Yamaha DT200L 1984-1988 Service Manual page 70

ENG
INSPECTION AND REPAIR
Power Valve
1. Remove:
• Carbon deposits
From exhaust port surface.
2. Remove:
• Score marks and lacquer deposits
From curved surface (especially cleaning
groove (D).
3. Inspect:
• 0-ring
• Bush
• Oil seal
Wear/Damage-^ Replace.
\
Piston
1. Remove:
• Carbon deposits
From the piston crown and ring grooves.
0
....... ^
-;®
>•"' ^
2. Remove:
• Score markes and lacquer deposits
From the sides of piston
Use a 600-800 grit wet sandpaper.
NOTE:
Sand in a crisscross pattern. Do not sand
excessively.
3. Inspect:
• Piston wall
Wear/Scratches/ Damage-^ Replace.
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