GL1200 Stalls when engaging choke

[marcusknight]

On my 1984 GL1200, I was about to take it out for the third ride this year. Its been about two weeks since last time and at that point I had no problem.

Today I start to take it out and when I get to the end of the driveway I notice that it is not itself. The RPMs were weaker and the choke was still on.

I rode it around the driveway a few times but nothing changed. So I put it back in the garage and started experimenting.

I can start it fine with the choke off but I often have to give it throttle to do so.

As soon as I engage the choke, it stalls.

I did use stabil in the gas about six months ago, but it has been running a few times since and I filled it up at least once in the last few months. Nothing else has been in the gas. Spark Plugs changed a year ago. Oil changed a couple hundred miles ago.

Here is a video I took with my cell phone.

https://youtu.be/7gdXyzgUPw8

[video]https://youtu.be/7gdXyzgUPw8[/video]

Thoughts?

 

[marcusknight]

In the video I have some concern about the fuel pump. Note that I usually have to run the bike for a good 4-5 minutes with choke on so it does not stall. This time it is stalling when I try to start it with the choke. Weird.

 

[joedrum]

hmmmm sounds like it might be still a mystery to me ...so now it starting up without choke and dies when choke is applied hmmmm...id try and get it warmed up and ride it to see what else it might be doing different ...just stay close to home

 

[marcusknight]

My immediate thoughts are the fuel pump. But we shall see.

 

[dan filipi]

When putting choke on, idle is suppose to speed up some. It's not doing that. I don't know how the linkage is suppose to move the throttle to do that but it looks like it isn't and if idle would speed up it wouldn't die.

I'd check the fuel pump with a hose run from the discharge side to a low pressure gauge. Should read 2-3 lbs pressure.

 

[slabghost]

How warm was it when this happened? On my 84 I only use the choke below 50 degrees. It starts easier without the choke and warms enough to idle in just a couple minutes. The linkage to the choke (enricheners) tends to get stuck at least on mine so I've lubed the linkage several times but otherwise tend to ignore it.

 

[Denver]

When mine are warm, they will not stay running with the choke left on, stalls when you stop for any reason & won't idle, take choke off runs fine. :roll: Fuel pump looks like a Mitsubishi from an 84 Prelude, have them on all three of my 1200's, & couldn't be more pleased. :yes: Doubt that fuel pump is your issue, :nea: as they are very reliable! :good:

 

[marcusknight]

Has anyone else done this kind of job instead of replacing the fuel pump? Does it work?

https://www.youtube.com/watch?v=pcEeGhvPxq4

 

[Ansimp]

marcusknight » Mon Mar 14, 2016 2:14 pm[/url]":2a2pobj1]
Has anyone else done this kind of job instead of replacing the fuel pump? Does it work?

https://www.youtube.com/watch?v=pcEeGhvPxq4

I have done it on early CBR1000f pumps and other automotive point style facet pumps :yes:
The other common problem is with the non return valves.

 

[marcusknight]

One of my buddies encourages me to see how it handles on the road because you are using different carb jets at idle versus when on the road.

 

[dan filipi]

marcusknight » Yesterday, 8:14 pm[/url]":28w1lex7]
Has anyone else done this kind of job instead of replacing the fuel pump? Does it work?

https://www.youtube.com/watch?v=pcEeGhvPxq4

I did similar on the 1200 pump I have. Pulled a piece of fine sand paper across both sides of the points. A couple passes is all it took to clean them.

 

[deanmay]

Found a almost direct replacement fuel pump on eBay for less than $30. Look for 2005 Suzuki QUV620 QUV 620 and supplier is High Fuel Flow. Also found one for $21 For '01-'08 Kawasaki Mule that looks identical. It uses the original mount bracket. I was able to reuse chrome end cap with a little finagling. Outlets are too big but comes with reducers

 

[Tom_Charlton]

GL1200s don't have actual "chokes". The choke circuit is a "bystarter" system in which the choke lever opens a valve rather than closing a butterfly in the venturi area as in many carburetors. In the open position, the slow jet discharges a stream of fuel into the carburetor venturi to enrich the mixture when the engine is cold.

Check the choke cable end at the front of the carburetors. If it has slipped out of the starter valve arm, the engine will stumble when cold. The correct amount of movement for the starter valve from open to closed is 1/4 inch.
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