sideplay in rocker arms

[Michele Varcasia]

Mark,
which is the max sideplay in the rocker arms in the r50 ?
Michele

[Allan Atherton]

I would venture that there should be no sideplay. A little side play may do no harm, but can cause mechanical noise and sound like loose valves. The rocker should be pinched by its two head bolts so no side play can be seen or felt. The pinching can be done by tapping one of the rocker mounts on the side, before the bolt is tightened. But the rocker should not be pinched so tightly that it cannot be rotated freely by your fingers. Do this rotating when the piston is not at top and some movement is possible, otherwise the rocker will be on top of the valve.