Robert,
Do the throttles have those little spring loaded "buttons" on them?  If 
so, they could be "leaking".  I cut them off and solder up the holes. 
 (Makes for a better idle).
Kevin V.
Robert Sexson wrote:
>I need a little advice on a carb adjustment. Valves
>and timing are correct. The engine will idle smouth
>but will start backfireing out the carb at about 3000
>RPM. If i increace the mixture it will reach higher
>RPM but won't idle right. Any suggestions? This is a
>1275 in a 74 Midget.
>
>R Sexson
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