I have a 2012 Diamondback Outlook, used to be my college bike, now its a spare for friends that want to ride with me. The fork is a Suntour XC 50mm. The fork sticks throughout its travel and just isn't as smooth as it was when new. I can't find any information on it as it is basically just a street bike fork. I sprayed the stanchions down with white lithium grease, it helped a little but its still pretty rough. Does anyone have any tips on how to smooth up the travel?