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Tip of fuel mixture screw broke off

  • Thread starter Thread starter Paul's Zuki
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Paul's Zuki

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Need some help guys. On my 1978 GS550e, the fuel mixture screw (at the bottom of the carbs) has the tip broken off and is jammed in the hole. I have the carbs at a moto shop and they are also trying to figure this out. On a side note, I also had a second set of carbs that have the same problem. Does anyone know how to remove those broken off tips or have had experience with this before? I'm desperate to get this bike running. My deadline is next Friday the day before a show I want to take it to.
 
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Do a "titles only" search using the words broken mixture screw and you'll find one from the old technical forum. You can also do one as an all posts as I know this has been explained quite often.
 
I'm gonna try the scratch awl method. I really hope that gets them out.
 
awl does not reach over like in the picture of the write up I saw and one carb, I broke of a tip of a needle in the reverse side. Does anyone know of aftermarket carbs that will work on the GS550e? what other options do i have. 1 is good my #2, and the others are blocked.
 
I had broken tips in my old VM 550 carbs. Got the tips out with an awl.
 
I'm really having trouble lining it up. maybe i'm just frustrated. today was not a good day period. will regather and try again tomorrow.
 
got them out. had to use the sewing needle in some pliers method with a little tap and voila. Thanks for the advice. oh, I heated them up to about 400 in the oven and then waited to tap them afterwards.
 
one of the links to order these didn't work. do you know where I can order a set of fuel mixture screws?
 
anyone. have searched thread with no avail. bikebandit.com doesn't even show it's schematics.
 
Hi,

Give Z1Enterprises.com a call and see if they can help you. They don't list their entire inventory on their site, but they do carry idle mixture screws.



Maybe they'll have some that fit your carbs.


Thank you for your indulgence,

BassCliff
 
Why does the manual say not to disturb this scew, yet I've seen so many thread on the tips getting broken and jammed in there. Also it says that it cannot be calibrated in the field? what's all that about? also, any other ideas?
 
Hi,

Well, drat. It looks like the "rebuild kits" they sell for your bike contain the mixture screws.

<<Clickable.

Not a bad price for a kit, $22.30 each. You'll need four, of course. It's an option to consider.


Thank you for your indulgence,

BassCliff
 
Hi,

Paul's Zuki said:
Why does the manual say not to disturb this scew, yet I've seen so many thread on the tips getting broken and jammed in there. Also it says that it cannot be calibrated in the field? what's all that about? also, any other ideas?
Click to expand...

Due to EPA emissions restrictions, these were set at the factory (quite lean) and capped. The consumer was not supposed to mess with them as they were set at the factory to comply with emissions standards at the time. But in order to get the engine to run better it is necessary to adjust these properly. So we yank off the caps and adjust away. Some people screw them in too tightly and break the tips.


Thank you for your indulgence,

BassCliff
 
BassCliff said:
Hi,



Due to EPA emissions restrictions, these were set at the factory (quite lean) and capped. The consumer was not supposed to mess with them as they were set at the factory to comply with emissions standards at the time. But in order to get the engine to run better it is necessary to adjust these properly. So we yank off the caps and adjust away. Some people screw them in too tightly and break the tips.


Thank you for your indulgence,

BassCliff
Click to expand...


Makes sense. and I don't see the part I'm looking for in the image. I will try harder to look. Damn, always something with this bike
 
I think i found some off ebay. the whole shebang though, but doesn't matter.
 
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