Only 3 things to check air, fuel and spark. Check your spark by removing your left spark plug cap and place an old plug in it, then touch it to the side of the block. Crank the engine if you see a spark then, move to the right hand side and do the same. If you have spark on both sides, then both coils should be OK. If no or very weak spark, your coils could be faulty.
If you have good spark, check your air filter see if it is clean. If it looks dirty it is dirty and won't flow good air. If it is oily then your pcv is blocked.
If clean and good, then check fuel. First thing to check is, is there any fuel in carb bowl. On bottom of the bowl should be an allen head screw, undo it only until fuel comes out, check all four (one at a time). If no or very little fuel, then maybe your needle and seat are worn or stuck. lightly tap each offending carb and see if fuel comes out. If fuel starts to flow, shut off screw, do all carbs the same way. Try to restart bike, if it starts and stalls. You will need to replace all 4 needles and seats. Kawasaki's are notorious for dropping carbs.
SOURCE: after cleaning the carb it backfires in the carb
How did you celan the carbs?? Need to strip and dismantle all parts / blow out with compressed air / Check float adjustment etc./ reassemble, ensure there are no air leaks.
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