| Petrol starvation for sure - you've just got to work out the cause.
Could be anything from a blocked or incorrectly fitted fuel filter through to a kink in the petrol tank breather hose causing a vacuum lock. Could even be a faulty choke or poorly setup carbs.
How long ago was it serviced? If not that long ago you should take it back and explain as I'm sure they'll be able to help. | 
antonye
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