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  1. Texasmark

    Mercury vs Evinrude Interchangeability?

    LAMO, years later finding out just why my OMCs were eating dust....er ah wake......but it sold engines and he didn't have a problem dyno testing his engines and meeting spec!
  2. Texasmark

    125 hp on an 18 ft tri hill

    The real answer to proper prop height has to do with numerous things and usually has to be "tweaked" to get optimum performance. Normally boat mfgrs. setup their transom for 15, 20, 0r 25" skeg lengths on the outboards which will be attached. Considering that your hull shape at the transom...
  3. Texasmark

    Exhaust smells like paint thinner

    I bought some freshly delivered to the retailer 91 octane gasoline the other day and while filling my 5 gallon cans, the fumes just plain stunk. Never smelled gas that smelled like that.
  4. Texasmark

    Mercury vs Evinrude Interchangeability?

    Well back in the 1950 era plus and minus, OMC prided itself on "quiet" operation while their Mercury counterparts were blasting by them making all sorts of racket.....I was an OMC guy back then, getting passed by green and grey Mercs, but years later recovered my sanity. My current Mercury is...
  5. Texasmark

    125 hp on an 18 ft tri hill

    Here it is right here: https://forums.iboats.com/threads/prop-hight.752047/ Just in the Non-repair Outboard Section under a different title.
  6. Texasmark

    125 hp on an 18 ft tri hill

    Funny, the day you posted this I went to my archives and found that I had provided at least one lengthy reply to your Avatar on this subject because I bought a new 1972 18' Caravelle open bow tri-hull with a 125 Johnson and elaborated on the performance including a trick we performed at a...
  7. Texasmark

    Vibration TurningPoint 4 blade

    I have a couple in the 13" diam. range, in 17-19P. I did expect vibration considering the two types of blades but didn't notice any.
  8. Texasmark

    Is on deck fuel tank legal?

    Well back in the day when smaller outboard boats had a couple of 6 gallon tanks for fuel, they weren't really on deck, more like under the deck. I suppose with a CC and inadequate space under the console, one might opt for on deck storage. Ask the water cops seems to be the right answer....on...
  9. Texasmark

    Gas tank size

    I had a 1972 18' Caravelle tri-hull with an 18 gallon tank if that helps.
  10. Texasmark

    125 hp on an 18 ft tri hill

    What happened to your original post on the subject?
  11. Texasmark

    Painting Aluminum

    Aircraft alum. parts get Alodine which is a chemical etch of the surface....and Zinc Chromate is a primer paint for aluminum. I never Alodined large parts as the process was to dip a raw component in a solution for a period of time, let the acid cut into the surface and remove. ZC on the other...
  12. Texasmark

    Prop hight

    I thought so too. That's why I tossed in my experience. Should be right on the money.
  13. Texasmark

    Who has installed Helicoils ?

    It will work better because it's SS not cast alminum and its slicker so it's easier to get the correct torque....like wet and dry thread torques on bolts.
  14. Texasmark

    Prop hight

    In 1972 I bought a new Johnson 125 on an 18 ft. FG Caravelle open bow, tri-hull with a good amount of dead rise all the way to the transom with relatively heavy construction for a really nice comfortable ride. The engine sat on the transom (PTT wasn't available for engines till the following...
  15. Texasmark

    Engine Re-power

    .....as long as its getting adequate fuel.
  16. Texasmark

    Who has installed Helicoils ?

    I'd do the work Matt recommended and then install whatever length you have and when finished take a 4 or 4 1/2" cut-off wheel and trim to fit. The usual practice is to knock the tang off the bottom after insertion but since you are bottoming out seems like a moot point. Another option is to...
  17. Texasmark

    Fore & Aft Play In Prop Shaft ?

    Well maybe you don't have an overrun clutch.....according to Faszbullet some engines don't have one.....I can't imagine that but what do I know...... I am not familiar with your boat. Go to a dealer of your boat and do the test I mentioned on new boats then worry about it if different!
  18. Texasmark

    3 Blade or 4 blade prop?

    I bought my first boat as a junior in high school in 1958. I've been boating ever since. I learn something different on every outing I have enjoyed (or otherwise) over the years. You never know it all......
  19. Texasmark

    Pontoon prop

    Guessing the Big Foot gear ratio at 2.33 if your BF is using the standard LU that comes on the 90 hp engine.....if not correct it in the equation and move on. You didn't say how far above 6k it runs at WOT....guess on this 6500 for a number. Assume your prop slip to be 20 %...have no idea as...
  20. Texasmark

    Which deckboat 17-19 foot

    Build yourself a shell covering out in the yard. A tri hull pontoon, referred to as a "Tri-toon" can be had with a 300 HP engine and do 65 MPH if that's your cup of tea.....and there is a place for the "head" (potty in nautical terms).
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