I threw away the plug that came with the Moki 1.35 and, for now, cannot remember why I did that. Because of the compression of this engine, a hot plug similar to what is used with 4 strokes was recommended. Find any other plug to rule out the plug as the problem.

There is another thread going on where some one in Texas added a modification to his Moki's Low Speed Disk. What it involved was cutting out a shim (washer) out of material from a common plastic milk jug. The reason for that was to resolve a problem with the engine cutting out while in flight. The shim lines up the hole in the disk with the long groove cut into the throttle bar (or whatchamacallit). I have cut out and installed the shim, but have yet to fly the Moki. After changing out the plug, you might want to try that.

SA Flyer