Wont start - Makita DCS6401 20 20",64cc Chainsaw 2 Cycle

You need spark, fuel, and compression, which one is missing? Spark is easiest.
Ignition Coil Test by SmallEng.com
http://www.youtube.com/watch?v=L7WNBDRG4C4
You may need to use a jumper wire between the threaded part of the plug and the cooling fins. You don’t have to bend up the electrode.

If spark is good put a small amount of fuel mix into carburetor throat. Does it attempt to start if yes, check the fuel filter on the free end of a hose in fuel tank (manufacturer recommends an annual replacement). Check all fuel delivery lines especially at fittings and bends for cracks and holes. If those are good then the likely cause is internal parts of the carburetor are dirty or have failed.

Got spark, getting fuel but not flooded is beyond the our scope of help. I suggest a local chainsaw seller/mechanic for an estimate to repair. Your saw is made by Dolmar (Germany). I use a local Stihl dealer when my Husky problem is beyond something I want to repair. HTH
Lou