I'm not familiar with this engine but something to consider if it uses reed valve induction

In regards to the engine problem,3W has this issue on some of the 50cc engines that use reed valve. I know because I have had it happen to me.

All the flipping in the world does nothing.

For the first few flights it ran like a top, then one day it took forever to start it then the very next flight I could not start it. Tried everything that was already tried in the posts on here and one day I pulled the carb off. Low and behold I found a piece of balsa that had wedged itself in the reeds that I had cut out for a servo mount thus holding them open. Removed the wood, engine ran flawless again

Fast forward to two days ago

Say exact problem, first flight starts up the same as always. Next flight nothing, nada. Pulled the engine thinking something was hung in the reeds because I had just installed a smoke tank and had o cutoff a wire tie so I'm thinking I left the cut tie in the plane and it ended up in the reeds again. Nope noth the problem but I did notice the reeds were not closed all the way. Took them out, flipped them over. Now the engine starts just like it used to.

Called Aircraft International and ordered a new set of reeds. Original set was some kind of plastic and had warped, new ones are supposed to be better

Moral is, look at the reeds. If this engine has them, then I'll bet they are not closing all the way which will seriously lean the engine. You can test this by putting some gas directly into the carb (prime) and flipping to see if it at least pops. In all cases mine would but would not keep running once the "prime" was burned off. This test is by no means valid but still look at the reeds if so equipped