i have a 1980 qt 50 that started making a new noise. When it accelerates it makes a sound like a whrrrr that is in sink with the acceleration. I thought it might be the gears turning with out enough oil so i added some oil and that seemed to help a little , but it still happens off and on. Maybe i should add even more oil?
also i lost the side cover on the side of the air intake of the air filter and my bike started going up to 35 miles an hour. is this related to the whrrrrring noise or is this something else and why is my bike going so fast?