I know, I know.. another engines running rough thread!

[Van Wildonher]

Just got to fire my boat up won't idle for crap. Things I have done are:

Emptied fuel tank.
Rebuilt all carbs.
Replaced fuel lines.
Replaced fuel filters.
Changed spark plugs.
Replaced clamps on all hoses.


While they are at idle the starboard engine keeps making a sound like "dunk" "dunk" "dunk" and stalls or starts running backwards. I think they are misfires but I'm not certain what they are called.

The port engine runs way better with the occasional "dunk" but shift into gear and it dies. It is idling at around 1100 rpm in neutral.

I'm looking for the next step here. I know a lot of people have problems like these, hopefully somebody can chime in and help me clear mine up. The engines are 200's '88s or so.

 

[Van Wildonher]

Re: I know, I know.. another engines running rough thread!

Well I feel like a moron. Went out today and 1st and 2nd plugs on the starboard side of both motors were switched around. I have a feeling that the starboard motor is getting too much oil though...

 

[oldcatamount]

Re: I know, I know.. another engines running rough thread!

What makes you think your starboard motor is getting to much oil? Fouled plugs? Drooling from exhaust? Smoke?

 

[Van Wildonher]

Re: I know, I know.. another engines running rough thread!

Hard starts and smoke, and some oil bubbles earlier today. I am running premixed gas right now too though. Next time I run it I will mark the tanks and compare.

 

[boobie]

Re: I know, I know.. another engines running rough thread!

Running rough ?? 1st and 2nd plugs swapped around on strb side ?????

 

[Van Wildonher]

Re: I know, I know.. another engines running rough thread!

Running rough ?? 1st and 2nd plugs swapped around on strb side ?????

Ya lost me... are you suggesting this after I already stated that's what the problem was? Or confirming that was the problem or something else?

 

[jonesg]

Re: I know, I know.. another engines running rough thread!

You'd get more help if you were more specific, I can't make heads nor tails of your descriptions.

"Running rough ?? 1st and 2nd plugs swapped around on strb side ????? "

Ditto.

 

[Van Wildonher]

Re: I know, I know.. another engines running rough thread!

Sorry I meant the plug wires. I guess they might be cylinder one and three.
It is running much better now after putting them on the right way.