If the problem is in the fuel system you might try adding some 2 stroke oil to the fuel tank next time you fill up.
Use a low ash or ash free version, FC or TC-W3, mineral or semi synthetic at 1:500. It will clean and lubricate the system and might solve the problem. Just add 100ml and fill up for a 50L tank.
People use it all the time at that ratio for petrol and 1:200 for diesels. Worth a try.
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