A .46 on a 4 lb KAOS will make it go at an unbelieviable, if not an uncomfortable speed. I would go with a .40FX or even a .35FX. Even the plain bearing .46FP would be a lot of engine. I have used OS, K&Bs, ThunderTigers, SuperTigers, Magnums, and Enyas in my KAOS's, and my favorite pick would still be the O&S. My current KAOS has a OS .46SF that I have been flying with every season since 1992. They may be a few dollars more, but they make up for it in dependability.
ORIGINAL: Ab_jose1
Someone said to buy an OS ax 46. I just want the most reliable engine possible not shooting for speed because it’s already been lightened. Weights about 4 pounds so it extremely fast.
Would want 3 examples of reliable engines.
Jose