When these issues happen, we normally do troubleshooting. But when these persist, we may think about buying a new unit for hassle-free use. Now, before thinking about replacing your old chainsaw, why not learn about the reasons why your chainsaw is not cutting or why it produces so much smoke and shows other problems? So why don’t we figure it out first and see where the problems come from, then we’ll consider some solutions and hopefully our DIY tips will work. If they work, you can save yourself a lot of money from buying a new unit. 
Why we want to share with you our knowledge and tips about troubleshooting chainsaws is ,we have seen and gathered so many chainsaws among our trash just getting dumped and checking them out, they generally have the same issues as we have mentioned, re: smoking and not cutting and these expensive machines were dumped just for these simple issues. But with our DIY solutions, we have succeeded in getting them running again like new.