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  1. jimmbo

    In dash GPS speedo?

    Simple math and the actual speed can be determined with Ground Radar
  2. jimmbo

    1st time boat owner.

    Welcome to iboats http://www.fiberglassics.com/library/index.php?title=Aerocraft
  3. jimmbo

    2020 Glastron GT185 only 43 MPH top speed

    MC 4.5L 200/A 14 1/2 x 19 AL 48-51mph 77-82kmph Page 13 If Glastron is giving a range of 48 - 51 mph, with a 19 inch prop. I will assume the 48mph is at 4400 rpm and the 51 is at 4800 rpm. So something is not adding up. What is the gear Ratio on your outdrive?
  4. jimmbo

    In dash GPS speedo?

    I was just pointing out that GPS is not the Godsend when it comes to speedometers. On land, Going up/down inclines will provide inaccurate readings, usually in numbers lower than the actual speed, so GPS will be less accurate than the Cop's Doppler Radar, used to give you a Ticket
  5. jimmbo

    1974 Evinrude 50hp outboard

    All the Electrical in good Condition, Cables, Connections? Something is changing from when it is on the trailer, to when it is in the water, and vice versa
  6. jimmbo

    Ventelation cures

    A 16 footer is naturally going to be far more sensitive to Trim than a 22ft barge. At the speeds a 16 ft can attain with a 40hp, you won't be able to do much trimming out without Porpoising, and/or the Prop grabbing Air A cupped prop may help, but usually at higher speeds. Do you know what...
  7. jimmbo

    1974 Evinrude 50hp outboard

    So it won't crank, in the water? hmm
  8. jimmbo

    Can I bypass the solenoid yellow wire in 79 Evinrude outboard?

    Primer Pump? The only Primer Pump that Engine has is in the Fuel Line, and it is usually silent.
  9. jimmbo

    2020 Glastron GT185 only 43 MPH top speed

    Welcome to iboats I would expect about 45- 46 out of that combo, so you're not too far off. I doubt the Rev Limiter is set at the top of the recommended WOT Range which is 4400 - 4800. They usually don't kick in until a few hundred rpm above it. Are you trimming the outdrive out for best speed...
  10. jimmbo

    In dash GPS speedo?

    Plastic Bags have ruined many engines.
  11. jimmbo

    4.3 Carb v 4.3MPI

    Vapour Lock occurs in the Fuel Line, upstream of a Fuel Pump. Things like Percolation, which can sometimes give Symptoms that are similar, but are caused by heated fuel overloading a Carb when the Inlet Valve opens after a Hot Soak.
  12. jimmbo

    Modern Engine Thoughts

    As I really don't like 4 Strokes, I would rebuild the 2 Stroke Evinrude. Lighter, Faster Acceleration, and better Mosquito Control, and a lot fewer parts to break
  13. jimmbo

    In dash GPS speedo?

    Be Aware that the GPS will be giving you a Ground Speed, not a Water Speed. If there is a Current, you will find the boat going faster in one direction, and slower in the opposite.
  14. jimmbo

    Merc "classic" 50hp ID

    Brown Decals were only used in 1984 and 85
  15. jimmbo

    ‘83 Glastron Sx-190 looking for other owners

    Welcome to iboats Looks great!
  16. jimmbo

    1995 mercury 50elpt4s runs rough

    Glad to see you found a Snake Oil that worked. It is usually 2 strokes that get Rings that are stuck because of Carbon buildup.
  17. jimmbo

    1968 Johnson Tr-10r 55hp wiring help

    No. It is a 3rd Party manual that was far ahead of the Clymer and Seloc manuals. I can't remember who published it, as the first several pages are missing, and so is the Spine. It covers most makes between 1955 and 1971. It was the 1972 Edition, my dad bought it in 72
  18. jimmbo

    Pairing engine size with boat size

    I find that if you put a 2 stroke and 4 stroke side by side, and both hit the gas, the 2 stroke will be across the lake and back before the 4 stroke is on plane
  19. jimmbo

    Pairing engine size with boat size

    Keeps the Shareholders Happy
  20. jimmbo

    Pairing engine size with boat size

    The 4 Strokes are certainly Porkers, and are a lot slower with the Holeshot. I can see why there are a lot of People asking if they can Ski with 115s and even larger engines, when with 2 strokes, a 40, even less would have pulled them up
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