Originally Posted by matsplatuk
Oh OK, i think i understand,
I leave the 1mm shim on the cam chain side but then add shims to the spark plug side so the total play/gap on the shaft is 0.2 - 0.3mm?
Is this something worth doing or will it be safe to leave it till another day?
I suppose i just go to a dealer and ask for LC4 rocker shaft shims?
Funny that this procedure isn't mentioned in the LC4 motor manual ive got.
Many Thanks Guys - Mat
Right out of the book...
NOTE: Discs bl are available 0.15 mm, 0.30 mm and 0.50 mm thick.
– Mount new O-rings bp on rocker arm shafts 1.
– Mount rocker arms 2, thrust washers 3 and rocker arm shafts 1.
– On the side of the water pump one thrust washer bn ≪ 1.0 mm (0.04
in) must be mounted.
– The axial play on the opposite side is roughly equalized with thrust
washers 3 ≪ 1.0 (0.04 in) and ≪ 0.5 mm (0.02 in).
The axial clearance of the rocker arm axles must be 0.20 - 0.30 mm.
Considering 1.0mm is over three times what KTM recommends as a maximum end play, you should probably take care of it now.
It's not just end play, but potential acceleration and deceleration of the rocker arm laterally. The more play, the greater those forces, the greater those forces the more thrust and wear they can generate.
At least that's the viewpoint I would take.