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Chain saw carb.

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I am trying to service a 52 cc Plantiflex Chainsaw ( I think it is Chinese ). This model does not have a bulb primer ? It is not starting very well. I have just cleaned the petrol pick up filter which was a bit silted up probably with

two stroke oil. I am trying to work out how the fuel gets into the carb without a primer as the fuel tank seems to be below the level of the carb. Help me understand please. Thanks.

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I have never seen one of those, so have no idea what one looks like. Can only suggest you look at the Poulan Chainsaw Thread in Other Garden Machines and compare my images with your carb. 

Usually, if there is no primer bulb, then it primes/supplies fuel using a vacuum diaphragm system in the carb. 

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Most modern saws use a pulse tube from the internal engine pressure to supply fuel. Cracked or rotted lines can reduce the flow and cause low flow problems

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