Below is a quote from another RCU forum by Bill Baxter reqarding torque values for OS engines:
"O.S. does not specify torque values. They really aren't needed. We've only used torque wrenches on certain gasoline-fueled engines, and then only on specific parts of those engines where the manufacturer states that tightening to a specific torque value is absolutely required.
_____________________________
Bill Baxter, Manager Hobby Services/Futaba Service/North America
3002 N. Apollo Dr. Ste. 1 Champaign, IL 61822 USA
Service Phone: 217 398-0007
Email:
[email protected]"
I would think that tighening the muffler bolts when the engine is hot would be my last choice. Use the Blue Loctite when the engine is at room temperature. As the the engine heats after start, the aluminum will expand to a greater degree than the steel bolt causing a more snug fit between the cylinder/muffler and the steel bolt.