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  1. Texasmark

    Yamaha VF115 SHO prop quote

    The 4 blade got me off the limiter so the 3 blade must have been right there.
  2. Texasmark

    Prop Blade/Pitch/RPM

    According to go fast prop slip calculator if your 115 is like most witha 2:1 gearbox...prop turns half the speed of the crankshaft, your slip...the difference turning in water vs a screw turning in wood is: 19 = -4; 21 = 0 (the screw "is" turning in wood; 23 = -4 also. Common denominator here is...
  3. Texasmark

    Replacement prop

    I will add an additional comment to what I posted previously. A ported prop like the Laser II can function as both simultaneously.The ports allow the engine to unload at slow speeds, making for a great hole shot with a high pitched prop tuned for the top end, yet at the high end they close off...
  4. Texasmark

    1968 Fiberform 16 foot with Homelite 55

    Absolutely an incredible find and to hear that it fired right up and all the nice pictures to validate your comments. Back in the 1965-68 time line a friend of mine bought one on a 15' fiberglass boat. Went fishing with him one time and he let me drive it.....super fine engine. I think I...
  5. Texasmark

    Yamaha VF115 SHO prop quote

    Go to the top of the page and under parts go to props and fill in the blanks and a list of applicable props will show up. I ran your posted RPM numbers assumning the F gearboxes are equal to 2 strokers in that hp range....but just speculation...... and you have something tangled up...
  6. Texasmark

    Prop Blade/Pitch/RPM

    Back in 1972 I bought a new Johnson 125, power tilt only...trim came out in 1973, on an 18' Caravelle FG bow rider, tri-hull.....heavy boat with probably 15* of dead rise at the transom. I had a 17P OMC SST prop...their first SS prop, Teflon coated, the second year (1973) as they came out that...
  7. Texasmark

    Yamaha Trim Tilt Constant Ground?

    If like others the relay has to be DPDT, 2 are required and they are complementary wired....you have to activate/deactivate both to get power applied to the motor and depending on whether the blue or green wire has the relay energizing current, will determine which pins on which relay are...
  8. Texasmark

    Forward and reverse help!

    Define "both hooked up". What's unhooked...HV lead off the spark plug? Does RPM have anything to do with the problem? If it works at low RPMs and not at high then I could support the dirty terminal (either supply) theory, but some modules get their ground through the mounting screws. Some...
  9. Texasmark

    Mariner 90hp 3 cylinder 2004 - Bogging Driving Me Crazy

    I usually try to isolate it to fuel or fire when it acts up. Fuel is a squirt of Sea Foam into the venturis of the carbs checking for a response or not. Fire is checking to see that the plugs are firing, like running with the cowl off and a timing light attached to each (in series) spark plug...
  10. Texasmark

    1998 Mercury 225 slipping at high speeds

    I have no experience with 200 HP engines but I have run the "Pad" and have experienced "Chine Walking" from exceeding the boat and setup parameters speed limit, also "Blow out" from too much trim, and "Ventilation and then the prop grabbing" caused by air induced ahead of the prop, like a keel...
  11. Texasmark

    1994 90 HP Mariner/Tracker Surges and bogs on plane/WOT

    On clamps or no clamps, Mercury uses a spacial tie wrap that has a curve in the inside of the female part allowing for 360* compression of fuel lines. If you are talking about lines preceeding the fuel pump, it could matter and no visible fuel leakage around the hoses. If down stream of the...
  12. Texasmark

    1998 Mercury 225 slipping at high speeds

    What "rubber" washer at the prop? If a pressed in rubber hub it encompasses thewhole space between the splined brass center and the "shell"....no washers in the prop area. could be slipping but not not with the indications you mention. You didn't mention if you could correct the problem...
  13. Texasmark

    Replacement prop

    Hard to get all that in one package as what optimizes on one hand is a detriment on the other. Going to SS usually puts more load on the engine because they are usually built "to grab and hold onto water". I'd expect to drop at least an inch of pitch and expect an increase in speed of a few...
  14. Texasmark

    Throttle trim

    Or the switch is bad. One quick way to check for chafing problem is to run the throttle/shift lever from WOT Forward gear through N to WOT R (remembering to turn the prop in shifting to R without the engine running so that the clutch dog in the LU lines up with R gear and seats properly) and...
  15. Texasmark

    Help replacing key switch in ‘75 Mercury 500

    If you don't get a reply it's because your post wasn't seen or nobody seeing it knew.....answer it yourself with the word "BUMP"....bump it bact to the top for another run. Repeat if necessary. Somebody on here knows, like Faztbullet usually knows since he used to race engines built in the...
  16. Texasmark

    DVA stator testing

    copper temp coefficient....cold morning low resistance.
  17. Texasmark

    90hp mercury fuse/rectifier problem

    16 Amp Red Stator: Restance between yellow wires at 25C is between 0.16 and 0.19 Ohms...don't forget to touch the leads together to measure the lead resistance...on my meter it's 0.4 ohms so my readings would be between .56 and .59 ohms. Both leads infinite resistance to engine block...ground...
  18. Texasmark

    DVA stator testing

    #1 looks normal #2 looks like water is getting into the cylinder. Move each cylinder's piston to or near TDC and looking through the spark plug hole, compare each. If #2 looks new and carbon shows up on the others you have a water intrusion problem. #3 is obviously fouled "In my opinion since...
  19. Texasmark

    DVA stator testing

  20. Texasmark

    Low RPM but good performance

    The engine service manual gives you the poles. The tach comes with instructions for the number to set for the number of poles. All tachs aren't in English....aka they don't have a 12 position for 12 poles and 6 position for 6 poles....they have a code you have to use ...in the...
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