Thunder Tiger .91 four-stroke Eng.
I have one and love It(cant beet it for the money. I had in 1/4 scale spacewalker 10.5 pounds plenty of power. Easy starting, runs great, no deadsticks.
Only problem I found after running screws loosening, so after a couple of runs give it a good check and maybee locktight.
Putting it in a .46 giles kit cant wait