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When you drained the gas from the gas tank did you also take the carb apart and clean it. There should be a bowl that the fuel line from the gas tank goes to. There is a float in that bowl that has to go up and down to regulate how much gas goes into the engine. You may have a build up of varnish from old gas on the piece that the float moves up and down. Also there should be an idle jet that you screw in and out to adjust the idle. That also could be junked up.
Most often this is because the gas has "soured" - it breaks down into a varnish compound, which is easily recognized by a foul smell in the gas tank that does not smell like gas.
You need to drain all the old gas. Pull the spark plug (clean it also- using a new plug is even better!), pump the primer bulb, and then pull the cord twenty times or so with no plug in the engine to try and purge all the old fuel. Get as much as possible out of the fuel system- the primer bulb should only have a drop or two at most in it.
Next, put in fresh gas along with a little carb cleaner- mix a gallon of gas with half an ounce of carb cleaner, plus whatever amount of two stroke oil you normally mix per gallon. Put the plug back in. Press the primer bulb 3 times, set the choke, and try to start. Make sure that you can see fuel in the primer bulb.
Your chainsaw will probably fire on the first or second pull, but not run (if it does start and run, GREAT!) On the third pull, most often it will start....if not....
Pump the primer three more times, and try the starting procedure again, and hopefully it will start, possibly running rough for the first minute.
If you still cannot get it started, pull the plug, clean and dry it, and try again... it is best at this point if you have a brand new plug to use it instead.
If your saw will still not start and run steady, you probably have a "varnished carb" - buildup from the gas souring has clogged the needle valve/orifice, and the float may be stuck. You will need to service the carb.
its probably your fuel filter... When a motor sits with fuel for a while it will begin to varnish which will clog the fuel filter and sometimes cause the float or jets to stick or get clogged. But if it works with the fuel line detached I can almost promise its a fuel filter issue. If that doesnt clear it up check the petcock valve at the tank.
Try a small shot (about a 2 second spray) of starting fluid in the air intake then cranking....
WARNING- DO NOT TRY AND KEEP IT RUNNING BY USING THE STARTING FLUID! It can damage your engine.
If your bike fires and runs for a bit, the most likely problem is your gas has gone "sour". You need to drain all the old gas out and properly dispose of it.
Over time, gas will cause a varnish buildup in your carb if it sits too long. You can try adding some carb cleaner to fresh gas, but the results will not be immediate. You may have to have the carb rebuilt.
When you store anything gas powered, there is an additive called Sta-bil that will act as a gasoline preservative for about a year.
If it sat for 3 years the fuel may be in pretty tough shape. If he gasoline smells like a can of old varnish or turpentine then it may have gummed up either the fuel pump, injectors or both. I would start by testing the fuel pressure with a gauge first to see if it is actually pumping enough fuel to run the engine. If the fuel smells bad or your pump isn't working you may need to have the fuel tank removed and cleaned and the fuel lines flushed to get all the old gunky fuel out of them. Also check to be sure you actually have spark at the plugs so you'll know if the ignition system is still working.
The most likely problem, especially with the bike sitting up during summer, would be gas has gone stale. If the bike sits long enough, the gas will actually turn into a varnish.
Drain the tank, refill with fresh gas, and let it run a while.
Basically, you have to run out whatever gas is between the tank and the cylinders, so the fresh gas can get to the cylinders.
I'd put a box fan blowing on the front of the bike to help keep the ehat down. Blip the throttle after a few inutes. Depending onhow much old gas is 'stored' in the fuel lines and such, it may take 10 or 20 minutes to burn out the old gas. Keep blipping every few minutes, and let it cool down after 20 minutes. Some bikes have short fuel path and clear in 2 minutes at idle, I've seen custom setups that took over an hour.
Remove the carb , dissemble it and clean the varnish out. After so long in storage I am surprised it runs at all. Remove the petcock, ( gas valve ),water trap and clean it out. Next let one cup of gas flow into a container. Any water or rust in the bottom of the container? If any rust was in the water trap or the container then purchase an inline fuel filter to eliminate the rust getting into the carb.
If cleaning the carb yourself does not do the trick then take it to the dealer and have them clean it and install a carb kit. This should get you back on the road.
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code 43, i would expect with running rough but that's not the cause , its a result ,if the system detects noise (knock) it will try to compensate by retarding the timing to save the motor , built in self preservation , i hope your not running on 2 year old gas , i'd be amazed its even running at all , gas varnishes up bad enough in 6 months to 1 year , i suggest getting some fuel additive in there to stabilize and clean the fuel system , or have it drained and start over with fresh gas and go from there . cheers .
If all the above does not work, then take out the carb adjuster screw and inject some compressed air briefly. It sounds like a float is stuck, which happened often in the old Briggs&Stratton engines.
Basically, it is starting fine with a full float or full amount of gas, then that gas is running out and the unit starves out. So, you have a clogged fuel line-drain tank&blow out line-or the float mechanism is sticking. Sometimes the additives mentioned above will work, but a good blast of compressed air through the carb/fuel line has helped me many times, especially with an engine that has sat for any amount of time or that got some bad gas in it.