Home › Forum › Ask A Member › Flow-Chart for OMC Carburetors?? › Re: Flow-Chart for OMC Carburetors??
Those 2 holes are an air intake to emulsify or bubble the fuel before exiting the carb..as in main air bleed. Helps with vaporization. The small end is where the fuel exits into the venturi. Put a hole in your soda straw above the soda and suck. Thats what the 2 holes do.
When at low speeds the float level is higher than at full flow. So at idle the level in the bowl is high. Crack the throttle and the fuel level starts out high but soon gets drawn down to steady state. Tapered float needle is why that happens. That gives some accelerator enrichment without a real accelerator pump.
Looks as though that carb varies the float bowl vent pressure to control hi speed mix..