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  1. jimmbo

    Points for a 1975 Mercury 7.5

    A Serial Number is the best way(and in some cases, the Only way) to get the correct Parts Listing for Mercs
  2. jimmbo

    Points for a 1975 Mercury 7.5

  3. jimmbo

    !976 OMC 5.7

    I guess they did use a SBC, I only remember the 235hp 351 Ford
  4. jimmbo

    !976 OMC 5.7

    235 HP?
  5. jimmbo

    !976 OMC 5.7

    In 76, I think OMC was using the Ford 5.8. Switching from the OMC Stringer will require extensive Transom Work(at least 10 layers of properly layed Fiberglass) as the Transom will be bearing the strain of the Thrust. New Holes for the Mounts will likely be required. You should get ahold of the...
  6. jimmbo

    Considering prop change. Seeking input.

    50mph from a 5.7 in a 25ft boat is asking a lot, maybe attainable with a Big Block. That engine has a WOT Range in the 4800-5200, so if 4200 is what you attain, then it appears to be over propped, or the engine is not up to snuff. Do what racer suggested, and/or some basic checks, like...
  7. jimmbo

    daily music fix

    I find Black Sabbath, Motley Crue, Iron Maiden, and AC/DC to be the Music that relaxes me, and relieves Stress. Rap, gets me to wanting to destroy Things, Violently
  8. jimmbo

    82 50 hp tilt and trim

    Looking at the Table of Contents, to me, it looks like a Selock/Clymer Manual. My Factory Manuals I would trust this manual far more...
  9. jimmbo

    17 vs 19 vs 21 Pitch?

    The I6 1500, was not known for great Low End Grunt, and was a cantankerous thing between 2000-4000rpm but between 4000-6000rpm, that motor could sing, on a light hull
  10. jimmbo

    STAINLESS OR NOT

    Neat thing about SS Props, is that don't shatter like an AL on an Impact, but they will keep hammering the Rocks, and bending/tearing the Blades, and bending Propshafts, and damaging other Parts of the Driveline This one caught an Underwater Cable. No Damage to the Lower Unit AL Mercury This...
  11. jimmbo

    17 vs 19 vs 21 Pitch?

    Did similar tests back in 76, with the old man's 90hp. Little or no Speed diff, just Rpm and Hole Shot changes Edit: In 72, put a much bigger Prop(pitch) on his 40hp, boat would barely Plane, so there was a big speed change
  12. jimmbo

    82 50 hp tilt and trim

    Have you got the Factory Service Manual? I used to have one for my Inline 6 and it had a Section for the Power Trim Systems. Included were Drawings of the Hydraulic Systems
  13. jimmbo

    82 50 hp tilt and trim

    Trailer Heater? Your motor is dropping, so what is with the Transom Button Kit? There should be plenty of 2nd Hand Parts/complete Systems available
  14. jimmbo

    Going straight at low speed?

    I/Os and Outboards have not only a Rudder(Gearcase/Lower Unit), they also have Directional Thrust. Very few Jet Boats, and PWC(aka Lake Lice) have any Rudder(some units have a very tiny protrusion), which is why if the Throttle is released. or the Motor dies, she ain't a steering
  15. jimmbo

    Going straight at low speed?

    Vee Hulls, especially I/Os do tend to wander, but a lot of it is from Over-correcting at the Helm
  16. jimmbo

    Testing thermostat with torch

    As in Boiling Water, yes. If you are thinking about a Torch, do so at your own Risk. Since you say it is a Warning Horn, it is likely just a Thermostatic Switch, not a Variable Resistance Device.
  17. jimmbo

    Acceleration problems

    Maybe, you have the Parts Motor, and we don't. Just out of curiosity, what Manual are you using?
  18. jimmbo

    Testing thermostat with torch

    I don't know where you learned Electrical Theory, but yes
  19. jimmbo

    Testing thermostat with torch

    Since the Pump is missing a lot of Material, who knows where the stuff is residing. As for the Temp Sensor, that head must have got quite hot for it to pop out like that, or someone took it out and didn't reinstall it properly, as it does look cross theaded. Remove it and examine the Threads, of...
  20. jimmbo

    17 vs 19 vs 21 Pitch?

    Any difference in Top Speed, will be low, far less than 5 mph. Any Idea what Make and Series the current Prop is and how old is it, and is it cupped?
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