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  1. jimmbo

    Power head swap from 4cylinder to 3 cylinder

    Welcome to iboats. No Crankshaft/Driveshaft Splines are different, and even if they were the same, the Gear Ratios are no where close to each other
  2. jimmbo

    How do you guys mix Gas

    Oil is still heavier/denser than Gasoline, and the Laws of Physics still apply...
  3. jimmbo

    Motor needs help.

    It is amazing how these things can run with a Broken Crank. Even if you replace the Crank, the rest of the Rotating Assembly, Pistons and Rings will need a thorough Inspection. Cheaper to replace it with another used/abused engine
  4. jimmbo

    How do you guys mix Gas

    Pouring the oil into a tank of gas, with no mixing, was one of the main Reasons that the Engine Manufacturers, developed the Oil Premixing Systems back in the mid 80s. They were tired of boaters wrecking engines, then blaming the Engine, instead of themselves
  5. jimmbo

    Evinrude 40 HP WorkTwin Question

    Do the Rings have any tension?
  6. jimmbo

    How do you guys mix Gas

    Since you are transporting the Fuel in Jerry Cans, You have a chance to mix it properly. Add a gallon or 2 gas to the Can, add the correct amount of oil for a full can, Put the Cap on the Can, shake it vigorously a few times, fill it to 3/4s full, and shake it again, sloshing the gas-oil around...
  7. jimmbo

    Evinrude 40 HP WorkTwin Question

    Sending you a PM
  8. jimmbo

    1985 Evinrude 140 V4 running very rough/ hard to start

    Any time the Carbs are R&Red, the linkages between each other, and with the Spark Advance Plate, need to be verified and adjusted if need be. You need to get a Factory Service Manual specific to you model and year of Engine. How did you manage to take the carbs apart, without taking the Fuel...
  9. jimmbo

    20 to 25 hp

    You must mean the Dreamers who think a 'Force by Mercury' is a Merc. Those are forever appearing in the Merc Forums
  10. jimmbo

    20 to 25 hp

    To make the extra 5 hp from the same Displacement, OMC had to spin the engine several hundred Rpms faster. To do that, they had to change the Port Timing. To do that without moving the Ports in the Block, they relocated the Wrist Pin in the piston in relation to the Crown of the Piston, which...
  11. jimmbo

    1985 Evinrude 140 V4 running very rough/ hard to start

    Welcome to iboats First things first, what are the Compression #s You say it has spark on all cylinders. Is the spark strong enough to jump a gap of 3/8"? You said you cleaned the carbs. Did that include removing them, taking them apart, checking/adjusting the Floats, removing all the plug...
  12. jimmbo

    20 to 25 hp

    To turn that 20 into a 25 requires different Pistons, Cylinder Head, Intake Manifold, Reed Assembly, Carb, and even the Crankshaft(the 25hp version, is more precise in Balance)
  13. jimmbo

    Not running at full throttle

    When you put the carbs back on, did you make sure both are closed at Idle, and both open fully, and they are properly synced with the Spark Advance?
  14. jimmbo

    2 stroke vs 4 stroke prop differences

    Gear Ratio is only part of it, WOT Rpm range is also a factor, as is Torque, when it comes to what differences in Props
  15. jimmbo

    1995 175hp VRO conversion won't start without starting fluid :(

    Refrain from using Starting Fluid on a 2 Stroke. It can be a Death Sentence for it.
  16. jimmbo

    Difference between 1997 & 1998 90hp 2 stroke outboard

    Welcome to iboats The serial number should also be on a Disc(kind of looks like a frostplug) on the block. The difference might be a completely different Powerhead, but it could instead be a different midsection, or transom bracket. Without Serial numbers, I can't even pick the proper parts...
  17. jimmbo

    55 or 56

    24:1 would be the recommended ratio. 16:1 is for better Mosquito Control
  18. jimmbo

    Porpoising Assistance

    Rebalancing the Load or adding a bit of Ballast , is preferable to trimming the engine In excessively
  19. jimmbo

    Evenrude 70 won't speed up lack of power.

    Is the timing advancing as Throttle is applied?
  20. jimmbo

    Uprgrading outboard

    Is the 35 much different in Physical Size? If not, I would just redecal it
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