I have also had cracked pipes on my 912 Classic. Both rear outlet pipes
found cracked at 470hrs. Both cracks were approx 3inches long on top, under
the carbs, along the bend plane. R/hand side crack had commenced to go
radial.
---From 0hrs the silencer was supported with a strap around the rear and then
via a piece of conveyor belt, about 1-1/2 inches wide, around the large
cross tube of the engine mount, to absorb vibration. To no avail of course!
No insulation has ever been used. I operate from both smooth a rough strips,
but do not think this is the cause. It's just cyclic vibration and age
hardening of the older mild steel pipes. I have changed all four pipes from
the heads with stainless types. Hoping to get a longer run.
Regards,
John Baker, VH-BKR
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