Darryl is right tiger, this is not the right place to continue. As a final response, the 92508 and 92908 were the same engine with a different carburetor/fuel tank. The reason the early 1980s Rover 92508 was quiet, was the large and effective muffler it had. Briggs offered the big muffler and the little pot muffler as alternatives, and mower manufacturers chose what they wanted. On my 1976 mower, Victa specified the little pot muffler - perhaps the bigger, better muffler hadn't been introduced at that time, or perhaps they were crazy. More likely, because the engine was laid out with the cylinder crossways on the Victa, and longitudinally on the Rover, perhaps there wasn't room for the big muffler running crossways on the Victa, because of the high arch grass chute. On my 1983 mower, Rover specified the big muffler, and I'm very glad they did. That one change made their mower a nicer machine.
