toys up and going, pushing heavier boats) but reduces speed and increases RPMs usually. OMC went with 4500-5500 RPMs WOT range for many years with the rated HP at 5000. They had...
  18. Texasmark

    Reverse gear and bearing

    I never did it on that engine but the only thing I would do would ensue the shifter is in N or F and you rotate the crankshaft as you push the carrier into position, ensuring that the gears find highs and lows synchronously and not get high centered on 2 peaks....if that's possible...if the tips...
  19. Texasmark

    115 Pro XS Command Thrust on a pontoon - prop?

    Well the Go Fast prop slip calculator says that your 4 blade is yielding a 37% slip and your 3 blade a 19% slip. Large diameter and shallow pitch are the traits of a pusher prop and being shallow in pitch means that RPMs will usually be up which yours are. Per DC Wilsons comment it seems you...
  20. Texasmark

    Prop noise 1200-2000 rpm

    Swag. Your TP probably is ported...holes under the leading edge of the blade designed to allow exhaust gasses to flow across the blades in the hole shot allowing for fast RPM increases and faster HP development which gives you a faster shot. The air/exhaust gas across the blade could allow for...
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