ORIGINAL: vanguard
Has anyone else had an issue, on the DL50, if stripping the prop hub threads. I have done it for the second time. Was changing props and doing the initial tightening when I heard it pop. At first I thought it might be a broken bolt, but the bolt is fine. I have ran this engine and a DA 50 for about 3 seasons now, so its not a case of not knowing how to tighten the bolts. Using the same method and tools on both engines. In fact I have changed props many times on the DA with out any issues.
My guess is you're over tightening the bolts. I have two DL 50s with no problems there (or anywhere). I've had the one engine apart a few times and had the prop off many times with no problems. It doesn't take as much torque as one would think to get the prop bolts sufficiently tightened (but I don't know what the actual torque spec. is).