volgens cms is die het zelfde als 4bak model, en in zb2 partslist roepen ze het zelfde, maar nou zie ik toch echt langere ribben!
CB-viguur schreef:valves of the 4speed and 5speed models differ, but can be swapped without problems.
As allready said, the head is from an other casting mold, with bigger ports, more fins and a bigger airscoop to get air over the combustion chamber.
There are 5speed heads with extra tall fins next to the exhaust-valve-cover, what means you can't put other covers on there that have a bigger diameter.
This is my engine with such a head
There are allso different ports between the 5speed heads, might depend on year of build.
