We'd consider a 12 x 6 3-blade prop rather large for your engine. That prop's more suited to be run on a .91-size 4-stroke engine.

With a good-quality fuel, we've not seen any particular problems when the fuel/exhaust system's connected per the instructions. We would, though, recommend a fuel with castor oil in the mix because the engine's non-ringed.

We have no problems honoring the warranty. The difficulty comes when people think the warranty covers ALL problems. It only covers actual defects in parts and workmanship of the original manufacture. Not everything that happens to the engine, whether accidental or not.