1996 johnson 200 running Rough.

[Chuck4741444]

Motor new to me, it running rough, I have rebuild carbs, clean the holes in the throttle plate, stars and runs easy. I have sprayed carb cleaner on the carbs, throttle plate and the intake manifold.
Crank case seal, check for loss fuel lines, I cant find an air leak, I pulled the plugs and they ate all wet, could this be a bad coils ? 1 or more?

 

[Chuck4741444]

I have a 1/8 vacuum line coming fron the crank case, I plugged it, I dont know where it should go. Could the electric primer be letting fuel through it? The did have the purple white wire disconnected, i added a plug and reconnected it, it doest can the rough running either connected or disconnected.

 

[jimmbo]

On the Video, it sounds okay, granted 3 of the 6 could be not firing and it would still sound not too bad. It is a Looper, and they are a bit more jumpy than a Crossfire
First things first, What are the Compression Numbers? Saying they are fine means nothing...
Can the Spark jump a 3/8" Gap at all Cylinders?
Where is this line/hose on the Crankcase coming from, and what is its Size?
Did you set the Floats correctly?
Once you reinstalled the Carbs, did you do what is called a Link and Sync?

 

[Chuck4741444]

The hoes is an1/8 from the front lower of the crankcase.
The floats were set, the carburetor comes off without disturbing the linkage , its all connected on the throttle plate.the throttle,
Ill check the spark gap,
And make sure coils are firing, the one thing I may have done is i used the nylon washer under the needle set,

 

[jimmbo]

That Hose, is likely part of the Oil Recirculation System, and needs to be connected to where it is supposed to go.
You will need a Spark Gap Tester to test if the Spark is Strong enough

 

[Crosbyman]

oil recirculation to prevent puddling is even built in modern ETEC engines and a concept going way back on oldies. You likely have more than one such "small hose" on your 200hp as shown on an 200hp ETEC ..
On small engine push and pull from crankcase pressure-vacum pulse migrate the oil to the top without small smallcheck valves . Seems on bigger engine check valves are used so check your parts layout post your engine mdl# !!

 

[dingbat]

I have a 1/8 vacuum line coming fron the crank case, I plugged it, I dont know where it should go. Could the electric primer be letting fuel through it? The did have the purple white wire disconnected, i added a plug and reconnected it, it doest can the rough running either connected or disconnected.

I have the Evinrude version of that motor.
Sounds good to me. They are thrifty and idle a bit rough

One of the hoses gets inserted into a small hole in the lower/back side of the air box. Guess it’s used to pull fuel vapors out of the box

 

[Chuck4741444]

That Hose, is likely part of the Oil Recirculation System, and needs to be connected to where it is supposed to go.
You will need a Spark Gap Tester to test if the Spark is Strong enough

This motor has the oil deleted, it running pre mixed fuel.

 

[Chris1956]

When Dingbat says oil recirculation system, he is not talking about the oil injection system. Modern 2 cycle engines recirculate any pooled fuel and oil to find a place to burn it. Older 2 cycle motors like my Fat-Fifty simply dumped it overboard.

On my '98 Johnny 150HPV6, there are two fuel lines running to the airbox. One on the very bottom port side and one on the top starboard side. The service manual shows where they are connected to the motor and parts of the fuel system. They vent the bearings and other items.