CF MOTO CF500-5B 2009, Service Manual, Page: 117 / 272

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Valve Stem Run-out
" Support valve stem with V block as illustrated on
the right. Check the run-out with a dial gauge.
Service Limit: 0.05mm
Tool: Magnetism Stand
Dial Gauge (1/100)
V block
Valve Head Radial Run-out
"
M ea s u r e t h e v a l v e h ea d r a d i a l r un -
ou t a s i l l u s tr a t e d on t h e ri gh t.
Valve head Radial Run-out out of range:--Replace
Service Limit: 0.03mm
Tool: Dial Gauge (1/100)
Magnetism Stand
V Block
Valve Face Wear
" Check each valve face for wear or damage.
Replace valve with a new one if it is found to have
abnormal wear. Measure valve head thickness T.
Valve head thickness T out of range:
---
Replace
Service Limit: 0.5mm
Too l : V e r n i e r C a l i p e r
Valve Stem O.D
"
Measure valve stem O.D with a micrometer
Service Limit:
IN: 4.975-4.990mm
EX: 4.955-4.970mm
Tool: Micrometer (0-25mm)
Valve Stem End
" Check valve stem end for pitting or wear. In case of
any pitting or wear, resurface the valve stem end. If
the length T is less than service limit, replace valve
with a new one.
Valve Stem End Length
Service Limit: 2.1mm
Tool: Vernier Caliper