CLEANING THE VALVE GUIDE:
• Remove the valve and valve springs
• Use a valve guide reamer to clean up the carbon accumulation.
Note: only turn right when using the reamer and do not push in or out
directly with the reamer.
MEASURING THE VALVE GUIDE INNER DIAMETER:
Service limit 5.03 mm 0.198 in.
• Calculate the clearance between the valve stem and the valve guide.
(The inner diameter of the valve stem minus the outer diameter.)
Service limit Inlet valve Exhaust valve
• If the abrasion of the valve guide exceeds the service limit, it should be replaced.
• After installing a new valve guide, the valve seat must be reconditioned.
• Heat the cylinder head to 212°F ~ 302°F. (100°C ~ 150°C)
Note: The cylinder head must be heated quickly and in its entirety. Warping may occur if it is heated partly or
not quickly enough. However, do take care around the high level of heat.
• Tap the valve guide out with a valve guide remover or similar tool. Do not damage the cylinder joint face.
• After tapping the valve guide in, ream to size.
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