Are you sure? I thought it only lasted until the bikes warrany expiry date.
If the repair had been done under the original two year warranty say at 22 months then any repair would only be warranted for the remainder of the manufacturers warranty i.e. 2 months
What we have here is a manufacturers goodwill contribution in which the manufacturer is only paying a percentage of the total claim. If the manufacturer carried out and payed for the work 100% then the warranty remains with the manufacturer. If as in this case the owner is making a financial contribution towards the work (however small) then the warranty remains with the owner and any subsequent failure would be covered under the manufacturers parts warranty. Check out how long the warranty is on BMW spare parts. With some manufacturers the spare parts warranty is longer than the vehicle warranty.
It really can pay to make a financial contribution towards any goodwill claim

Headed over to Scotland on it for 4 days last week and all was well. Only downside was having to run it in again but having covered 1200 km on the trip that is now sorted.