A simple procedure covered in the manual. Be sure to grease the end of the bar. But see above-can't give 10 year review on this. I haven't used my 20 saw since I got it. The first job was a trash palm tree.
Husqvarna 450E Features & Specs
X-TORQ - Delivers lower fuel consumption and reduced exhaust emission levels in accordance with the world´s most stringent environmental regulations
AIR INJECTION - Centrifugal air cleaning system removes larger dust and debris particles before reaching the air filter. This results in reduced air filter cleanings and improved engine life
SMART START - The engine and starter have been designed so the machine starts quickly with minimum effort
EAST TO START - Combined start/stop switch, Smart Start and fuel pump make the saw very easy to start
SNAP-LOCK CYLINDER COVER - Saves time when changing spark plugs and cleaning; Maximum power speed: 9000 rpm
Editor's Impressions Of The Husqvarna 450E
Cutting Power
Tool Motor Power
Chain Alignment
Value For Money
Build Quality
Feature Set
Husqvarna 450E Final Thoughts
"Fewer parts to break."
No gasoline storage issues, no smells. With that there are always compromises. The second red mark was about 14 inches. I think it too was broken or the chain was dull. Most trees we're over 3 feet in diameter.