Ya a bike blessing.
Everyone rides their bike into a field at a shrine , The priests say a little mass and then everyone lines up to have water thrown on their bike. There has to be something to it. I lost my clutch waiting to be blessed then it oddly healed itself afterwards and hasn't given me a problem since!
Here's an outdated link
http://www.allroutes.to/1999blessingofthebikes/1/