I posted this on the DL Side-by-Sde thread, but thought I see if I could get any thoughts here.

I was doing some reading on several boat and scooter hop-up sites and there are quite a few small intake/velocity stacks available for the Walbros used on DL/DA engines. From what I gather they're claimed to produce a bit more torque in the mid-range due to cleaner airflow through the carb throat. They do add about 1.2" or so to the length of the carb, so it would probably necessitate a hole in the firewall for clearance.

Anybody tried these on any of the 50cc aircraft engines?

Earle