luke scott
Registered user
I had similar a few months ago on my 2002 Adventure (29,000 miles). It turned out to be a loose screw in behind the hand protector (handguard) that was stopping the lever returning to the fully open position. It's not easily visible and it may be worth your while removing the handguard to check it. My saviour was Mark in Platinum Motorcycles who tightened the screw and didn't charge me for looking at the bike.