I said 4000 miles is a short life span for a clutch.
I then went on to explain a scenario where the rider may have a habit of holding in the lever which causes the clutch to slip whilst he / she is riding. this would accelerate the wear rate of the clutch plates.
Jedspink, did you see or were you given the clutch friction plates if not where are the original plates now?
tc330 and AmateurCynic in 40+ years of riding I have only ever replaced one clutch on any of my bikes, the reason is like you I know how to use the clutch correctly, the difference is in 'riding' the clutch and 'slipping' the clutch and there are degrees of 'slip' to consider.
tc330, big end bearings are not deemed as consumable items and an early failure would have to be inspected to determine the cause.
Manufacturer recalls are a totally different kettle of fish to warranty claims, granted that they stem from high warranty claims of a specific model / component showing a high rate of claims.
I would consider myself naive if I thought that a vehicle manufacturer was liable to replace consumables without proof of an items failure. The onus now rests with jedspinks to supply the original parts for inspection by an independent engineer.
As I read it the dealer has carried out 4 adjustments and replaced the offending worn plates and as such has carried out their obligation, the problem is with Triumph and the only way forward is if the original plates are in jedspinks possession as it will depend on the inspection of said plates by a trading standards independently appointed inspector to determine why the wear rate is so excessively high.
There will be evidential pointers as to how the clutch plates were utilised whilst in the bike and tests on the materials used would need to be carried out.
Also the bike would have to be inspected so that all other components which are used in the clutch system can be inspected for a possible link to the cause of the problem. It is this inspection which is more likely to show why the friction plates have worn quickly and it would be this component that should be submitted for a warranty claim.
Worn friction plates are the end result, not the failure, something else has acted on the plates to cause them to fail.
Jedspink old long ago did the clutch plates get replaced and has that rectified the problem?
Lastly what if any were the comments from the dealer when they adjusted the clutch?
And with no disrespect intended to jedspnk we only have his / her word that he / she used the bike in the correct and proper manner.