Carburettor Adjustment - Jonsered CS 2240 Workshop Manual

Carburettor adjustment

Conditions during adjustment
• The air filter should be clean and the cylinder
cover fitted when adjustments are made. Ad-
justing the carburettor with a dirty air filter will
give a too lean fuel mixture the next time the
air filter is cleaned. This can result in serious
damage to the engine.
• Mount, for this model, approved bar and
chain combination (see Technical data in the
Operator's Manual).
CS 2240/S 16"
• The chain should not be tensioned more than
that it remains ~ 0,2 inches to the bar.
(See figure 43)
Replacement of the H-needle or complete car-
burettor
1. Carefully screw the new H-needle to the bot-
tom and turn it anticlockwise "A" turns.
CS 2240/S A = 2
2. Start the engine. If necessary, adjust the idling
speed with the T-screw until the chain stops.
3. Adjust the H-needle to give a top speed of "B"
rpm. Use a tachometer.
CS 2240/S B = 12500-13 000, speed limitation
Use screwdriver 530 03 55-60.
4. Let the engine run at "B" rpm ~ 1 minute, until
warm.
Replacement of the L-needle
1. Screw the new L-needle to the bottom and
then turn it counterclockwise "D" turns.
CS 2240/S D = 2,5
(See figure 44)
Fig 43
L
Fig 44
Repair instructions
H
T
41
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