SHERCO 250 SE-R 2017 Workshop Manual page 32

ENGINE COMPONENTS
- Continue to rotate the control valve clockwise,
the second guillotine must begin to return and
the boosters must begin to rise.
- Complete the rotation of the control valve, both
guillotines should be returned and both
boosters should be raised.
- If the timing is not perfect, loosen the screw.
- Rotate the control valve to the maximum
clockwise untit it stops and tighten the screw.
- Check the timing again.
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250-300 SE-R