Husqvarna 225 Service

Model 225, 232, 235
Basic adjustment of carburetor for E-TECH engines.
To attain the lowest possible amount of harmful emissions from the engine you have to
adjust the carburettor according to the following instructions.
This instruction is basically designed for the U.S market to meet the CARB and EPA regu-
lations. Therefore the engine must be set under load when adjusting the H and L adjusting
screws.
Furthermore the H and L screws are furnished with locking caps to prevent the end user
from modifying the adjustment. The locking caps can be lifted off from the screws to ac-
cess a wider setting range.
A plastic sleeve is fitted over the locking caps to lock them in the richest setting (counter-
clockwise against the stop) while the needles are adjusted. When the adjustment has been
made and the locking caps have been knocked onto the needles the plastic sleeve no
longer serves a purpose. It is only an aid during adjustment.
After replacement of complete carburettor
1. Check that H needle's locking cap is adjusted to its richest setting. (Turned counter-
clockwise to stop.) The locking cap is not fixed to the needle, but can be rotated inde-
pendently. Do not adjust the L needle as this is set at the factory and the locking cap is
already fitted.
2. Fit 4 trimmer cords, diameter 3.3 mm (0.13 inch) on a Trimmy Fix. (Trimmy Fix M10,
531 00 38-69, for 225 and 232. Trimmy Fix M12, 502 13 87-02, for 235.) It may be
necessary to drill out the holes in the Trimmy Fix to make it easier to fit the trimmer
cords.
3. Cut the trimmer cords to correct length (measured from the outer edge of the Trimmy
Fix):
225: 145 mm (5.7 inches)
232: 155 mm (6.1 inches)
235: 170 mm (6.7 inches)
Fit the Trimmy Fix on the machine. Note! For 235 the splash guard must be removed.
Bear in mind the trimmer cords.
4. Start the engine. If necessary, adjust the idle speed with the T-screw.
5. Apply full throttle. Use a narrow blade screwdriver, inserted through the hole in the
locking cap until it reaches the slot in the needle, (max. blade width 2 mm, 0,08 inch) to
turn the H-needle counterclockwise until the engine clearly 4-cycles. Turn the H-needle
back clockwise until the 4-cycling stops and a top speed of 8400 + -200 rpm is
achieved.
Note that the revolution 8400 +- 200 shall be achieved as close to the 4-cycle limit as
possible.
S E R V I C E
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97-04-10
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