The more I think about it, the more I think you will want to wait for a bubbless tank to run. I know you are itching to get it out onto the water and the rest of us want to see that sucker fly, but is it worth the risk of frying a $300 Jett engine for a $25 tank?
Running the engine on the test stand with the tank padded as shown in the above pics gave no bubbles even up to 18,500rpm. I do however have a homemade bubblefree tank that uses 8oz baby bottle liners. It works well, but the engine I made it for burns that tank up in about 3-minutes if not less.. (15cc).
I wil test run the engine in my driveway on the boat in its cradle and run it up to look for bubbles. If I see any I will swap my custom bladder tank and try it.
My SuperTigre s29 turns over 17k and never had bubbly fuel/lines so another 600-800rpm shouldn't make much of a difference.
I spent all my money on the engine, nothing left for a $30 fuel tank. Besides, I have a 5wk old baby now.... Money really doesn't exist now.. LoL.
Andy mentioned the same thing on RCAW... Trust me, I won't fry this engine.