Yamaha RD250 Owner's Manual page 118

20. A i r f i l t e r
T h e air filter e l e m e n t s h o u l d b e r e m o v e d a n d c l e a n e d
at least o n c e a m o n t h , m o r e o f t e n if t h e m o t o r c y c l e is
r i d d e n m a i n l y in t h e dirt (preferably e a c h t i m e after
y o u s p e n d a n entire d a y in t h e dirt).
a. O p e n t h e s e a t a n d r e m o v e t h e r u b b e r b a n d h o l -
d i n g the air filter c a s e c a p .
b. R e m o v e t h e c a s e c a p .
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