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I would start off by preforming a correct carb adjustment which includes the accelerator pump adjustment. Another thing would be checking the jetting and also making sure it is the correct carb for the application as well as checking the secondaries are working correctly. I would again check there are no vacuum leaks. And check your float adjustment. Check your coil, check your plugs including try replacing them and gap accordingly, checking valve adjustment, check timing and making sure balancer has not moved (the ring), as well as making sure you have "good" fuel and that the fuel has no debris.
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