Barry, sorry to hear your not so happy with the 1.60[&o]
If you decide to change engines and want to stay with glow, I would suggest either the Moki 1.80 or 2.10 for two stroke. If you want to go with a four stroke I think the Saito 2.20 would be the only choice but for about the cost as the big Saito you could have a real nice gasser for it and spend much less on fuel