SV200 R200
4/2007© by GLOBAL GARDEN PRODUCTS
NOTE - The valve seats must be ground by
hand, using a special grinding tool with an angle
of 45°.
45 Insert the pin (34) in the cylinder head valve
guide and then the grinding tool (35).
NOTE - Grinding must be done taking care to
remove as little material as possible.
46 Use a caliper gauge to check the depth of the
valve seat (C), which must be between 0.8 and
1.5 mm inclusive; the cylinder head must be
replaced if a greater value is measured.
47 Apply abrasive paste for grinding around the rim
of the valve head (33) and then insert the valve
into its seat.
48 Use the special manually operated tool (36) to
grind the seat and rim of the valve.
49 Remove the valve and use clean petrol to care-
fully clean all traces of paste or metal residues
from the valve seat and rim.
50 Check the free length of the spring (37) and
replace the spring of it is less than 32,5 mm.
51 When mounting:
– carefully clean the valve guides and housings
of any foreign body;
6.9.1
ENGINE BLOCK – External operations
4 / 7
SERVICE MANUAL
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