Engine Running Issue - Husqvarna 545 Mark II Workshop Manual

9.8 Engine running issue

Clean the engine (cylinder fins, fly wheel area etc) before start of troubleshooting.
Confirm that the fuel is of correct quality and not to old. Purge the fuel system 10 times.
Run Auto Test, check for error codes. Error code might give a hint of the problem
If product has an decompression valve,
check that the deco valve deactivate correct.
Yes
Check if the system deliveries a spark
Yes
Confirm fuel system.
-Wet spark plug?
-Purge bulb function ok ?
Yes
Leakage test of engine
Use leakage spray to check:
1. Cylinder gasket
2. Intake system
3. Cylinder
4. Crankcase gaskets
5. Crankcase
Perform a visual inspection of interface between
carburettor and intake rubber for leakage.
72 - Troubleshooting
Connect to CST.
Starting issue
Change decompression
No
valve
Does the
No
engine
start ?
1 Check the spark plug and replace if necessary.
2 Perform the "Spark Plug Test". (see "Spark Plug Test" instr.)
3. Confirm stop switch functionality.
4. Measure the distance between flywheel and ignition
No
module.
5. Perform the "Ignition System Diagnostic". (see "Ignition
System Diagnostic" instr.)
Does the
No
engine
start ?
1. Check fuel filter.
2. Check fuel houses for leakage by pressure test.
3. Check if impulse hose is blocked or leaks.
No
4. Check carburettor for leakage by pressure test. (see
separate instr.)
5. Check fuel filter in the carburettor.
Does the
No
engine
start ?
Does the
engine
start ?
Yes
Yes
Yes
Yes
Issue still remains?
Contact your Husqvarna
Local Sales Company for
No
Yes
Troubleshooting
ended
advice.
722 - 003 - 26.03.2019