Valve Spring; Valve And Valve Spring Reassembly - Suzuki DR350 Service Manual

3-1 1 ENGINE
VALVE SPRING
Check the springs for strength by measu ring their f ree
lengths and also the force required to compress them . If the
limit indicated below is exceeded by the free length read·
ing or if the measured force does not fall within the range
specified, replace both the inner and outer springs as a set.
Valve s pring fre e length
Service limit
INNER : 35 .0 mm 11 .38 in)
OUTER : 37 .8 mm 11 .49 in)
Valve spring tension
Sta nda rd
INNER : 6 .3 - 6 .5 kg/28.0 mm 111 .7 - 14.3Ibsl l .10 in)
OUTER : 13.1 - 15.1 kg/31 .5 mm 128 .9 - 33 .3 Ibsl l .24 in)
VALVE AND VALVE SPRING REASSEMBLY
• Insert the valves, with their stems coated with (SUZUKI
MOLY PASTE) all around and along the full stem length
withou t any break .
Similarly oil the lip of the stem seal.
99000-25140 : SUZUKI MOLY PASTE
CAUTION :
Whe n inserting eac h valv e. t a ke care not to d a m age th e lip
of th e stem seal.
• Install the valve springs. making sure that the close-pitch
end
<D
of each spring goes in fjrst to rest on the head.
The
coil pitch of both inner and outer springs vary: the
pitch decreases f rom top to bottom. as shewn in t he il-
lustration.
• Fit a valve spring retainer, compress the springs with a
valve spring compressor and fit the cotter halves to the
stem end .
09916 -14510 : Valve spring compressor
09916 -14910 : Attachment
09916-84510 : Tweezers
I
5.3 - 6.5 kg
(],
28.0
mm