ORIGINAL: buzzingb
You may want to use JB Weld on the muffler to keep it from vibrating loose and keep all the exhaust going out the end. The engine runs great when adjusted properly but if not you will complain as other do. A very good engine for the price.
I took the advise of some others here at RCU and used High temp silicone RTV on the muffler mount and on the ported back part of the muffer. Naturally the one part of the muffler that was glued from the factory leaked like a sieve......