Spoonz, what causes the 04> plate wear down on the inside to 3 or 4 mm. Is there an issue with a certain amount of free play in the shock linkage?
It varies from bike to bike but on mine and Garins the dogbone is eating into the left side of the linkage. In Garins case it gouged deep grooves in the plate as well. There is nothing to stop the dogbone making direct metal to metal contact. Normally that contact is minimal but in some cases it looks like the dogbone is held against the plate with some force and removes metal in the process. There are also some being rubbed by the swingarm itself almost like the linkage is bending and coming into contact with it.
For the average guy in the street it's impossible do know for sure why it happens but several have found the twisting that seems to be going on distorts the bearings in the dogbone so they wear very quickly or the distortion diverts the dogbone to one side or other.
That said i have the high wear but my bearings are fine so i don't honestly know exactly what is going on.
What i ask myself is what changed from pre 04 to post 04. The linkage/dogbone area works in the same way and the earlier models still have the metal to metal contact but they don't wear in the same way. It always comes back to the link plates. My instinct is they contstantly flex and come into contact with other parts and on very rare occasions flex enough to snap. I don't have anything to back it up really but having trawled my link plates round engineers trying to get some Ti versions made almost without fail they laughed at the original and said "is that off your pushbike" If they don't trust it from an engineers viewpoint then that worried me.
It needs some kind of wear acceleration test that manufacturers use where they simulate 10k in 2 days on a vibration machine or something whilst watching slow motion footage to see what is happening. Hopefully that is what Aprilia are currently doing.
They have some of the failed links and many pics of high wear items now in their posession to use as a guide to what is occuring.
a case of wait and see i think.
It has been mentioned before that some consider less than 1% acceptable as a failure rate so maybe they will do nothing at all.