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I have the same bike in the same color with the same problem. The bike sat for about 4 years will in Iraq and getting blown up. Now trying to get the bike running. Tank was cleaned and re-enameled, carbs cleaned but still won't start. When you put gas in the carbs the bike starts and runs for a few minutes but dies. I have changed the spark plugs and checked the furl pump. Fuel is getting to the carbs but not starting the bike.
Check compression ratio and valves clearance.The carbs leak any fuel from their o-rings.Spray through the air box with a carb cleaner spray while pressing start button but little bit at a time.Don't twist the throttle too much and always use choke until she fires up for good.
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Fuel does "go off" but it won't happen in just 4 weeks. But, the battery will lose some of its charge in that time. Charge the battery and try again. Good luck.
sitting is the worst thing for a bike. you have a bad battery. if you have to leave the bike for a long time, put it on a battery tender or at least start it up once a week. the gas will go bad in the fuel system and the battery will fail. also, when you get a battery, make sure to get a good one from the dealer, dont get the cheap ones from walmart or autozone. a factory battery will last 2-5 years. you will be lucky to get 1 year from a cheap battery.
Mine was stored for 20 years, I ended up replacing the seat and needles, cleaning them thoroughly and when I tried starting it, nothing!! No gas was going to the carbs, it turned out to be my gas pump, it was seized by the old gas remains 'varnish' so I had to clean it numerous times, soaked it in gas cleaner (short period at a time 15 minutes or so, being a very powerful cleaner, you cannot leave it for long without causing greater problems, thus I was able to get the pump going by boosting it with my car batterie, having more cranking amps directly to the pump, the pump was able to release itself from the old crusty varnish.
First, what color is the fouling on the plug? Obviously the plug will need to be changed. It almost sounds like there is something mixed in with the gas causing the plug to build up. IUf the bike has been sitting for a long time with the same gas in it - have the gas tank emptied(it needs to be taken off the bike and flushed out) and have the carburetor cleaned too.
Start by removing and cleaning the carb, it may not need any parts. also change the oil, fit new air filter, new spark plug, and check the valve clearances
Check the kill switch rock it back and forth to be sure it is making contact. Open it up and spray it with contact cleaner that is safe for plastics available at radio shack. After sitting for four years I would start with the fuel system. New filter and NEW GAS and check the fuel lines for cracks and leaks. I have seen bikes that sat for 6 months and needing the carburetors cleaned and reset.
You have probably just blown the neutral light bulb, try starting the bike with the clutch in & side-stand up. If still not starting suspect the starter cut-out relay, but its still worth check both clutch & side-stand switches for continuity If you need more help I will need more information. I am available on 'Live Chat' at
the moment
Ride safe
Bike-Doc
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