How does it Idle? Could be a leak around the intake between the engine and the carb. Or a problem between the air filter and the carb. Mine wont run well with the air filter removed. (too lean) Be sure the air filter is clean and oiled like it should be. Be sure the rubber fittings are tight and in good condition.
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another thought. Could the knocking sound be the valves or timing chain. Late timing or valves out of adjustment can cause backfireing or a Popping back through the carburator. Maybe check the engine compression. How many Miles do you have on the engine?
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