The only gas motor I have ever needed a starter on was a G-62. The DA 100 is an easy motor to flip by hand.
The Saito 180 stars much easier now that it has a few gallons of fuel in it but I use a 15 year old Tower Hobbies starter on 14.4 volts which is 2 6 cell 1500 mah car batteries and it starts a cold 180 very easily because the little bit of extra volts from the 2 6 cell packs gives it a faster spin up and a faster start. I also have a Sullivan starter and if I hook it up to the same battery pack it will not start the 180 where the 15 year old Tower Hobbies starter will...go figure.