Update: More fun with dual carburetor cables

Mailman · Oct 23, 2019

I don’t want to keep stepping on Gary’s XS1 thread, so I moved this here, I was commenting on the trouble I was having keeping my dual carburetor cables synchronized.

Mailman said:
Gary , something I have noticed with my carburetors, is that I’m having some difficulty in keeping the throttle action synchronized. Being non linked the two throttle cables have to be adjusted for length independently of each other to assure that the butterflies are turning at exactly the same time.
With my bike, I’ll get them just perfect, ride my bike several times and I notice the engine will start this shaking when you first twist the throttle. ( due to only one carburetor starting to open ) It took me a while to figure out, that my synchronization gets out of whack for some reason and I have to re adjust the cable length/ free play.
I wonder if you or anyone else with the early carbs run into this.

After posting this I got several useful comments and suggestions. But later I had an AHA! Moment.
I had replaced my right hand switch gear with a reproduction unit because the metal housing was broken on my original.

I was looking at the cable arrangement , where the cables enter the switch gear. Notice anything wrong?

When I installed the switch gear, I failed to transfer the little retaining plate that holds the cables up snug.
So I went through my original parts and found it.

And Viola! Now they’re held in nice and snug! Before they were moving in and out of the housing, not much, but enough to make things difficult. See! Never throw anything away! :laugh2:

Downeaster · Oct 23, 2019

Whenever I'm refurbishing something, I have four sections of storage:

1. New stuff that's going on.
2. Left over new stuff from "universal" kits.
3. Stuff I took off that I'm going to clean up and put back on.
4. Stuff I've already replaced, but ain't gonna throw away until the entire project is done and tested.

Even then, I've had the occasional "Dammit, I knew I shoulda kept that" experience.

TwoManyXS1Bs · Oct 23, 2019

Good save, Bob.

I found the cable clips are still available, Yamaha 90468-15009-00.

And, it seems that they're gold plated...

GLJ · Oct 23, 2019

Downeaster said:
Even then, I've had the occasional "Dammit, I knew I shoulda kept that" experience.

I solved that by never throwing old parts away. Who knows when you may need brake shoes without linings or a roached out master cylinder.

Problem is remembering where the hell you squirreled them away to.

Downeaster · Oct 23, 2019

Yeah, but after 50+ years of squirreling stuff away, ya tend to run out of space...

GLJ · Oct 23, 2019

Downeaster said:
Yeah, but after 50+ years of squirreling stuff away, ya tend to run out of space...

Space to put them or space to remember where you put them? :geek:

Downeaster · Oct 23, 2019

GLJ said:
Space to put them or space to remember where you put them?

Yes.

gggGary · Oct 23, 2019

I never save anything....

:whistle:

JRP1 texted looking for just the bezel for 74-75 gauges, had it.

geedubya · Oct 24, 2019

gggGary said:
I never save anything....

JRP1 texted looking for just the bezel for 74-75 gauges, had it.

BULLSHIT!!!!

gggGary · Oct 24, 2019

On the dual throttles;
While working on WJL's running, idling issues I found a rather large discrepancy in how far the idle stop arm is from the idle screw bracket with plates "fully seated" left to right carb. Not sure if this is something unique to this pair of carbs or a "thing" with early carbs. Anywho have adjusted my cable settings quite a bit and am waiting anxiously to fire it up again see how it runs, BUT, minor clutch worm project (more like wormhole) has me removing the swing arm and checking the bushings before it goes back together. It's never just one thing is it?

Mailman · Oct 24, 2019

gggGary said:
issues I found a rather large discrepancy in how far the idle stop arm is from the idle screw bracket with plates "fully seated" left to right carb. Not sure if this is something unique to this pair of carbs or a "thing" with early carbs.

Not just you. Same here! :shrug:

5twins · Oct 24, 2019

Take some pics sometime. This sounds like something that should be photo documented.

gggGary · Oct 24, 2019

5twins said:
Take some pics sometime. This sounds like something that should be photo documented.

Was already working on it.

TwoManyXS1Bs · Oct 24, 2019

Note to self,

Take pics of left/right throttle arms, idle screws backed out...

gggGary · Oct 24, 2019

All sets had the
screws backed out and the throttles "snapped shut" a couple times before shooting.

The set on WJL

The set from Jim; they have been through the ultra sonic a couple times, and a bit of scrubbing.

A random set from the tubs

a set from the weathervane man, I did a basic clean up and assembly they were in pieces in a coffee can of oil and solvent and a dirty tub when I got that bike.

Feel free to comment.

TwoManyXS1Bs · Oct 24, 2019

Um, ok.
With the exception of weathervane man's carbs, looks like the left carb has a smaller gap?

gggGary · Oct 25, 2019

Yeah I guess the take away is to not expect consistency on the bracket to stop arm distance.
Throttle cable setup has to start with the screws backed off and prolly a couple throttle shaft "snaps" to ensure the butterfly is fully closed.

TwoManyXS1Bs · Oct 25, 2019

Oh, man, last weekend hit 95°F. Last night got down to 37°F.
Like a damm lightswitch. Cold out there.

But, I got the pics.

They're not fully closed, each is 1/2 turn from fully closed.
Yup, a bigger gap on the right carb.

And now I see that you've already fixed your problem, and been grinding out the miles.

Seems that I'm always late to the party...

gggGary · Oct 25, 2019

TwoManyXS1Bs said:
Oh, man, last weekend hit 95°F. Last night got down to 37°F.
Like a damm lightswitch. Cold out there.

But, I got the pics.
View attachment 152731 View attachment 152732

They're not fully closed, each is 1/2 turn from fully closed.
Yup, a bigger gap on the right carb.

And now I see that you've already fixed your problem, and been grinding out the miles.

Seems that I'm always late to the party...

Nice thumbwheels!

Team Junk · Oct 26, 2019

36 here this morning. But it will be 80 tomorrow. Fall in central Texas.

Update: More fun with dual carburetor cables

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