The Jon Lowe Cook Book for the OS 1.60FX is now on the support section in the Custom Airframes of America website. If you follow what the cook book says you will have no problem. My son and I used the OS 1.60 just as Jon stated and we had no problems at all. It has plenty of power and was easy to start. The first starting was the only tricky one because you could flood the engine easy, but once the engine ran the first time it would backfire flip first time every time all day without every repriming. I would suggest to change the original bearings after a couple of months of flying and install a high quality Boca bearing. We did not and the rear bearing failed and caused the crankshaft to twist in half just in front of the rear bearing. In flight we lost all the main parts to rebuild the engine and it was cheaper to just buy a new one. Just follow what Jon suggests in the cookbook, pipe, perry pump, prop and you will love it.

Larry