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  1. jimmbo

    1960s Evinrude Sportwin Model?

    It has a 1963 cowl on it. It does have a thermostat Pic gets bigger if clicked on
  2. jimmbo

    Props for OMC 15

    That doesn't look like any jet drive I've ever seen for an outboard, this thing, whatever it is, retains the stock lower unit and adds an enclosed impeller with a lot of added drag, with none of the shallow water benefit of a jet drive This what every jet conversion pump I've ever seen looks...
  3. jimmbo

    1966 Johnson vs newer models with flow through exhaust

    It is comparing apples to oranges 1966 20hp@4500rpm 22 cu in 4000 - 5000 rpm 21:12 gear ratio 9" - 9 14" dia props snout exhaust mid 80s onward 20 hp@5000 31.8 cu in 4500 - 5500 rpm 28:13 gear ratio 10" - 11 1/4" dia props thru hub exhaust The non thru hub props were better when the engine...
  4. jimmbo

    Neutral prop spinning

    Both systems use a 3 button control Does the cowl look like this? 1968 Or like this? 1969
  5. jimmbo

    Another prop issue

    Don't worry about the 125hp straining the boats transom, the max torque between it and an 85 is pretty close(the 125 only had 7 more cubic inches of displacement than a 1969 -78 85hp), it does occur at a higher RPM, so the 85 actually has better holeshot. You say you spun the hub? How did you...
  6. jimmbo

    What prop do I have?

    Jetting for higher altitudes
  7. jimmbo

    Prop for 1963 75hp Evinrude

    The gearcases on most of the Pre1969 V4s of less than 100hp were a bit of an oddity. The props were actually smaller in Diameter than those used by the 25, 28, 30, 33, 35, and 40hp engines of the day. These engines had very little gear reduction in the gear case, 23:20. There were only 5...
  8. jimmbo

    replacing springs on boat trailer

    This is how my spring(broken) was attached at the factory
  9. jimmbo

    Evinrude 40973R 40HP Selectric Shift - Forward Spring and Gear Hub - Slipped?

    Just out of curiosity, what is the measurement of your boats transom? Looking at the parts I would say it was run, at some point, with a lot of water in the oil, or just too low of an oil level. It might just be the light, but the teeth on the gear look pitted on one face and a bad contact...
  10. jimmbo

    Power loss in 1977 Johnson 6HP (1/2 power possibly)

    The vent and fuel valves in the tank are opened when this pin(white arrow) is pushed in by the hose connector. You probably need a new fitting, or new tank
  11. jimmbo

    75 Johnson Trim tilt

    This what a power trim unit for you engine looks like, and how it mounts/fits on the engine
  12. jimmbo

    I have an intake LEAK! looking for good replacement intake!

    Get a set of Vortec heads and the intake Volvo uses on the 305/350 engines. It is a four bbl manifold but Volvo uses it with 2bbl Holleys as well. Very good manifold.
  13. jimmbo

    Starting from scratch Oh boy

    well the 70 hp 49.7 3 cylinder looper had this ratio for many years
  14. jimmbo

    Bearing issues...

    Both spindles do indeed have the remains of the inner bearing on them(blue arrow). The damaged area will weaken the spindle considerably(red arrow)
  15. jimmbo

    plug wiring on 79 mercury 115hp

    You have six coils stacked vertically and six cylinders stacked vertically. top coil should go to the top cylinder, the next coil down goes to second from top, 3rd goes to 3rd 4 goes to four, etc etc. At least that's the way it came from the factory. however if someone rewired the switchbox...
  16. jimmbo

    Well the never ending saga of my plow truck is coming to an end!

    Call Mr. Plow, that's my name, that name again is Mr. Plow
  17. jimmbo

    57 evinrude 35hp surging.

    An engine that sounds like it is routinely hitting things at high speed is often experiencing a worn clutch dog/gears, but since you are having other issues it might not be that. Sneezing is usually a sign of a lean condition, usually occurs at or just above idle. Do you still have good spark to...
  18. jimmbo

    Evinrude 40973R 40HP Selectric Shift - Slipping or Spun Prop Diagnostics

    I'll have to lighten the shadows in PS to get a fair look at the transom height, but I can see the engine looks like it needs to be one tilt, maybe two pin hole further out. Edit Your engine height, assuming the boat bottom is pretty much flat across the transom looks close, maybe an inch deep...
  19. jimmbo

    Anyone ever time a 1988 merc 115 6 cylinder? Need cranking timing BTDC or ATDC

    Brown stripe cowls were 1984 and 1985. I would say you have a 1985 engine, cowl and serial # 1984 115 1984 115 with 1971 cowl
  20. jimmbo

    Anyone ever time a 1988 merc 115 6 cylinder? Need cranking timing BTDC or ATDC

    The idle speed adjustment is located throttle linkage arm on the port side on the engine(circled area)
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