RE: Why is the DA 75cc taking so long?
A 75 makes sense -the cost of doing a completely new engine is daunting.
The new ZDZ80J is completely new - bore /stroke/rod / porting system completely different
That means a complete re design of every piece in the engine.
That means if the the power increases (and it really did) the price must increase .
No free lunch ----
Here is a funny one for you -- the new Fords-
The 500 is really a reworked Volvo chassis-nicely done
The model which will docompetition with the Toyota and Honda (good luck)-has parts which interchange with ---Mazda.
If you can be competitive with off the shelf parts - more power to you.