Main Jet Setting, please help

[GMSKEE]

Hey Guys I have a 78 GS750 with the VM Carburator. The bike seems to running very lean which is making me think that the main jet is open too much. can anyone help me on a close to standard setting.

Thanks in advance

 

[tkent02]

102.5 .

 

[GMSKEE]

I mean how many turns out. Im talking about the screw on the bottom of the carb, I thought that was the main jet.

 

[tkent02]

That's the pilot fuel screw.
It controls fuel at an idle, or slightly open throttle.
5/8 or 3/4 turn is good for starters.

 

[Guest]

That's the pilot fuel screw.
It controls fuel at an idle, or slightly open throttle.
5/8 or 3/4 turn is good for starters.

Good answer.
I was gonna say, read http://members.dslextreme.com/users/bikecliff/images/vm_carb_rebuild.pdf

 

[gs road racer]

Air leak? Intake O-rings? Vacum line?Dirt? Change anything? Like exhaust or filters? How do you know it's lean?



Randy

 

[GMSKEE]

Thanks for the replies. I meant rich sorry, the plugs are wet and fouled and they are new plugs and my Pilot Fuel screw is at 1Turn now. Also exhaust smells very gassy. Ill try turning the screw down more and see what I get. Thanks for the help

 

[Suzuki_Don]

Thanks for the replies. I meant rich sorry, the plugs are wet and fouled and they are new plugs and my Pilot Fuel screw is at 1Turn now. Also exhaust smells very gassy. Ill try turning the screw down more and see what I get. Thanks for the help

Shouldn't you be turning the fuel screw UP/in to get to 5/8ths out from fully seated.

 

[Gerald]

Good answer.
I was gonna say, read http://members.dslextreme.com/users/bikecliff/images/vm_carb_rebuild.pdf

Thank you for the link. I was having the same problem