S E R V I C E
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97-04-10
English Page 1/4
Model 225H60/H75
Basic adjustment of carburettor 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
regulations. 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 carburetor
1. Check that the 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
independently. Do not adjust the L needle as this is set at the factory and the locking
cap is already fitted.
2. Start the engine. If necessary, adjust the idle speed with the T-screw.
3. 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 adjust the H
needle to give maximum revs, then turn it counterclockwise so that the engine speed
drops by 500 rpm.
4. Run the engine warm at full throttle for 2-3 minutes.
5. Check the idle speed and acceleration.
6. Adjust the H needle to give maximum revs, then turn it counterclockwise so that the
engine speed drops by 500 rpm.
7. Check that the locking cap is still adjusted to its richest setting. (Turned
counterclockwise to stop).
8. Gently knock the locking cap into position. Use a 5 mm (0.2 inch) mandrel.
This is a basic carburettor adjustment. Further fine adjustments, within the limits the
locking cap allows, may be necessary to achieve optimum performance. See the
Operator’s manual.
For Husqvarna Parts Call 606-678-9623 or 606-561-4983
www.mymowerparts.com
