ALWAYS ALWAYS ALWAYS!! You absolutely must use air filter oil, and some waterproof grease on the rim for a good seal. Any tiny amount of dirt or sand that gets past the filter will mess up your engine! Check the filter after every ride, and if it's not clean or if it's black or anywhere close to black, clean it with air filter cleaner and some warm water with soap, and then more water.
4 months, 2 weeks ago