I would start by switching off the fuel, draining the carbs (draining screw underneath) and then open the fuel again to let some fresh fuel in. - This normally works for me on my 55W.
If that doesn't work, check to see if you have got a spark - unscrew the spark plug and turn the engine over while the spark plug is plugged in to the coil and touching the engine. You should get a fat spark.
Let us know how this goes.
Muro
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