Chainsaw User Manual

40
English / USA
MS 290, MS 310, MS 390
If groove depth is less than specified:
: Replace the guide bar.
The drive link tangs will otherwise
scrape along the bottom of the groove –
the cutters and tie straps will not ride on
the bar rails.
The air filter system can be adapted to
suit different operating conditions by
simply installing a choice of filters.
Fabric filter*
For normal operating conditions and
winter operation.
Fleece filter (non-woven)*
For dry and very dusty work areas.
* see “Guide to Using this Manual“
Dirty air filters reduce engine power,
increase fuel consumption and make
starting more difficult.
When there is a noticeable loss of
engine power:
: Press down the throttle trigger
interlock and set Master Control
lever to “Cold Start” l.
: Turn the twist lock above the
rearhandle counterclockwise.
: Lift off the carburetor box cover to
the rear.
: Clean away loose dirt from around
filter.
Chain
type
Pitch Minimum
groove
depth
Picco 3/8“ P 0.20"
(5.0 mm)
Rapid 1/4“ 0.16"
(4.0 mm)
Rapid 3/8“; 0.325“ 0.24"
(6.0 mm)
Rapid 0.404“ 0.28"
(7.0 mm)
Air Filter System Cleaning Air Filter
139BA016 KN