I disagree Paul.
I think there's less risk of vibration induced fractures in solid mounted exhausts than with the rubber mountings.
The factory didn't do Laverda owners any favours by bolting the exhaust cans on via flexible mountings. In my opinion it's poor design.
You don't have to be Einstein to understand why. Having any structure solidly fixed at one end and flexibly mounted at the other is asking for trouble. The only way the exhaust system can accommodate the different movement between the solid end and the rubber-mounted end is by bending somewhere in between the two ends.
Rubber mounted exhaust systems only make sense if the engine is flexibly mounted, or if there's a flexible connection between the headers and mufflers.
My old 1200 triple (sold it a long time ago) had a habit of cracking the 3-1-2 collector. I had to weld it up a couple of times. I figured the problem was the cans being able to waggle around on their rubber mounts while the headers were solidly bolted to the engine. Bending at the collector was causing fatigue cracks. So I replaced the rubber muffler mounts with simple alloy spacers bolted up tight and never had any further problems.
Very few bike manufacturers use rubber mounted mufflers with a solidly mounted engine and headers. Actually, I cant think of any other than Laverda.
PS: Despite my views expressed above, my Jota still has its rubber mounts for the mufflers. That's only because the Redax big bore exhaust system on the bike hasn't fallen apart yet, so I've not had any incentive to change to solid mounts.
