You have probobly check these things but worth a good look.
1. Is the choke working correctly
2. Is there extra air getting into fuel mix? Air filter and pre filter in good order and not perrised, Are the air box rubbers sealing on carbs and air box 100% these tend to harden an draw back into airbox off the carbs.
3. Check the above then remove the air filter and clean all part in air box housing any dirt/particals removed check deeper into air box also as there can be residue build up there, remove the pre filter from top of airbox housing and clean replace filter ir required start bike and warm up do not over rev with filter element out , spay some carb cleaner up and into air box slowly adding throttle as you do so, do this several times refit with new air filter if required fit the top of the housing checking that the little rubber gasket is in tact.
4. Check also the petrol tap is working correctly the vacuum, may not be 100% causing your power lag/starting problem.
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