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Replacement of the L-needle
1. Take off the cap from the L-needle using e.g. a pair of cutting pliers and unscrew the needle.
2. Screw the new L-needle clockwise to closed position and then turn it counterclockwise "D" turns.
Model
136/141
D = 1 1/2
55
D = 1 1/4
340/345/350/353
D = 1 1/2
346 XP
D = 1 1/2
357 XP
D = 1 1/2
* For the model 3120XP there is no cap on the L-needle, adjustment according to 3 - 9 should
therefore not be done.
3. Press a new L-cap on the L-needle to the first stop, which means that the cap is not fixed to the
needle, it should rotate independently.
4. Adjust the L-cap to the richest position (turned counterclockwise to stop) without turning the
needle.
5. Let the engine run at ~ "E" app.1 minute until warm and then let it run on idle.
Model
136/141
E = 13 200
55
E = 12 000
340/345/350/353
E = 12 700
346 XP
E = 13 000
357 XP
E = 13 500
6. Adjust the idle speed with the idle speed screw (T) to "F" rpm.
Model
136/141
F = 3 000
55
F = 2 600
340/345/350/353
F = 2 700
346 XP
F = 2 700
357 XP
F = 2 700
7. Adjust the L- needle until the highest possible idling speed is achieved and then turn the L-
needle 1/2 turn counterclockwise. Use a narrow blade screwdriver w. ith ref.no. 531 00 48-63
and insert through the hole in the cap (max. blade width 2 mm/0.08 inch). NOTE! If the chain
rotates, turn the idling speed screw (T) counterclockwise until the chain stops.
8. Check that the L-cap is still adjusted to its richest position. (Turned counter- clockwise to stop).
NOTE! The L-needle must not rotate!
9. Gently knock the L-cap into position. Use a 5 mm/0.2 inch mandrel (for ex. the locking pin for the
bevel gear ref.no. 502 02 61-03). This is a basic carburettor adjustment. Further fine
adjustments, within the limits the caps allow, may be necessary to achieve optimum
performance. See the Operator's manual.
SERVICE
Model
359
D = 1 1/2
395 XP
D = 1 1/2
3120 XP
D = 1 (non adjustable fixed jet)
336/339 XP
D = 1 1/4
334 T/338 XPT
D = 1 1/4
Model
359
E = 12 500
395 XP
E = 12 000
3120 XP
E = (non adjustable fixed jet)
336/339 XP
E = 12 500
334 T/338 XPT
E = 12 500
Model
359
F = 2 700
395 XP
F = 2 500
3120 XP
F = (non adjustable fixed jet)
336/339 XP
F = 2 800
334 T/338 XPT
F = 2 800
4
B0400066
English 4 (4)
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