Suzuki DR350 Service Manual page 52

ENGINE
3·21
VALVE S P R I N G
Check t h e springs f o r strength b y measuri n g their free
lengths and a l so the force required to compress them . If the
li mit ind icated below is exceeded by the free l en gth read­
ing or if the measured force d oes not fall withi n the ra nge
specified , replace both the in ner a n d outer springs as a set.
Valve spring free length
Service Limit
INNER : 3 5 . 0 m m ( 1 .38 i n )
OUTER : 3 7 . 8 mm ( 1 .49 i n )
Valve spring tension
Standard
INNER : 5 . 3 - 6 . 5 kg/28 .0 mm ( 1 1 . 7 - 1 4. 3 Ibs/1 . 1 0 i n )
OUTER : 1 3 . 1 - 1 5 . 1 kg/3 1 . 5 mm ( 28 . 9 - 33.3 Ibs/ 1 . 24 in)
•
VA LVE AND VALVE S PRI N G REAS S E M BLY
I nsert the valves , with their stems coated with ( S U Z U K I
M O LY PASTE) a l l a round and a l o n g the full stem length
without any break.
Similarly oil the lip of the stem sea l .
99000-25 1 40 : SUZUKI MOLY PASTE
CAUTION :
When inserting each valve, take care not to damage the lip •
of the stem seal.
Instal l the valve springs, making sure that the close-pitch
end CD of each spring goes in first to rest on the hea d .
The coil pitch of both inner a n d outer springs vary: the
pitch d ecreases from top to bottom , as shewn i n the il­
l u stratio n .
•
Fit a valve spring retainer, compress t h e springs with a
va lve spring compressor a n d fit the cotter halves to the
stem end .
099 1 6- 1 45 1 0 : Valve spring compressor
099 1 6- 1 49 1 0 : Attachment
0991 6-845 1 0 : Tweezers
5 . 3 - 6 . 5 kg
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Towards
Head
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