There are 3 main factors to create power in the cylinder, air, fuel and spark. If you are getting air and fuel you might just need a new plug. Most engines need to warm up before you will get peak power especially in cold weather. Make sure you have fresh fuel and are using the correct fuel to gas ratio as well. To much oil can kill performance and to little will cease your engine. Use fresh gas because as gas ages its properties change a gallon of fresh gas can be a world of difference. If you tend to hold on to a batch of gas for a while add a fuel stabilizer that is safe for 2 cycles. If you stored the saw with untreated gas film may be built up in the carburetor some carburetor cleaner and that fresh fuel should do it. Lastly if you store your saw for long periods of time first fill it up with the stabilized gas/oil mix, and then run it to get that stabilizer in the carburetor. It should start right up the next time you go to use it.
Rugger5, January 2011
