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  1. 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...
  2. 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...
  3. 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...
  4. 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...
  5. 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...
  6. 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...
  7. Texasmark

    DVA stator testing

    copper temp coefficient....cold morning low resistance.
  8. 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...
  9. 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...
  10. Texasmark

    DVA stator testing

  11. 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...
  12. Texasmark

    I have 1999 Mercury EFI 150 and the bottom end has clunk when accelerating not every time. Also the rpms have increased from 5200 to about 5800 .

    The rear of F gear and front of the clutch dog are sawtoothed. The driveshaft drives the F and R gears simultaneously and neither are connected to the prop shaft via the clutch dog in N gear. The sloping part of this sawtooth is your overrun clutch and allows the engine to run slower than the...
  13. Texasmark

    DVA stator testing

    Since you are dealing with electromagnetics and the energy comes from a fixed magnet on the flywheel, V = L di/dt. L is fixed in the windings and core of the pickup coils and the electromagnets embedded in the flywheel. Di/dt is your rate of charging which increases as RPM increase (since time...
  14. Texasmark

    Fuel connector compatibility issues.

    I bought a new gas tank a couple of years ago and it had a funny connector on it. Since I was in WW, in the Sporting Goods Dept., I went over to the marine nick-nack rack and lo and behold was a mating connector and the fuel line tube was sized for 5/16" adequate for I engines or 3/8 for V engines.
  15. Texasmark

    Low RPM but good performance

    Your tach says you are way high in your prop pitch....your hole shot says you are fine with your prop pitch. 70 HP isn't a lot especially a Yammie (opinion due to cubes) on your rig but 15 isn't a lot of pitch either. I'd say it's doing a fine job. I'll check your tach for you...guessing your...
  16. Texasmark

    Through hull transducers

    I currently have aluminum and have had several boats including glass with the ducer mounted inside near the keel and just forward of the transom. A good bubbleless epoxy and push the ducer down till in it till it squishes out the side and hits bottom. I'm running 2 of those birds you...
  17. Texasmark

    Bay boats offshore

    I don't fish offshore but have encountered significant sized waves....hiding the boat from the horizon occasions, and wave length that allowed the boat to sit level for several seconds, in the trough, before changing direction. My choice, were I to go out today would be deep V and high flare...
  18. Texasmark

    SHIFT shaft removal.

    I really doubt it is bent unless somebody, at one time used undue force to get the LU and midsection section mated. The diameter to length ratio is too big. I'd be more apt to look at the shift rod in the midsection. The interface is tight and the splines have to be lined up exactly....may be...
  19. Texasmark

    Forward and reverse help!

    My experience with the Merc LU shifter is that the relaxed position of the shift mechanism is that the spring loaded "cam follower" on the front of the prop shaft is the farthest forward, relaxing the pressure on the spring behind it on the prop shaft. The cam follower follows 3 detents in the...
  20. Texasmark

    Profiling change

    That worked, thanks.
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