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42 MS 290, MS 310, MS 390

– Remove the fan housing with

rewind starter, b 8.2

– Use locking strip to block the

piston 0000 893 5903, b 5.5

: Unscrew the flywheel nut (1).

209RA121

: If the flywheel cannot be removed

by hand, screw the puller (1)

1116 893 0800 onto the

crankshaft stub.

209RA122

– Use a suitable tool to tap the end

of the puller to release the

flywheel.

– Unscrew the puller.

: Remove the flywheel (1).

209RA123

: The flywheel (1) and magnet

poles (2) must not be damaged

or have turned blue. Replace

flywheel if necessary.

209RA125

– Degrease crankshaft stub and

bore in flywheel with standard

solvent-based degreasant

containing no chlorinated or

halogenated hydrocarbons,

b 13.

Install in the reverse sequence.

: Make sure the machined key

(arrow) engages the slot in the

crankshaft.

– Check air gap between ignition

module and flywheel and adjust if

necessary, b 7.1.2

209RA124

Install all other parts in the reverse

sequence.

7.3 Flywheel

Stihl MS 390 User Manual

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