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  1. jimmbo

    Transom adaptor from 15" to 20"?

    The 35 was rated at the Crank, the 40 is rated at the prop, and used to be a 50 horsepower at the Crank. The 35 has a displacement of about 38 cu in., while the 40 is 44 cu in. The 40 will be a much smoother engine, especially at low speeds, and is very easy to rope start as it has 4 smaller...
  2. jimmbo

    Identifying old SS OMC prop size

    Here is a page from the OMC Accessory Catalog
  3. jimmbo

    Pics of your Fiberform boat

    Anyone know the Model Name of this Fiberform hull?
  4. jimmbo

    1973 Evinrude 50373r lubrication questions

    The Manuals from that Era, would say OMC Type C, now known as Premium Blend, simply because that was the only Gear Oil OMC marketed. A couple of yrs later, they came out with HiVis for use in anything but the Electrics and Hydro Electrics. Prior to the Electric Shifts and Type C, the Oil...
  5. jimmbo

    Has anyone seen or heard of a trailer tire doing this?

    Better to have it delaminate there than on the Trailer going 110km/hr, like mine did
  6. jimmbo

    Gear case hole?

    Is it gear oil? The stuff stinks to High Heaven, while 2 stoke Oil doesn't smell too bad.
  7. jimmbo

    Does this gear and clutch dog look ok?

    Only if you want to be taking it apart again soon. I suspect your Father in Law was one of those who 'Eased' it into gear. That, and shifting at too high of a RPM, is what causes the most damage. I know my Dad and My Uncle had some Big Twins from the Late 50s where they would swap the Forward...
  8. jimmbo

    Trailer Tires

    In 2017 I had a blowout on the highway, the Tire was a Goodyear Marathon, but it was 12 yrs old. I replaced the tire with the newer Goodyear Endurance and really like them
  9. jimmbo

    Old Johnson 115hp: How do I know if it is a 2-stroke or 4-stroke?

    The Oil Premixing System(VRO) was introduced in 1984, any OMC outboard prior to that will need to have oil added to the gas. In the case of a 115, 50:1 using a TCW-3 Oil.
  10. jimmbo

    Glastron is no longer

    I was at my Dealer on April 9, and was told that Glastron has shut down
  11. jimmbo

    Somber news for iboats forums members.

    RIP Don, you are already missed
  12. jimmbo

    Old merc outboard details?

    The transom bracket, on your engine is Post 1983, used by both Mercury and Mariner, and uses a Power Trim System that is completely contained within the Bracket, using 2 Short Trim Rams, and 1 Tilt Ram. Looking the Pic, someone retracted Trim rams all the way in. That is done on OMC Outboards...
  13. jimmbo

    Old merc outboard details?

    How long have you had this motor? Do you know if the gearcase was ever replaced? If the compression is good, and so is the ignition.... Check the gear ratio. Your engine should have a 2.3:1 ratio. A gear case from an inline six, will bolt up, and has a 2:1 gear ratio, which would make it hard...
  14. jimmbo

    How to Synchronize Old school V4.

  15. jimmbo

    1962 Johnson RK-24-L 40hp Throttle Control Issues

    Being you gave a Model # RK24, I am assuming it is an Electric Shift, with SIngle Lever control looking like this [B] Gear Oil must be an Electric Shift Compatible Type "C" oil, BRP sells it as Precision Blend. Other brands are out there, but some are not Compatible with the Electric Shift
  16. jimmbo

    Transom "thumb screw" thread spec

    Here the Motor is being held about 1 1/4" or so higher than the transom, just clamped on by the 4 bolts
  17. jimmbo

    1960 Evinrude Lark 40HP Model 35520

    Those compression numbers are fine. 43.9 cubic inch displacement 40 hp @4500 rpm 4000 - 5000 WOT range 21:12 gear ratio Automatic Choke Recirculating Thermostatically controlled Cooling System Adjustable Hi and Low speed Mixture
  18. jimmbo

    Is a roller trailer okay?

    I prefer not to get my feet wet, or submerging the Car, when launching and loading,
  19. jimmbo

    Is a roller trailer okay?

    With lots of Rollers, even a Heavy Boat can be supported properly
  20. jimmbo

    Unsafe Torque Steer Help Please

    I'll be surprised if you don't have water starvation problems At those engine Heights, a Torque Tab, as mentioned by Chris, is usually needed/added You really need to get a Prop that is Designed to run partially Submerged
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