One carb is running rich


Information and questions on GL1200 Goldwings (1984-1987)
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rrod1393
Posts: 56
Joined: Wed Aug 22, 2018 3:56 pm
Location: Freehold, NJ
Motorcycle: 1985 GL1200 Interstate
2000 Kawasaki Vulcan 1500 Classic

One carb is running rich

Post by rrod1393 »



So I have pulled off my carbs on my 85 GL1200 and did a full rebuild just about a month ago. Set the float height which was way off. When the bike idles I can smell the exhaust and tell its running rich. I hook up the Colortune to it and cylinders 1,2,3 all have a nice blue combustion. Then, of course the last cylinder 4 is running bright orange. I start turning in the pilot screw and I see a very small change in the mixture until the engine starts missing. Turn it back out, and then it bluish with some orange. Rev it a couple time and the orange is still there on idle. I turned it down a tad more till I saw more blue (it was hard to get a blue combustion). I resynced the carbs and left it alone. Still has a slight rich smell to it. Any idea what could be the issue? New rebuild kit. Pilot screws were set to 2.25 turns out when I installed the carbs back on the bike. Everything was soaked and cleaned. I don't believe the enrichener valve was open cause I did not think the check as there wasn't a problem on other cylinders. Just asking other brains what they think.



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virgilmobile
Posts: 9087
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: One carb is running rich

Post by virgilmobile »

Oh those enrichner valves..Do look close at them.I did have 2 on mine that didn't quite seal up.The control arm (fork) assembly is spring loaded and mine were sticking part way.
The mechanism that operates the "forks" is also spring loaded.When I looked,2 of the forks were resting on the closed position and 2 had the valves just a bit open.

User avatar
rrod1393
Posts: 56
Joined: Wed Aug 22, 2018 3:56 pm
Location: Freehold, NJ
Motorcycle: 1985 GL1200 Interstate
2000 Kawasaki Vulcan 1500 Classic

Re: One carb is running rich

Post by rrod1393 »

So they forks were holding the valve open or the valve just wasn't seating? I took a quick peak (hard to see with the carb cover on) and it looks like there is play between the fork and valve when in the closed position. What did you do to fix it.

User avatar
virgilmobile
Posts: 9087
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: One carb is running rich

Post by virgilmobile »

Before you tear it apart to "fix" that..verify it it the problem.Start the bike with the color tune plug..With a long screwdriver,gently pry/push the plunger in and see if it does or does not make the desired change.



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