Dellorto Needle Carb Fuel Mapper™ software - www.paypal.me/ecih/20
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.
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