On 04/08/12 08:47, Jim Wilkins wrote:

The engine on my lawnmower doesn't shake, so I replaced the rusted-out
muffler with stainless flex hose and a larger muffler. Most of its
remaining sound is mechanical, the putt-putt is muted. It's a
cast-iron B&S from the 1950's and considerably quieter than modern
aluminum engines.

Thanks for that info.
I have a simlar beastie that needs a new muffler after a major carb
overhaul.