![background image](/i/yamaha/162252/yamaha-vmx12h-1995/h/yamaha-vmx12h-1995-149.png)
INSPECTION AND REPAIR
10.
Apply:
.Solvent
Into
each intake and exhaust port.
Pour solvent into intake and exhaust ports only
after completion of all valve work and assembly
of
all head parts.
11.
Check:
.valve seals
Leakage past valve seat
Replace valve.
(See procedure below)
Valve guide
Relapping steps:
head parts.
Repeat lapping steps using fine lapping com-
all parts thoroughly.
and check for leakage again
steps as often as necessary to effect
pound.
using solvent.
a satisfactory seal.
Valve Spring
This engine uses two springs of different sizes
to
prevent valve float or surging. Valve spring
specifications show t h e basic value character-
istics.
Outer spring
spring
1.
Measure:
free length
O u t of specification
Replace.
Minimum Free Length:
Outer:
38.90
mrn (1.531 in)
Inner: 37.45 mm (1.474 in)
3-25