We used to have a sunl70. Sometimes it was hard to start. A combonation of 3 things turned it into a surprisingly reliable little machine. Properly adjusting the mixture screw and moving the E-clip to a richer position were the two dealing with the carb. The other was adjusting the valves. Here is an internal link for adjusting the valves. The whole thread has good info in it. You may find other threads with the search feature as well.
Kazuma Mini Falcon Deluxe is a HARD start
