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KINROAD 150 SERVICE MANUAL
VALVE GUIDE
Carbon accumulation of the valve guide will make the valve move rough, causing the valve not to open or
close properly.
Valve guide abrasion is one of the reasons that cause the exhaust pipe fuming white smoke.
CLEAN CARBON ACCUMULATION OF THE VALVE GUIDE
Remove the valve and valve springs.
Clean the carbon accumulation with a valve guide reamer.
Turn right when using the reamer, and do not push in or
out directly with the reamer.
VALVE GUIDE INNER DIAMETER MEASUREMENT
Service limit
Calculate the clearance between the valve stem and the valve
guide.
(The inner diameter of the guide subtracts the outer diameter of the
valve stem).
Valve
Service limit
When the abrasion of the valve guide exceeds the use limit, it should be replaced; after replacing
a new valve guide, the valve retainer must be adjusted.
VALVE GUIDE REPLACEMENT
Heat the cylinder head to 100 – 150 ｏC.
The cylinder head must be wholly and quickly heated
to the specific degree, and cannot be heated partly;
otherwise it'll cause cylinder head distortion. The
temperature is very high, so two technicians are
recommended.
Tap the valve guide out with a valve guide remover or similar tool.
Do not damage the cylinder joint face.
5.03 mm
Inlet valve
0.08mm
Exhaust valve
0.10mm
26
VERSION 1, DEC., 2005
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