You will have to ground the spark plug which isn't easy with all the plastic on today's chainsaws. I'm assuming you have a good spark though. I imagine what you will find is the typical set to run as lean as possible until it's out of warranty small engine. They do this to pass emissions tests. The carbs aren't adjustable as they come from the factory, some you can pull the plastic stops off the mixture screw and get a little more fuel to them some don't have the adjustment screws anymore. You can buy a new carb cheap on e-bay. cheaper than buying a kit and trying to fix one. With a little luck it will have both low and high speed mixture screws and you can get the chainsaw running better than new. And the fuel lines turn to gum especially with gasohol, and it goes on and on...... If you do get a replacement carb be sure to get the right one for your model engine Unless you like messing with small engines it might be best to find someone that works on them to get it usable. They should know all the tricks. Ask around and find someone that fixes small engines part time or for a hobby otherwise it won't be cost effective.