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  1. Texasmark

    Best prop

    Maybe an inch or two higher. What I don't see is a planing surface on the boat. The hull is narrow first of all and second the bottom doesn't really have a flat surface. Get on the www and ask to see pictues of aluminum flat bottom John boats and look at that hull preferable from the rear...
  2. Texasmark

    Prop rubber rubbing

    How about you just taking a picture of the prop shaft and LU casting and then pictures of the old and new prop in the front view.....the view of that part of the prop that is closest to the LU....any hardware, washers and what all, include in the pics and explain when used. Another couple...
  3. Texasmark

    1957 evinrude fastwin 18hp ventilation problems.

    That's a good response and I agree not just on the not hacking comment, but if it's rated for 75 the 18 will be a dog.....get another engine like a 50 or so......with a 20" leg.
  4. Texasmark

    Lower unit or shift linkage issue?

    Something in your linkage must have come loose. The lower unit is pretty husky and freak accidents aren't common. As far as linkage, you aren't going to be in reverse and the boat moving forward. You may "think" you are by looking at your help controls but you aren't. Shift linkage is a...
  5. Texasmark

    1968 Mercury 100hp Water from upper exhaust openings

    When the engine is running and the boat isn't moving, the depth of the water at the engine is "back pressure" on the engine when it doesn't need any. The/those hole(s) at the rear of the mid section, near the top are called "Exhaust Relief Ports" and are there to relieve exhaust pressure...
  6. Texasmark

    Prop rubber rubbing

    You must have forgotten to install your tapered "thrust" meaning what the thrust caused by the propeller turning pushes against... "washer", rather than your lower unit casting.
  7. Texasmark

    1957 evinrude fastwin 18hp ventilation problems.

    Pay attention what Flying Scott said. I agree with him. That flat plate just above the prop should be visible from the front of the boat......get up front with it on the trailer, in the centerline look towards the rear of the boat and start stooping down. At some point you can see clearly all...
  8. Texasmark

    2016 Mercury Optimax 150 Pro XS Reviews?

    WOW. I though I might upgrade from carbs to injected but not for that price. Thanks for the tip!
  9. Texasmark

    Mercury ELPTO 115 burnt wires????

    Fist off a moot point. The 2+2 is a 2 cycle (stroke) engine with 4 cylinders. With speeds below around 1800 RPM there isn't enough fuel pressure to supply the bottom 2 cylinders with enough fuel to ignite and produce power. Above that "kick in point" all 4 (the other 2 kick in and) produce...
  10. Texasmark

    Fuel supply problems

    How about the check valve on the inlet line to the primer bulb. If it malfunctioned such that it didn't open it could collapse the bulb with the fuel pump sucking on the line. Have you tried putting things back together and see if it all magically works now. If so, with the troubleshooting...
  11. Texasmark

    76 Mercury 850 runs good on muffs but wont accelerat much past idle in water

    Engine will run on SF, big guns on here years ago attested to that. Idea in hitting the venturis with something combustible is that if the engine needs something combustible to put out the HP then SF will provide it and you will know you are lacking adequate fuel.....so you chase a fuel...
  12. Texasmark

    76 Mercury 850 runs good on muffs but wont accelerat much past idle in water

    Get yourself an aerosol can of Sea Foam...at any auto parts store. Get a helper to run the helm. Remove the engine cowl and try the hole shot (pedal to the metal) without spraying into the carbs. Get a data point. Spray a squirt into each carb and immediately hit it again. If it roars at...
  13. Texasmark

    Water pump tube seal

    Faztbullet would know...ping him.
  14. Texasmark

    Help with motor height adjustment

    Replace your trim relays. The Up/Down SP OFF DT spring loaded switch is controlling "signal" power (low wattage) to operate the solenoids in the relays. The relay/solenoid contacts do the work. If you were around in the days of ignition systems with points and condenser (capacitor) and...
  15. Texasmark

    Other causes for prop slip?

    They would have to be pretty bad and be in the "new water" area that precedes the prop.....but yeah it could, just like on boats like aluminum whose hull is stamped in two pieces with a "keel" along the bottoms center line to cover up the joint and are an aid in reinforcing it....they cause...
  16. Texasmark

    Other causes for prop slip?

    Your speed was measured how? Instrument, GPS? How do you know the tach reads accurate at idle? A 5% error on the instrument or your guessing it's correct at 650 idle RPM, if on the low side would reduce your apparent slip to 17%. A 10% would drop that to 13%. 13% could be expected out of an...
  17. Texasmark

    Outboard stalls when put into forward after reverse first

    The idle number you posted is Merc's idea of a number that will keep the engine running when going from N to F but not be so fast such that you get a "klunk" when you do it. You already told us that the engine is running as it should so rule poor engine tune/performance out. You are putting...
  18. Texasmark

    A little give on the shaft?

    Some Mercury engines have a built in "overrun clutch" built into the rear of F gear and the front of the "clutch dog" that rides on the Prop Shaft and is positioned along the prop shaft by the shift linkage, selecting FNor R gear. On these some Mercury engines, there is a sawtoothed...
  19. Texasmark

    Help with motor height adjustment

    I didn't include it here as I didn't look closely at your pictures but I like what I see. You have enough water over the AV plate to do what you want with that setup, for top end. rough water running, and pullinng water toys. At that height you have enough water over the prop to run about any...
  20. Texasmark

    Help with motor height adjustment

    If you want to spend some money on a prop, get the same number of blade as you currently running, SS with variable pitched, cupped blade tips and most importantly, high "rake". Expect it to load the engine more than your TP Hustler even though it has a lot of what I mention below.and you might...
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