Dellorto PHBN needles and jets

Dellorto Needle Carb Fuel Mapper™ software - https://www.paypal.me/ecih/20 https://fuelmapper.com/ Understanding why the main jet may require changing, when a different needle is used. Because the needle continues to obstruct the fuel flow at wide open throttle........ by changing the needle to a sharper point, the main jet must be reduced in size. Warning Note: Always tune from a rich setting, to safeguard the engine. A 'wide open throttle run' must be carried out, and the spark plug checked, to confirm that the main jet has been set correctly.