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  1. jimmbo

    Spark plug crossover question

    A Yamaha Dealer, actually most Boat Dealers, would likely have the NGKs, as well as Amazon
  2. jimmbo

    1976 Mercury 500 only runs for a few seconds

    Is the Primer Bulb installed in the correct direction? If it is and it is not moving Fuel, one or more of the Check Valves in it are stuck open Have you tried spraying a bit of Premix into the Carbs?
  3. jimmbo

    1976 Mercury 500 only runs for a few seconds

    So are you also bypassing the Fuel Pump? Or does this motor have 2 Fuel Pumps, one for each Carb?
  4. jimmbo

    18 horsepower 1969 evinrude

    No, tanks are usually a few feet lower than the Carb.
  5. jimmbo

    97 40hp Merc serial number isn't matching up with it's parts?

    deleted as link didn't work as promised
  6. jimmbo

    18 horsepower 1969 evinrude

    If no fuel is getting to the Carb, plugged Lines, plugged pickup in the tank, Fuel Pump defective, or Hoses reversed. Air Leaks in Fuel Line. Inlet Valve not opening, due to Improper Float Adjustment, or Installation Does the Primer Bulb firm up?
  7. jimmbo

    Holley 2300 2 BBL fuel filter

    Not on the OEM Marine Carbs, or on some of the Aftermarket ones https://www.holley.com/products/marine_and_powersports/marine/marine_carburetors/parts/0-80402-2 https://www.holley.com/products/marine_and_powersports/marine/marine_carburetors/parts/0-80402-1 others have provisions for one...
  8. jimmbo

    Everything done but low rpm at WOT. Distributor spring?

    454 engine spinning 5000 rpm can only inhale 660 cfm of air at 100% VE. At 78% VE the number is 515 cfm. Any Mercrusier Engine designated for Racing would certainly need a bigger Carb, and if the Class Rules stated the Engine had to use a carb that came from the Factory, then yes they would have...
  9. jimmbo

    Everything done but low rpm at WOT. Distributor spring?

    Only if the 454 is spinning over 6000rpm. Otherwise it is plenty
  10. jimmbo

    Everything done but low rpm at WOT. Distributor spring?

    The 1850 is not a Marine Carb, and is not Legal
  11. jimmbo

    Can you rebend a broken recoil spring?

    For some reason the Title caused a Bee Gees song to start playing in my Head
  12. jimmbo

    Help! Won’t start when hot.

    Actually a very poor Design, as it provides Conflicting Info, when an Overheat Alarm is sounding, The Tell Tale should be located further down the Cooling System, like maybe above the Top Cylinder(s)
  13. jimmbo

    Help! Won’t start when hot.

    If the engine died because it was hot, it likely occurred because the Piston and Cylinder ran out of Clearance. Lack of Clearance is what causes Scuffing/Scoring of the Pistons and Cylinder Walls
  14. jimmbo

    18 horsepower 1969 evinrude

    Compression, Spark, and Fuel are all needed at the proper time, and the correct quantity for the engine to run. Does it have a Spark that can jump a 5/16" gap? Is Fuel getting to the Carb? Is the Float set correctly? Have you done a Compression Test? If yes, what are Numbers. If No, why Not?
  15. jimmbo

    Chrysler 55 one cylinder occasionally fires

    One time I was trying to put my Winter Tires on, and one of the Wheel Nuts just wouldn't loosen. I then went back to my Cousins shop which had that Wheel off a month earlier, they Eventually got it off, but it took over 240 Foot Pounds to break it loose. I certainly had Words with my cousin...
  16. jimmbo

    Everything done but low rpm at WOT. Distributor spring?

    Compression, Fuel and Spark are needed. What are the Compression Numbers? Spark Issues and Timing Advance? New Distributor, should not be a Problem.... Is a Spark good enough to jump a 7/16" Gap getting to every Cylinder? Fuel: That is a Holley 4bbl on there? Are the Primaries opening fully...
  17. jimmbo

    Just thought I'd share a nice photo.

    You should still be able to edit the Extra Image out
  18. jimmbo

    30 etec - 16 ft aluminum

    2, 3, 4, even 5 Props with the same Dia and Pitch can, and often deliver as many different Results as there are Props. Reasonably accurate Predictions of results are only possible when the Brand and Model of a Replacement Prop is the Same as the one being replaced. Change the Brand or the Model...
  19. jimmbo

    Clutch Fan to Electric Conversion, 1997 Suburban

    Is the AC Compressor Short Cycling? Maybe there is a bunch of stuff that made it thru the Condenser, and has taken Residence on the Front of the Radiator? That can certainly Impede Airflow at Idle and Low Speeds.
  20. jimmbo

    Stainless Prop Film

    Is the Gimbal Housing/Outdrive housing Grounded?
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