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The carb has been rejetted so the engine run without the lid - while the back fire may be annoying, it is not hurting anything - all you need to do is; 1) increase the exhaust back pressure (more restrictive exhaust) - 2) enrich the fuel mixture at the closed throttle setting - 3) set the idle speed higher.

Otherwise, reverse all the modifications made to make it run without the air box lid on - I'm sure the previous owner documented all the modifications so a subsequent owner would have knowledge of the extent of modification and have a base line to work from should changes need to be made for altitude, fuel quality and type of competition the engine would be subjected to.
 
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