What to do when your McCulloch chainsaw engine runs rough (For an accurate compression reading, use a compression gauge.) If you don't feel air pushing from the cylinder, it's likely that the piston rings need to be replaced. Finally, to check for compression, remove the spark plug, press your thumb over the opening and pull the starter cord.If you see deposits or corrosion on the electrodes, replace the spark plug. Next, disconnect the spark plug wire and remove the spark plug.If the fuel lines are okay, you may need to rebuild or replace the carburetor because a dirty carburetor won't supply the engine with fuel. Air enters the carburetor instead of fuel when the fuel lines have cracks. If the fuel is fresh, check for and replace cracked fuel lines.Add fuel stabilizer to the gas when you refill the tank to help keep the fuel fresh. First, make sure there's fresh gas in the tank-old gas accumulates water and burns poorly.Use the following steps to figure out what's wrong and then order the McCulloch chainsaw repair parts you need to fix the problem. The chainsaw engine needs gas, compression and spark in order to start. How to fix your McCulloch chainsaw when it won't start

Mcculloch mac 3200 parts diagram