1964 sport twin 9.5 hp will only run on full choke

[pthotts]

I INSTALLED NEW CARB KIT / REBUILT FUEL PUMP/ NEW PLUGS/ POINTS CONDENSER. THE LEAN / RICH FUEL ADJUSTING SCREW CAN BE TURNED ALL THE WAY IN OR OUT AND MAKES NO DIFFERENCE. HELP!

 

[racerone]

Did you remove the high speed jet found screwed into the carburetor bowl, yes or no ?-------It really should be removed for cleaning.-----On the parts diagrams it is called an " orifice plug "

 

[Hezekiah]

Also, I would recommend giving the carb a good soak.

I used GUNK Carb Cleaner - it comes with a basket that you place your carburetor in, and dip it in the solution and let it soak overnight. Bet that fixes your problem. Just be sure to remove any plastic or rubber pieces...unscrew your high speed jets (as racerone suggested) - and let all of the metal pieces soak.

Remove in the morning, wipe down and blow out with compressed air

 

[F_R]

Yep, symptoms strongly suggest the high speed orifice plug is dirty.

 

[pthotts]

thanks guys! put it in carb cleaner over night and re assembled runs great!