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Newbie needing carb help

  • Thread starter Thread starter drewaugie
  • Start date Start date
D

drewaugie

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This may be a dumb question but I have a 77 GS750 that I've been tuning up and teaching myself how to work on bikes with so I've had a lot of dumb questions lately.
Just recently I noticed a very slow gas leak coming from one one of the carbs. I took them off again to clean them out and replace gaskets and o-rings and noticed the leak was coming out of this jet (pic below) on all of the carbs. I got ahead of myself and took one of them out and later found in the service manual to leave them be as they are set in the factory for each individual carb. Now I'm wondering what jet this is and how to adjust them myself. As I said I've been trying to teach myself all of this and am usually able to find answers on this forum (which has been a huge help, thanks guys!) but since this is just "a jet I shouldn't touch" I haven't been able to find any info on it. So any answers or resources would be greatly appreciated. Thanks.

IMG_1075-1.JPG
 
The only way gas can come out of the fuel screw is a bad o-ring.
Check and make sure the fuel screw tip is not broken off in the throat of the carb.
 
Well, the bad news is that, you didn't really clean your carbs.

Order some O rings from cycleorings.com, take those pilot fuel screws out and properly clean the carb bodies as shown in the tutorial above

Disregard what it says about the factory preset.. You may find marks that indicate the preset position, but about 3//4 turn out from lightly seated is about right
 
Thanks SVSooke, that's exactly what I was looking for. Must have missed that on the Basscliff site. I never actually got around to cleaning them last night, just took the pilot fuel screw out to inspect it and then noticed the warning in the manual. I have carb rebuild kits that have all new jets, o-rings, and gaskets so I'll just use those for now. But thanks for the cycleorings site. That will definitely come in handy later.

I'll start out with all of the pilot fuel screws out 3/4 of a turn and see how that goes. Thanks guys!
 
drewaugie said:
Thanks SVSooke, that's exactly what I was looking for. Must have missed that on the Basscliff site. I never actually got around to cleaning them last night, just took the pilot fuel screw out to inspect it and then noticed the warning in the manual. I have carb rebuild kits that have all new jets, o-rings, and gaskets so I'll just use those for now. But thanks for the cycleorings site. That will definitely come in handy later.

I'll start out with all of the pilot fuel screws out 3/4 of a turn and see how that goes. Thanks guys!
Click to expand...

The pilot fuel screws should be set to 2 1/2 COMPLETE turns out from seated. The 3/4 information is incorrect for a CV carb.

Error: This is for CV carbs and yours are VM.
 
Last edited:
JTGS850GL said:
The pilot fuel screws should be set to 2 1/2 COMPLETE turns out from seated. The 3/4 information is incorrect for a CV carb.
Click to expand...

But isn't his 77 GS 750 of the VM series. If so, then the 3/4 out would be correct.
 
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