Ruined carbs - help needed

[mobius]

Well after spending hours upon hours of cleaning and dipping the carbs. I finally re-assembled the 4 carbs together using brand new allen bolts (the phillips heads were stripped badly). I finally sat down to "bench sync" the carbs and as I go to adjust the sync screw between 3 and 4. It was a bit stubborn to turn so I used a bit more force that i probably needed to. I assume the piece was weakened somehow before because as I tried to turn the screw, pop comes off the carb piece holding the screw.F*%&. I am extremely desperate right now....
As it stands, carb #4 is basically useless since the throttle lever can't do
I'm not sure if they can be welded together, I'm looking for suggestions on a fix for this, if at all possible. is there any way to replace the pivoting assembly altogether? Or can i build some type of small vise-thingy to connect the throttle lever to carb #4.

Also, If anyone has a spare set of carbs I would be willing to buy the entire set . This is on a '81 gs550t.
Please, I need help.

[hampshirehog]

I've seen these fixed with what looks like Araldite. And a guy at a show did a demo of Durafix welding (actually more like a solder) on a set of carbs - looked pretty strong.

[tom203]

I've seen these fixed with what looks like Araldite. And a guy at a show did a demo of Durafix welding (actually more like a solder) on a set of carbs - looked pretty strong.

Yes, it's probably steel, so could be welded or brazed fairly well!

[mobius]

I've seen these fixed with what looks like Araldite. And a guy at a show did a demo of Durafix welding (actually more like a solder) on a set of carbs - looked pretty strong.

Yes, it's probably steel, so could be welded or brazed fairly well!

Given that I have no welding equipment/experience, where can I take the carb to have the piece welded in place?

This bike has been nothing but headaches....sigh

[chef1366]

shoot, I have a 2 and 3 but no 4.

[mobius]

shoot, I have a 2 and 3 but no 4.

Murphy's law is in full effect with this motorcycle.

I've been thinking for the past few hours and I came up with what I call a "desperate-man's solution"

Do you all think I could get a U-shaped piece of metal and screw it tight to the bottom part and have an adjustable bolt and nut on the top (above the throttle lever) and have that function as the linkage between carbs 3 and 4?

I've hit rock bottom..don't know what to do!

[Vantreeseba]

If you can post some other pics, or if anyone knows if a gs450ga carb will work for that, I have 2 extra carb bodies I would part with for 10 bucks (each) + shipping. I ripped most of the jets and stuff out of them for my current set, so I don't need the bodies or anything.

[chuck hahn]

it just pot metal basically and very porous. I would try to get the screw and lock nut free first and working freely. Mix up some JB weld and squish it into the pores on each piece and set it back together and maybe a bit on the outer edge where it will be out of the way. Hey its broke now so you got nothing to loose.

[mobius]

If you can post some other pics, or if anyone knows if a gs450ga carb will work for that, I have 2 extra carb bodies I would part with for 10 bucks (each) + shipping. I ripped most of the jets and stuff out of them for my current set, so I don't need the bodies or anything.

I have the Mikuni BS34SS carburetors -'81 GS550T. I believe the 450's have a bore size of 34mm (BS34SS), which would not correspond to this model.

Does anyone know if the 650's used the same carb body as the 550 but with different jet sizes? My carb has all the components in very good shape and can replace them into a 650 carb #4. is that possible?

Any ideas?

[chef1366]

I have the Mikuni BS34SS carburetors -'81 GS550T. I believe the 450's have a bore size of 34mm (BS34SS), which would not correspond to this model.

Does anyone know if the 650's used the same carb body as the 550 but with different jet sizes? My carb has all the components in very good shape and can replace them into a 650 carb #4. is that possible?

Any ideas?

You can use the 650 carbs but not the 750/850.
Actually the spacing is different on the 2 and 3 carb on the 750/850 but the 1 and 4 are the same.

[Tom R]

I'll +1 on the JB weld or something similar. A) It's hardly pushing anything at all since the spring is on the other side, B) only special equipment required is a toothpick and C) as was already stated - There's nothing to lose.
I did this on the stop for a miter box, which was under considerably more stress and impacts, and it held for years (unfortunately I use my miter box more than my bike).

Edit - After looking at a set in my basement, I was wrong - it is under stress of the spring. I no longer think JB weld is such a good idea.

[mobius]

question: If i were to replace the #4 on mine with one from a 650, what is the significance of the number that is on the butterfly?

Mine says 140, but the 650 says 135?? would I need to change those too?

[chef1366]

question: If i were to replace the #4 on mine with one from a 650, what is the significance of the number that is on the butterfly?

Mine says 140, but the 650 says 135?? would I need to change those too?

If you sync them the numbers on the butterfly won't make a difference.

[Nessism]

This is an easy fix. No reason to fret.

Those adjuster pieces are attached to the throttle shaft with a small roll pin. You simply need to find a small nail of the right diameter to drive out the pin, install a replacement piece, and then put the pin back in. I should have some of those adjuster pieces. Shoot me a PM if you want to get one and/or discuss further.

[mobius]

Some more pictures of the adjuster, with the carb taken off the set. Posted for Ed.