Cory... the older ZDZ's used to have a routine to start them (5-5-1 method) but the newer ones (210, 160, 180, 112, 56) that I have played with all start like any other motor. The rotary valve gives them a very strong mid-range but if you don't setup the headers for the appropriate can or pipe, they will be peaky or flat just like anything else. They are smooth running, but again, no different than most other motors.

They do spit a bit of fuel out the carb, but nothing a little baffle can't manage.

And ZDZ is smart and don't make a big deal about their versions, LOL. I have seen 3 different versions of ZDZ180 and ZDZ90, but they remain tight-lipped about it so never a discussion about whether it is a V1, V2, or V3. The Chinese and Taiwanese should take a lesson there, LOL.