RE: Great planes ultimate 160
OldFart1,
Though it's been a while since I had mine, I can tell you that I had that problem on a few other planes and all I did was use a thinnier nut and star washer and some blue loctitie, worked well.
clarkj,
I would thing the Satio 180 would fly it fairly decent for general sport flying. Without looking, the 180 probably has the output closer to the OS160 and should do well. If not you can always up the nitro ratio to 30% oon the Saito, they love that amount of nitro, but it's not cheap
Inyosi
There is a website that specifically shows the best place and way to do the smoke tap but for the life of me I cannot remember it. The key is to get it as close to the engine exhaust port as possible but you need to be careful to not allow the smoke oil to "backflow" into the engine as it wil flame it out quite quickly