I vote for mkirsch also. I had that very thing happen to me this weekend on a new saito 120. Ran good for about 3 tanks on the engine stand and was finiky at idle mounted 90 deg in a sukoi. It died imediately when I removed the glow driver. I dont remember which way I turned it but It got better after several times tweeking. I will also replace the stock plug with an OS-F.
Edwin