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FJ ... XJR1300

Started by Russfjr1, November 04, 2016, 08:29:16 AM

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FJ_Hooligan

DavidR.

RussTheEngineer

Hi all, interesting subject, the rebound energy will indeed rebound but ONLY to the length that the shock will extend to, if the force is greater than that will allow, the shock will simply pull itself apart.  The weakest point from experience is either the top or bottom mount gives way and falls off  and that's nasty.   Just be careful, think what you are doing, ask loads of questions and go for it.
 

Russfjr1

Quote from: RussTheEngineer on November 09, 2016, 04:32:26 PM
Hi all, interesting subject, the rebound energy will indeed rebound but ONLY to the length that the shock will extend to, if the force is greater than that will allow, the shock will simply pull itself apart.  The weakest point from experience is either the top or bottom mount gives way and falls off  and that's nasty.   Just be careful, think what you are doing, ask loads of questions and go for it.
 

Sorry minor point it will actually push itself apart. But with the rider weight or weights on board this could be counteracted in favour of the twin shocks. .... will get back to you.
It's about as useful as a chocolate fire guard
Current bikes in the stables

Yamaha FJ1200
Yamaha FJ1100
Honda Monkey-bike z50m 1967
Ducati Monster
Ducati ST2
Triumph Daytona 600 (daughters)
Honda CBR1000RR (daughters)

Cobblesmacker

Sounds like a big project. Don't forget all the equal and opposite force bits. The subframe isn't being supported, it's actually going to be supporting the weight of the riders and the bike. That's before you even think about the state of British roads and shock loading. If the shocks are angled correctly so that the cantilever in the subframe can transfer the stresses, then the weak points become the subframe mounting and the frame itself. A fun project indeed!
:diablo: