Exhaust mounts

chrisk

chrisk

Hero member
Location
Brisbane, Australia
I've been playing with motorbikes for an age. On all my bikes, bar 2 Jotas, the exhausts have all been solid mounted.
I'm thinking of a solid mount on my SF project ......... any reason why it needs to be rubber mounted at the muffler?
My way of thinking is if it's rubber mounted, all that wobbling about at the back has to take its toll on the exhaust gaskets up the pointy end.

(dunno) Maybe I'm missing something.
 
Sounds reasonable Chris.

Every other bike I can think of has solid mounted exhausts and I've sometimes wondered why Laverdas have the flexible rubber mounts. A lot of Laverda triples suffer from fatigue cracks in the  exhaust collectors or muffler spigots. I suspect the rubber mounts may actually contribute to problem because they allow the exhaust cans to move about a bit.

One of the rubber mounts on Tim's 3C fell apart years ago and he made up a solid mount as a replacement (bolted straight through with a wooden block spacer to replace the rubber block). It was on the bike for years with no problem. I only replaced it with a rubber one when I re-commissioned his bike a few years ago. Maybe I should have made a solid mounting for the other side instead.

Rubber mounted exhausts really only make sense on 120? triples that have rubber mounted engines.

 
Well, why would the factory have gone to all the trouble of designing a rubber mount system when contemporaries were rigidly mounted?
I don't know the answer but would hazard a guess they fitted it after testing various options.
 
When I fitted Ducati Contis to my SF1 I solid mounted them to the pillion peg bolt. Lasted for years with lots of very high speed/rev work, racing, general thrashing, outback WA speeding, but did eventually get cracks in the mufflers winding round the circumference - had them welded up and eventually gave them away to a mate when i fitted the SFC 2/1 I've never had a prob with the rubber mounted SFC sys even with a 'silencer' section added - and I never used the SFC mount under the oil drain plate.

Brother Tippie tells me the go is to rubber mount the mufflers but hard mount the headers to the frame near the muffler joint ... makes sense.
 
Genuine Conti mufflers are reasonably well made, but cracks are not unusual after many years of use. They generally crack at or around the mounting tab or close to the spigot that slips over the headers. Sometimes the baffle breaks loose inside and rattles around too. I've repaired several sets including the ones on my MHR. Broken baffles can be a pain to weld up, sometimes involving open-heart surgery.

To restore the original look, they need to be filed smooth, polished and re-plated after being welded. The problem these days is that chrome platers are not too enthusiastic about contaminating their electroplating tanks with dirty old exhausts.
 
What seems to work best is another rubber mount where Quentin says. This will stop swiveling movement as has been a discussed problem.  It works on mates SF twin pipe racebike and is used on dirt bikes. My solid mounted Transac Conti copies have both needed the mounts rewelded and send all the vibration to the pillion pegs.
 
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