As you close the excessive-velocity Needle Valve, the engine will begin to run smoother and the RPM's will rise.The engine will continue to hurry up as you close the Needle Valve till you go the optimum gasoline setting.needle valve till you go the optimum gasoline setting. At this level the engine will begin to decelerate as you lower the gas going to the engine as it is now too lean. When this occurs, instantly open the needle valve a few clicks! If you happen to run the engine at a lean setting for more than a few seconds it is going to damage your engine.

More products of valves

Cast Gate, Globe, Check Valves

Ball Valves

Check Valves

Plug Valves

Balance Valves