Fat Cat:

I have 10 NexStars, all with 46AX's. The only problem I have had is fitting that engine into the plane. #1 problem is to keep from breaking the fuel outlet off the needle valve assembly (the outlet to the carb). You have bend the needle valve back enough so that you can clear that outlet when tightening the screw. Otherwise, there should not be any problems. Here the link with all the info [link=http://www.rcplanetips.net/important_engine_mounting_inform.htm]How to Install a NexStar Engine[/link] I hve not "shaved" any wood to make those engines fit.

Happy Landings!