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Throttle won't close all the way

  • Thread starter Thread starter giganticflying
  • Start date Start date
Nessism said:
Boiled a carb in lemon juice (diluted of course) and it turned dark. Never again. Gunk or Berrymans's carb dip is much safer in my experience.

I agree with minimizing the dip time to minimum required. Throttle shaft seals are rubber and don't need any more exposure than necessary.

Mr. OriginalOwner, feel free to check the carb rebuild tutorial linked in my signature. Even though you have some experience with old bikes, it won't hurt to learn some specifics about the GS Mikuni's.

Good luck
Click to expand...

I got the carbs ganged back together, chokes on and bench synced yesterday -- they're ready to go back on the bike but I'm a little "wrenched out" right now. Heh! So, maybe this week.

And yes Mr. Ness -- I followed your carb rebuild tutorial every step of the way. At every turn, you were right there with me answering every single question I had. It was up on my bench computer the whole time!

I'd like to personally thank you for your efforts in making it available to me -- it's value is incalculable.

:clap:
 
OriginalOwner-the throttle on the handlbar is frozen, in the carbs it open and close fine.

I'm going to just dip them one at a time. Since this is my first time I'm terrified of separating the parts from the bodies and forgetting where they go. Classes start back up on Monday anyway so it'll give my a little after school zen without being too overwhelming.

I'm just going to start a thread for the throttle issue when I get there.
 
I know you don't want to hear it, but if your not going to tear em apart and do it right, there is no sense in doing it at all, one blocked passage, one bad O ring and they will work like crap and your going to be chasing your tail trying to figure out why the bike is running like crap.

You have the tutorial, follow it, the parts you take off can only go back to where they came from, do one at a time if you have to, or do all 4 at once, get yourself 4 containers and keep parts from each one in it's own container.

you could have a binding cable, stuck in the sleeve, or a broken throttle tube, or the cable jumped off it's track in the throttle tub, you should take all that apart and see what is going on, it's the only sure way of finding the issue and fixing it.

It seems daunting, but it really not....

this is one of my carbs, all apart, and I had no extra parts once I put it back together, just follow the write ups...

P1060244.jpg


and once done

you too can have a nice rack of carbs, just like this

P1060855.jpg
 
giganticflying said:
OriginalOwner-the throttle on the handlbar is frozen, in the carbs it open and close fine.

I'm going to just dip them one at a time. Since this is my first time I'm terrified of separating the parts from the bodies and forgetting where they go. Classes start back up on Monday anyway so it'll give my a little after school zen without being too overwhelming.

I'm just going to start a thread for the throttle issue when I get there.
Click to expand...

Don't worry so much. Take them apart. If you get stuck just ask us where the parts go. Just learn how to post photos to Photobucket so we can see what you are having troubles with.

Here is a link to the VM carb rebuild tutorial...http://www.thegsresources.com/garage/docs/vm_carb_rebuild.pdf

Keep the slide parts together, soak them as a unit since the needle parts don't need to come apart.

The slide should stay together with the carb body so mark the parts with a scribe. The only other parts that need to stay together are the float needle and seat. Everything else can interchange without concern.

Good luck
 
Take a pointed punch and make small dots on the back flange that faces the mounting plate. #1 is 1 dot, 2 is 2 dots and 3 is 3 dots. 4 doesnt need any dots.

Now get 4 quart size ziplock baggies and number them 1-4. Take apart carb 1 and put everything in baggie 1 etc etc. Now all you have to do is cycle them thru.

But in all honesty,,do you think any of these parts were specifically fitted to any one carb at the factory...NOPE!! So, the moral is that you can tear them down and lay everything in a huge pile and not screw anything up. reassemble just like they did at the factory building them..pick up a piece and out it in a carb...done.

I never worry what slide came from where Ed and I dont have any troubles...its not a critical thing in my opinion anyway.
 
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giganticflying said:
OriginalOwner-the throttle on the handlbar is frozen, in the carbs it open and close fine.

I'm going to just dip them one at a time. Since this is my first time I'm terrified of separating the parts from the bodies and forgetting where they go. Classes start back up on Monday anyway so it'll give my a little after school zen without being too overwhelming.

I'm just going to start a thread for the throttle issue when I get there.
Click to expand...

As was mentioned, take the two Phillips-head screws out of the handlebar throttle housing and it'll come apart in two half moon pieces. The problem will likely be obvious once you have a look inside.

Don't sweat the carbs -- you can do it. My tips are as follows:

1) use the right size screw driver and use it assertively -- make sure you don't slip or strip.

2) I like to use a muffin tin to keep the parts in. I put in a small numbered slip of paper inside the first cup on the tin and use that row for the different sections of the carb.

3) Old guitar strings make great carb cleaning tools and give you a variety of different sizes. I also use the small E string as a feeler gauge to bench synch the carbs.

4) Mr. Ness's tutorial is invaluable and will likely answer every question you may have. Keep it close-by if at all possible.

Everyone here offers good advice and hopefully some encouragement too. At times it may feel like it -- but it ain't brain surgery.
:lol:
Don't hesitate to ask.

Good luck!!

:D
 
As of tonight, the carbs are 100% disassembled and one carb body is in the can! Everything is there, nothing is stripped and it all actually looks pretty clean except for some debris in the bowls. Maybe they were cleaned at one point? Or because it has low miles?

Thanks for all the help everyone. I'll post pictures as soon as I can get them uploaded.

Question: Since I have the o-rings ordered, can I just clean the brass pieces with them on so I don't forget what size goes on what?
 
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Robert will have a sheet in there with directions. basically you just need to be sure which ones go to the pilot and /or air screws because they are very close in size. Ther rest bare pretty self explanatory.
 
giganticflying said:
Everything is there, nothing is stripped and it all actually looks pretty clean except for some debris in the bowls. Maybe they were cleaned at one point? Or because it has low miles?
Click to expand...

Dip the float bowls too if you haven't. The choke pickup passage tends to clog up.
 
giganticflying said:
As of tonight, the carbs are 100% disassembled and one carb body is in the can! Everything is there, nothing is stripped and it all actually looks pretty clean except for some debris in the bowls. Maybe they were cleaned at one point? Or because it has low miles?

Thanks for all the help everyone. I'll post pictures as soon as I can get them uploaded.

Question: Since I have the o-rings ordered, can I just clean the brass pieces with them on so I don't forget what size goes on what?
Click to expand...

Don't leave them on because a lot of the crap forms behind the o-rings. Take 'em off.

Here's what I did while waiting for my o-rings; I removed the o-rings and cleaned the part, then I put the old o-ring back on so I wouldn't forget which goes where and what pieces actually get the o-rings.

If you roll the old o-ring between your thumb and fore finger, all of the crap falls off.

In the end, I probably didn't need to put the old ones back on but it put mind mind at ease during the process.

Sounds like things are going well with your rebuild.

Great job!!

;)
 
I've got the top, bowl, and body in the can. I'm just going to wait to clean the small bits until I get the o-rings just in case. I'm probably being to careful, but I'd rather err on the side of caution.

There was some gasket residue on the bowls, but I imagine it'll come off easier once they're dipped.
 
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One more question: I disassembled and cleaned the slide on the first carb, but it was pretty clean, and the rest of them look pretty clean also. Could I just get away with spraying them down?
 
They generally dont get too dirty and a rinse with spray and some steel wool on the outsides will usually suffice.
 
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