1985 150

[spankydoo]

Cant seem to get full power out of the engine and compression is fine and there is plenty of spark the bottom two spark plugs have no burn on them they are clean with a little oil on them. Runs fine with the hose on it but when in the water its only running on four cylinders. last week when in the intercoastal i noticed astronger sound in the engine and i gave it power and it ran perfect for about 3 minutes.

 

[Daviet]

Re: 1985 150

Could you have water intrusion into the bottom plugs washing them clean?

 

[boobie]

Re: 1985 150

You could have a bottom carb that needs work.

 

[emdsapmgr]

Re: 1985 150

Good comments. Two good things to check. Water intrustion in the exhaust chest tends to affect the operation of the lower cylinders first. Here's a third: could be an intermittent spark problem. Take an inductive timing light with you next time out boating. When the engine acts up, put the timing light lead on each of the 6 plugwires. The flashes from the gun will tell you a lot about the quality of spark.

 

[spankydoo]

Re: 1985 150

first time at this and it really cool forum well today i removed the bottom carb and removed the parts to the carb and it seemed to be dry with a whitish yellow powder around the float area and no shiny oil in the chamber but a little gas did come out of the largest fuel port but not much. i have the seloc book and plan to clean it up any good advice before i start i am so ready to get back to the blue water west palm beach fl one mile from the boat ramp i have a redone 1972 aquasport and we love to fish.

 

[ljrichey]

Re: 1985 150

call yourself LUCKY---no fuel-- no lubrication---this should tell all about stuck needles in seats--& clean carbs -- happened to me--good lesson learned --with a few bucks--glad you found your prob--i would go thru the other carbs too if it were mine--

 

[emdsapmgr]

Re: 1985 150

The whitish powder is residue from dried ethanol fuel. You'll want to clean all the carb passages with a gas cleaner-like a Gumout type product. Pull all the jets out and visually inspect them for debris. Agree, do all 3 carbs.