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there can be several causes of back firing ,
1. fuel/air mix is wrong .
2. ignition timing wrong ( unlikely unless Ecu caput ).
3. air leak in carb rubbers causing fault no1.
4. hole in exhaust system again causing fault no1.
5. defective spark plug/s .
6. defective coils / HT system.
I hope this helps & You can get it sorted soon.
Good luck
D,D
What else can I help you with?
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