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these ATVs do a lot of hard work for size of motor
worth checking other things as per normal servicing
new spark plug
clean air filter
drain and add new fuel to tank
wont hurt to clean the carby or bowl contents
if fitted with a fuel filter inline .. fit a new one
The timing is not adjustable. I would start with a clean air filter, clean carb, good spark plug, check and make sure that your cam timing matches your flywheel.
The carburetor choke valve might be stuck open or not closing when the engine is cold. The engine needs a richer mixture to start. Too rich a mixture (flooding) can also cause trouble. Turn the fuel valve off to be sure the carb isn't leaking when not in use. If it smokes black on startup, it's flooding. Also check the condition of the spark plugs.
that is just a hand primer for when you run out of fuel. you may need to change the fuel filter. and clean out the fuel chamber and veins in the carb. if filter is old 2 years then it should be changed.
If you are certain the spark plug(s) is in good condition and correctly gapped, and the magneto is working normally, then you may have a fuel system problem. A quick diagnosis of fuel system issues is to spray a shot of starter fluid or WD-40 into the intake through the throttle body. If the engine fires for a bit then quits, it's a fuel system issue. Small engines do not do well with old ethanol-containing fuel. If it's turned yellow, drain it out and replace it, and remove any in the carburetor float bowl also.
Air leaks in the carburetor or intake manifold gasket may also cause hard starting. A sticky carburetor float or float valve is another possibility, especially if the engine was sitting for a long time with ethanol fuel drying out in the float bowl. A dirty air filter will also cause starting issues.
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