The saw starts O.K. and runs so fast that the clutch stays engaged. The engine runs irregular and the machine vibrates. When I adjust the L for the low RPM the engine stops at a higher than Idle speed. I am not succesfull in bringing down the idle speed as the engine stops.
Start by checking all ur fuel lines for holes then proceed to clean or rebuild ur carb the ethonal in fuel is cloging small engine carb jets and making needles stick so then adjust ur carb back to factory settings try with new air filter as well and run 89octane or higher in your two stroke motors u will c a great differance in performance
SOURCE: My 455 Rancher Husqvarna 20 inch chainsaw wont
Carb adjustmwnt requires a special tool and a tacho, the saw is set from the factory for the best emmisions, however it may need a small adjustment, this should be done by a qualified dealer, incorrect adjustments can damage the engine.
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Carburator is looks clean as the engine is hardly used. I took out the spark plug. It looks like it only sparks at a higher RPM. Do I need to change the coil or to udjust the air gap?
By the way the Octane is 95
I checked the ignition gap. The gap is 0.5 mm which seems to be normal to me. I would like to know for sure if the coil is faulty. Does anyone know the resitance of the coil? A new one is not particular cheap.
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