Fuel stablizers are not the right option simply take off your air filter tie the safety back so you can crank the mower as its running mist wd 40 into carb lightly you will hear the mower start to choke out stop the spray then start again after you have ran wed 40 through the grab then drain the tank restart the mower and lightly mist wed 40 until it runs out of gas I use to run a rental go kart track in Michigan some stableizers gel up in extreme cold that means a carb and tank cleaning by using wed 40 it coats and preserves make sure you drain the gas and eat it run completely out then I promise you simply fill with fresh gas and pull the cord I had 25 rentals our winters are 5 months long make sure you reconnect the fuel line just saying thanks this works for all gas powered mowers
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When gasoline sits for an extended period of time the "varnish" builds up inside the carburetor and can keep your engine from running. If you suspect that this has happened, the only good solution is to first replace the carburetor, and then ALWAYS use a Fuel Stabilizer every time you buy gas for your lawn mower.
Also, at the end of a season, it is always a good idea to run the engine until it is dry and out of gas before storing the lawn mower over the winter. A fuel stabilizer should keep your gas fresh over the winter, and the lawn mower will start up quickly in the spring. If you are the cautious type, always buy fresh gas at the beginning of every season, and NEVER forget the fuel stabilizer no matter what. Gas starts turning bad after just 30 days....
I bought my B&D cordless mower CMM1000 (very similar to the CMM1200) in April 2003. I made the mistake of following their instructions and stored it inside unplugged the first winter. Never again! The battery would not hold a charge April 2004, but was covered under warranty. Since then, I've left it trickle charging in the shed year round, including cold winters. No problem since then with the battery, which will last about 5 yrs before you need to replace it.
First check for spark. Remove the spark plug. Leave the spark wire connected. Hold the plug against the metal of the mower engine so you have a ground and can see the gap of the electrode where the spark jumps across. Have someone pull the starter cord and verify that you have a spark. Hold it by the threads of the plug so you don't get a little spark jolt yourself.
go to an auto parts store and get a can of starter spray (it's actually ether), Remove the lawnmower spark plug and spray a little ether in the plug hole. Put the plug back and tighten it and see if it starts. It will probably start, run for 5 or 10 seconds and then die. Repeat this procedure once or twice again and eventually it will start to draw gas from the lawnmower tank.
A seasonal tip. when you put the mower up for the winter, **** the remaining gas out of the tank, start the engine and let it run until it uses up the gas in the carburetor. This will make iot much easier to start in the spring
Hope this helps Good Luck Loringh PS Please give me a rating