Cleaned Carbs - Same Problem

[grandman]

After making sure I had spark at the plug and good compression in the cylinder, I pulled apart the carbs on my 1983 GS1100E to see if they were the reason I was running on 3 cylinders at idle. Here's what I found:



Not bad, right? Nothing gunked up, no o-rings damaged, and only one semi-clogged hole in one of the main jets (not the one giving me problems). I carefully inspected as I went and let everything soak overnight before blowing it out and re-installing the next day. Started it up and exactly the same problem: Runs on 3 cylinders at idle, then springs to life with a little throttle.

Airbox is tight and all boots are nice and soft and tight.

Any ideas?

Here's my pic since I know you all like pictures and the thread link in my signature seems to have been deleted.

[tom203]

Which carb is not working at idle /low speed- isn't it likely that the low speed passages are blocked, since it "springs to life" once you introduce the main jet to the party.

[tkent02]

Which carb is not working at idle /low speed- isn't it likely that the low speed passages are blocked, since it "springs to life" once you introduce the main jet to the party.

No, when you bring the needle jet to the party. A problem with idle only is your pilot jet or it's circuit.

You have it that far apart, dip them and do the whole job correctly.

[grandman]

I 'had' them that far apart. Everything's put together again. It's cylinder #4.

[tkent02]

Any chance it happens only when the choke is in use?

[grandman]

Any chance it happens only when the choke is in use?

Nope - it's pretty constant - even when hot. Has a nice stumble just off idle until it kicks in.

[tkent02]

OK, it's not the choke circuit at fault... try this, put some Techron in the gas and ride it a while, it could clean out and start to run right.
Slight chance, anyway.

[grandman]

Happy to try anything. Thanks for the suggestion. Next step is taking them apart again and doing the dip (even though they were pretty pristine).

OK, it's not the choke circuit at fault... try this, put some Techron in the gas and ride it a while, it could clean out and start to run right.
Slight chance, anyway.

[hampshirehog]

It's either a blocked pilot jet (or part of that circuit) or your mixture screw is way out of whack.

[tkent02]

It could also be the carbs are WAY out of synch.

[Nessism]

Carb rebuild tutorial is linked in my signature. It's worth a read though to make sure you didn't miss anything...

[Steve]

It could also be the carbs are WAY out of synch.

That is where I would put my money, and they don't really have to be all that far out of sync.

In fact, that is the whole purpose of a "sync", it is to synchronize the opening of all the throttle blades.


.

[hampshirehog]

It could also be the carbs are WAY out of synch.

Yes - that too.

[AJ]

It's either a blocked pilot jet (or part of that circuit) or your mixture screw is way out of whack.

My vote is for a blocked low-speed jet. Tiny little buggers.

[tkent02]

Easier to check the synch than pull everything apart again.....