Is there a way to keep the oil from leaking out of the gap between the front and rear halves of the muffler? I just bought the motor, and am breaking it in. The oil is "escaping" from the joint and covering everything from the joint sideways. While the motor is running, you can watch it bubble out. I have removed the locknut at the rear of the assembly, then the screw, to see if there was a gasket or a seal at the mating surface. There is none evident. So I reassembled the screw and made it tight, and tightened up the locknut. Still blows oil while it's running. I don't think its a major problem, it just makes a big mess. Any suggestions? Thanks.

Oil will normally leak from between the muffler pieces, especially if there's a small rough spot in the castings.

One problem with tightening the long bolt is that if it's too tight, it will break. The muffler will expand as the engine warms up and will stress the bolt. Eventually (a few flights), the head of the bolt will be snapped off and you'll lose the back half of the muffler. We tighten the long bolt just enough to keep the rear from turning and then use the lock nut to retain the long bolt.

I will remove some of the torque immediately. Thanks for that. I took the Kadet up for it's innaugural flight just tonight. The 46 flies it just fine. The oil just makes a mess of the side and the front (windshield) in just one flight, but it's not hard to clean. Also, the screw that holds the throttle linkage has now come loose on me twice, causing the engine to only go to idle, and off. What would you recommend to use to keep the screw from loosening? I don't want to reef on that assembly too much, I was thinking about some locktite.