ORIGINAL: Augie11
14x6 should be about right for that Saito or perhaps an APC 14x7. I'm perplexed at why a Telemaster would stall below 3/4 throttle with any .91 4-stroke up front. Have you tached the engine at all at full power and at idle? Something is strange here.
It can't be the engine, The Sr. will float in as well with the engine running or dead stick. I flew mine with an old OS .61 and it was just fine.