Spark timing or valve timing.
Spark time is fixed and controlled by the crank trigger. There is only two things that can change spark timing. a twisted crank ( very rare ) a sheared flywheel key (Also very rare)
Valve timing, remove the timing inspection plug and the the pull start housing, you will use the nut on the crankshaft under the pull start to turn the crank to bring the timing mark TDC-COMPRESSION STROKE - into the timing inspection hole. remove the spark plug so your not fighting engine compression to turn the motor.
Now remove the the valve cover and check the alignment line on the cam. the alignment line should be level with the top of the edges of the cylinder. if not you have a problem
I put a new top end on it in got the head reworked put it all back together but can't get it back in time. My number is 9012127325 if u could give me a call thanks
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SOURCE: How to fix a leak fuel from the carbuator or primer for a atv arctic cat 500 2005
YOUR GOING TO HAVE TO TAKE APART AND PUT A BIGGER RUBBER O RING INTO IT.
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