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Carbs done valves set and hopes are high

  • Thread starter Thread starter crapwacker
  • Start date Start date
C

crapwacker

Guest
FINALLY got my carbs done, went with 110 mains, floats set at 26mm. Starting with idle jets at 1 1/2 turns out and air at 1turn out. Intake #1 was >.025 with a 2.70 shim. A local (45 Miles away) dealer just happened to have a 2.65 shim -sweet! couldn't do the shell game with the others so I got REAL lucky, because I'm getting pretty heated about getting her running like a week ago. Got a clean tank form TheCafeKid :dancing: so I hope to get the fire started tomorrow.
 
Always good to hear about another 750L being saved.1
Good Luck!!

Terry E
White Bear Lake, MN
79 GS750 L---waiting on a title and license but running great
 
crapwacker said:
FINALLY got my carbs done, went with 110 mains, floats set at 26mm. Starting with idle jets at 1 1/2 turns out and air at 1turn out. Intake #1 was >.025 with a 2.70 shim. A local (45 Miles away) dealer just happened to have a 2.65 shim -sweet! couldn't do the shell game with the others so I got REAL lucky, because I'm getting pretty heated about getting her running like a week ago. Got a clean tank form TheCafeKid :dancing: so I hope to get the fire started tomorrow.
Click to expand...

What is an "idle jet"? If you are talking about the pilot fuel screw, it should be set to 3/4 - 1 turn. The pilot air screw should be set to about 1.5.
 
Yah, you got em back-ards.... You'll end up rich with that scheme, and it may choke it into not starting at all..
 
crapwacker said:
FINALLY got my carbs done, went with 110 mains, floats set at 26mm. Starting with idle jets at 1 1/2 turns out and air at 1turn out. Intake #1 was >.025 with a 2.70 shim. A local (45 Miles away) dealer just happened to have a 2.65 shim -sweet! couldn't do the shell game with the others so I got REAL lucky, because I'm getting pretty heated about getting her running like a week ago. Got a clean tank form TheCafeKid :dancing: so I hope to get the fire started tomorrow.
Click to expand...

Looking at your sig line (thanks for having one, by the way :clap:), I see that you have a header and a K&N insert. The 110 might not quite be enough, but plug chops will tell for sure, after you get the rest of it sorted out.

Just wondering why you did not go with what are the generally-accepted standard settings for the mixture adjustments. The pilot fuel screw (the one on the bottom) should be 5/8 to 3/4 turn out. As a starting point, the air screw (the one on the side) should be double that, or 1 1/4 to 1 1/2 turns out. With the pipe on there, I would probably start with the fuel screw closer to 3/4 and the air screw about 1 1/2.

Just in case you did not see anything in your manual, here are two clippings from the carb 'sticky', which is the very first post in the Tech Forum:


ptm said:
1978 GS750E

Specs in mm.
Carb Type- Mikuni VM26SS
Bore Size- 26
ID# - 45030
Idle r/min - 1050 +/- 50
Fuel Level - 2.5-3.5
Float Height - 25-27 mm
Main Jet - #100
Main Air Jet - 0.7
Jet Needle - 5F21-3
Needle Jet - O-6
Pilot Jet - #15
Bypass -
Pilot Outlet -
Valve Seat -
Starter Jet -
Pilot Screw -
Pilot air jet - 1.6
Throttle Cable Play - 0.5-1.0
Click to expand...


Anonymous said:
I found this in my service manual.
It is for GS750 1976-1979 ,GS550 1977 - 1982

carbs.jpg


Check the Engine no. ,not frame no. Look for the differences on the same model!!!

I hope it will help
Click to expand...
 
I started there because that's about where they were when I dissambled them, but I shall heed the advice. I didn't go too big on the mains, but I have allens on my bowl now foreseeing just such a change
 
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