Rocker arm or also known as cam follower is a piece of metal that follows the cam (SOHC or DOHC) to transfer the lift and close instruction from the cam bump to the valve. Conventional rocker arm does not have a roller. See picture below. So, what is the advantage of the roller rocker arm?
Category: ego modification
KOSO Indonesia has released DOHC head for Yamaha Mio a.k.a Ego in Malaysia for Indonesian customers. Not just DOHC is installed but the head also give 4 valve to work with it. Combined with big bore block, the Mio is no longer cute automatic bike, but formidable machine. 2 more pictures after the jump