My yamaha ttr 125l wont start it keeps turning

too much fuel will cause same symptoms, grab a can of car throttlebody cleaner from the parts store, and pinch the fuel line off, and attempt to start till fuel is empty in the bowl of the carb, then spray cleaner in carb with the throttle full open 2 to 3 times close throttle, start, as it attempts to run spray slowley while engine runs, adjusting the flow as you rev engine.this eleminates poss bad gas or carb problems. if it runs fine this way then check gas, and check the carb. (while cleaning use a small wire to clean the tubes inside the carb as well, good luck!

Is the gas valve ON?

If yes, check the filter which may be in the valve or it may stand alone elsewhere. Follow the hose to the carb to find it.

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