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If its a 2 stroke try fitting "Brand New" Spark plug. If problem persists check plug condition as could have too much 2 stroke coming through via 2 stroke pump, Water in the fuel or poorly setup Carburettor.
First, be sure they actually do fit the bore. Take a ring and insert it in the bore. push the ring halfway into the bore using the piston. There should be about a 1/32" gap in the ring. Anything more than 1/16" and you need rings the next size up. If the ring won't go into the cylinder because the gap fully closes, the rings need to be a smaller size.
With the correct size rings, put them on the piston. Some pistons have an index pin in the ring groove Fit the gap to the pin. Put the piston mid-stroke and place the cylinder over the top of the piston. Squeeze the rings closed as you gently tap the cylinder downward and over the rings.
I suppose is 4 stroke engine.Before adjusting the breaker points gap at .020 check if the breaker points are burned.Also check the condenser(change it).Change the spark plug with a new one with the same heat range.The plug gap is .030.
if you remove the air box and fit a sports filter the engine will run lean and do damage and will prob run much worse with a higher fuel consumption, unless you know how to read spark plugs to set the mixture I wouldnt do it.....
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