There is an accelerator pump on the DF carb that will squirt gas when you twist the throttle.

Valve adjustment
https://docs.google.com/file/d/0ByFv.../edit?hl=en_US

Carb tuning Note DF carb is PZ30 like the PZ26
http://wem.walbro.com/distributors/s...CAEBURETOR.pdf