I remember my dad telling me that EFI on cars was a joke. He said the carburetor will never be replaced.
All I know is this. I operate 7 different chainsaws from Sthils, Husqs, Dolmars and Echos. And I operate at least 1-2 of them on a daily basis for our sawmill operations here in Texas.
A TON of people who run chainsaws need to learn VERY basic rules of chainsaw care and how to maximize the life of your heads.
#1 ALWAYS CLEAN THE AIR BOX / FILTER EVERY SINGLE TANK OF GAS. Yes, it is that simple! Those little nanoparticles will absolutely destroy your top end. Another tip....research your chainsaw's air filtration system. Not all are created equal. I feel Dolmar is #1, Husq #2 and Stihl #3. I run aftermarket filter setups on my big bore Stihls for a reason.
#2 TRY TO NEVER RUN your chainsaws out of fuel. Actually, maybe this should be #1 although I have no empirical evidence to support it. Why? The air to gas mixture is significantly compromised when these motors are running out of fuel. So simply said, you create a massive lean condition that will result in premature top end failure. ESPECIALLY, if you are the guy who runs your saw until it is out of gas. BAD MOVE! I always make sure to re-fuel my saws PRIOR to actually needing gas. And guess what? I also check my air box.
Get into this regular habit and you will be amazed at how you can extend the condition of your chainsaws. I use to average 2 top end rebuilds a year. Then I made sure everyone in my business prescribed to these rules and I'm getting twice the life out of my top ends. Yes, on occasion some dumbass buries a 36+ bar into a massive Live Oak or Pecan and keeps it full throttle....