What would make an outboard boat motor load up or boog down and not gain rpm. just changed the plugs not it.?

Question

What would make an outboard boat motor load up or boog down and not gain rpm. just changed the plugs not it.?

Answer 1

definately sounds like a fuel problem. Gunked up carbs or carbs way out of adjustment are the most likely causes.

Answer 2

You have got all the answers that I would give.

Fuel system blocked or dirty. Start with filters

Plugs are too cold.

Good luck.

Answer 3

dirty carbs. disassemble, clean, adjust and you should be good to go. I assume you have good spark on all cylinders?

Answer 4

Could be spark plugs in the wrong heat range.  If they're too cold they'll oil up, but it's probably fuel supply.

Answer 5

Bad air filter, bad fuel filter, choke not opening, no gear oil in the leg, dirty carburetor, bad fuel pump.

Answer 6

Do the easiest or simplest first. Make sure the vent is open on the fuel tank for proper flow.

  Good luck

Answer 7

Clean or rebuild your carbs.

Answer 8

Sound like incorrect carb settings or blocked fuel passages. Clean carbs and re-set. Hope this helps