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  1. Texasmark

    Prop pitch and diameter

    13+ is the right diameter range for that lower unit which has a gear ratio of 2.33:1. A 19P on that engine on a light boat/light load isn't enough pitch regardless of how sophisticated the prop design. My 90, pictured in my Avatar was a SS Ballistic 13+ x 24 XP (added blade area) and it...
  2. Texasmark

    Upgrading from 70hp to 90hp

    Wide beam is a big plus. 20", not 15" transom engine mounting height is also a big plus. Moving some weight forward can help to mitigate the extra weight....side console vs tiller steering is another big plus....would think that is how your boat is arranged. If you had a front deck with...
  3. Texasmark

    Mercury 1968 200 20hp prop

    ".......the best of the best". Maybe not necessarily in coloring but the red band 125 tower of power could outrun my 125 '72 Johnson on the same boat essentially......that was back when I was an OMC guy.
  4. Texasmark

    Mercury 90hp 3 cyl 2 stroke 1995 - rebuild

    In my Service Manual's spec. section: Bore diameter standard: 3.50" Taper/out of round condition (fail point) 0.003" (3.503") Piston diameter standard: 3.495 0.015 oversized: 3.510" 0.030 oversized: 3.525" That doesn't exactly answer your question but should get you in the ball park of...
  5. Texasmark

    Correcting gear ratio with prop size

    Yeah but adding Ground helps one get the idea as to what it actually does, not what it is....grin.
  6. Texasmark

    Slipping out of gear when speeding up

    In marking the prop mark a straight line from the ID Spline to the OD barrel of the prop. If the line is not still straight after testing, hub is slipping....just clarifying a suggestion above so that the line connects the right places. On the slippage, I know not the history of your usage...
  7. Texasmark

    Correcting gear ratio with prop size

    GPS: GROUND Position Sensor!
  8. Texasmark

    Combining starting and deep cycle batteries

    Same thing applies to the voltage level at "full charge". The different type of battery will have a different "full" voltage and could either not get fully charged, or you'd boil the electrolyte out of the lower voltage battery while the higher voltage battery is telling the charger to keep...
  9. Texasmark

    Motor won’t shut off.

    From memory but could go out to the shop and verify colors in the Service Manual: Pull a connector off a CD Module and identify the yellow/black or black/yellow wiring harness (not CDM) pin/socket...forget sex of WH connection. Take an Ohm meter on the lowest scale and touch that pin and the...
  10. Texasmark

    1972 Cathedral Trihull Prop Size

    No biggie. Mark the crankshaft and one of the blades on the prop. Put it in gear and rotate the engine until the prop has made 360*. Note the position of the mark on the crankshaft pulley. 1.65 means that the engine had to turn 1.65 turns for the prop to turn once. .65 x 360 = 234* For...
  11. Texasmark

    Help with 75hp mariner

    Service manual states that with cranking compression below 120 PSI, taken correctly, expect problems.....you are a long way from that sir!
  12. Texasmark

    Looking to add tilt steering to my outboard. Need some Clarification on parts needed

    I have a 2002 Crestliner 1750 Fish Hawk dual console and I had their OEM steering. I don't remember a lot about the tilt purchase other than buying the rotary (vs rack and pinion) that was in my boat already. I don't recall where I bought mine or any show stoppers.....never did something like...
  13. Texasmark

    115 2+2 High Idle

    Great news. Never know what you'll find troubleshooting equipment!
  14. Texasmark

    Any help til trim switch

    The x8 series were OMC low cost engines. At 50ish HP and being a low cost model, expect it to be absent. If it had trim, you would see the ram and pump between the transom brackets.
  15. Texasmark

    Can I switch out Mercury 9.9 kill switch?

    Texas P&W Service, (the water cops) says that you need to have a kill switch connected to a lanyard that is attached to your body when operating your boat in Texas waters......check your state laws.
  16. Texasmark

    1986 115hp inline 6

    The engine is water cooled, not air cooled. I answered the blanket question elsewhere on today's forum www or on another which I frequent together with this one.
  17. Texasmark

    1986 vs 1999

    Case in point, Mercury 2 strokes of the late 90's and early 20's, per the service manual, as an example the manual lists verbiage for 60 thru 125 hp. The 60 hp model is a 75 hp with a Jet LU to give you the example of the available power not counting the efficiency, and probably lack thereof, of...
  18. Texasmark

    Inline 6 Sound Blanket

    The sound blanket was made of loose weave, like scattered hay, stiff but loose, could compress if you squeezed, would spring back when released. It was about 1" thick, completely covered in plastic to prevent intrusion of liquid components of different types. It lined the center removable...
  19. Texasmark

    1996 Mercury 75 hp prop

    I know this is later than your fixing your problem but rev limiters like I have on my 2002 115 2 stroke can give you the wrong answer as you found out. Had you not had the rev limiter your RPMs with your 15P would have had revs over the upper limit of 6k RPM.....I'd bet. Then it would have...
  20. Texasmark

    Speed Plateaus at 5200rpm

    You need to remove the prop to see whether or not the hub has slipped, monitoring YOUR scribe line connecting the splined hub to the outer barrel. Glad you made it back on here.....the saga continues. Good luck.
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