2018 Ec300 Jetting Specs

[Fieds83]

Originally Posted by Jakobi

NECW#3 will put you right between the 2 settings. You could try a richer diameter like a H, bump up the pilot one more, or tweak the air screw to get some punch back off idle.

The thing is, these PWK carbs have no squirt jets like a 4T carb gets. If you snap the throttle on a 250F for instance, the carb says yep and pumps fuel straight down its throat to give it punch. On the 2 banger you either have to run rich enough to have the excess fuel available and live with some burbling, or have smoother delivery and compensate with some clutch use.

I was weighing up between the necw and nedw. Might be worth a try.