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Sounds more like a timing problem than an O2 Sensor. Distributor out of Sync would be my guess. It ran better at Higher idles because the timing belt/chain was tight from tension at low idle the timing was off which caused your problems. Now the belt is either broken or so loose the timing is out and the vehicle won't fire. If it has a Distributor cap remove it and watch the rotor. If it turns the belt is intact but Timing may still be off.
Sounds like you are flooding the engine with gas. Put in a new spark plug then twist the throttle one time to prime the cylinder. Now get your hands off the throttle and give it a few kicks. Each time you twist the throttle the power valve gives a shot of gas. Too much can flood the engine quickly.
One, That thing should fire up in a second, if not, you got to get it so it will. Try not touching the gas, just pull on the choke, and give it a try. If that doesn't do it, try something else next time. I had a KLR 250, kick only, and that thing would start first kick every time, no matter what. I loved that little bike. Hope this helps.
I used to own an old 250 Ducati and I had a similar problem but all it turned out to be was not shutting off the gas **** whenever i shut off the engine even for a 10 min stop.After I resolved that problem the little F....r ran great.I do not know if this is of help or not but that was my resolution.It also did not cost me an arm and a leg...Just an arm to find out
If you have spark them it must be gas. eather no gas or to much gas. Put it on chock, be sure the shut off valve is in on position.Now crank it over a few times , if it wont fire. Check the plug , is it wet or dry .If its wet then it may be flooded and needs to dry out and air out the cylinder.Try starting when dry. If its dry try putting a 1/2 oz of gas into the spark plug hole. replace the plug and turn it over . This will get them to fire up. Good luck DFD
Here are a few things to do >> How old is the gas in the gas tank? Get fresh fuel. Remove the water trap bowl at the bottom of the petcock, (gas valve). Any water or trash in the bowl? Drain a cup of gas from the tank. Is there any water or trash in the cup? Clean the bowl and filter screen if present, then re-mount them, ( not all bikes have a water trap bowl or screen ). Install a new stock NGK spark plug and try to start the engine. If the bike doesn't start and run properly then shut off the gas and remove the carburetor from the engine.
Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb. Remove the two screws on the outside throat of the carb and spray into the screw holes as well. < < READ CLOSELY > > Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two screws down. Only screw these in until they LIGHTLY seat. Now turn each screw one and one half turns outward. Put the rest of the carb back together, clean the air filter and install the carb. Let the float bowl fill then start the engine. Set the idle speed with the idle screw.
I am uncertain if the bike has ran for you or not. "Did pull the spark plug and kick started it." If the bike still will not run then the cam chain may be out of time. Why was the tensioner off the bike? Please rate this solution. Thanks budx5!