The 139QMB scooter engine is a popular small engine used in many scooters and mopeds. In this detailed video, we break down ...

I have either a piston slap or a gudgeon pin noise in my 1970 Ford Escort with the Kent 1.3-liter engine. I use 20/50 multigrade engine oil. I appreciate any advice you may have. Sajeev answers: In my ...