rpm stays high

[4962]

Hi
I'm having trouble with my 1977 wing
It stays in a high idle around 3 to 4 thousand and will not come down
I tried to adjust idle screw it go down to about 900 but when I start to ride it goes back up I get it to come down by leaving it in gear when I go to stop I checked all cables and they seem fine I had my carbs synchroniz I cleaned the carb’s but still do’s the same thing???

[86pearlblue]

Have you checked to make sure the choke comes fully off? Or perhaps check that the air filter and inlet tubes are not restricted. Slight restrictions could cause a "half choke" situation where the idle will come up. Make sure there are no mice or other rodents building nests,etc. in the air pathway.

[4962]

My choke is not even conn. right now
air filter new also it back fires while running hat higher rpm and when drivein it back fores while in lower rpm between 2000 and 3000
??

[portugeezer]

Is the throttle snapping back? The throttle will stick if one of the cables is going or if there is not enough tension on the spring on the back of the carbs.

[4962]

yes the throttle is snapping back

[Fred Camper]

Sounds like the slides are sticking, maybe try seafoam first and see if you can get improvement. It always takes several tanks of fuel to get a bike back after sitting. Bent carb linkage has been shown to cause that as well. But I would try seafoam and three tanks of fuel first.

[portugeezer]

Shine a flaslight on the linkage and twist the throttle to make sure everything is working. Manually make sure the choke is off. If all of that checks out clean up those sliders like Fred suggested. I'm still learning about my bike. Once you've had yours for awhile you will get it running top notch and will know where to look when something isn't right! Don't give up!

[86pearlblue]

Shine a flaslight on the linkage and twist the throttle to make sure everything is working. Manually make sure the choke is off. If all of that checks out clean up those sliders like Fred suggested. I'm still learning about my bike. Once you've had yours for awhile you will get it running top notch and will know where to look when something isn't right! Don't give up!

The choke flapper valve acts like a wing in the manifold. the air flow through it will try to close it until it reaches an equilibrium of the high air pressure outside, trying to close it, and the vacuum inside pulling it open. If the choke is not hooked up to the cable, there no way to ensure the choke IS fully open. So do try to reach in and manually pull it off.

[Fred Camper]

I did not know the choke could flop around without a cable, thank you for letting us know.

[86pearlblue]

I did not know the choke could flop around without a cable, thank you for letting us know.

I don't know about "flopping", but yes, it can move! There's really nothing to prevent it. On older model cars, there was a bi-metal actuator. Most "newer" carburetors have a spring loaded gate built into the flapper, but it still creates a partial choke condition. Without the cable attached, there's just no way to know exactly what the position of the choke is. With air flow and vibration, it very well could start to close as there is nothing to prevent it from doing so (springs, etc.). Think about your lawn mower. The choke is spring loaded closed, but designed to open with air flow. There is no such mechanism on the goldwing, just a cable. This is why most cars and newer machines have switched to fuel injection. Does away with the whole choke thing by simply enriching the fuel mixture when cold.

[Placerville]

Another possibility is that you have a vacuum leak. To check for the presence of a leak, do the following: Bring your bike to operating temperature. Using an unlit propane torch with the valve slightly opened, move the tip of the torch around to areas that could leak. Start with your tubes and move in toward the center. If the rpm's suddenly jump (from the introduction of propane into the carbs) you've found a leak.

[sfruechte]

Keep us posted on what you find. My 77 will act in a similar way but only in very hot weather. Marvel Mystery Oil in the gas seems to help. I also use SeaFoam. If I come to a stop at low rpm, the rpm will stay low but if I slip it into neutral before stopping the engine speed will pickup on very hot days. My rpm is also a little slower than your usually between 2 and 3K rpm.

[Old Fogey]

I did not know the choke could flop around without a cable, thank you for letting us know.

They can't! Both side of the carb bank have sprung loaded spindles which keep the butterflies open. The springs are hidden under the black plastic caps on the #3 and #4 carb.