Loss of Top End Power

[Emcee]

The intake tube slides into the carby and makes contact with the O ring inside, thus sealing the intake from possible air leaks...just press the carby and intake firmly together while tightening it together to assure good, firm contact.

Is there supposed to be a o ring here or on the side of the choke in the photo I posted above?

 

[DAMIEN1307]

Is there supposed to be a o ring here or on the side of the choke in the photo I posted above?

The O ring seats itself right inside the carby in the pic you are showing...Those four grooves on that outer housing that the intake tube slides into is where the air leakage occurs on these carbys when no O ring is used...The O ring inside prevents that from happening.