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backfiring is caused during deceleration by the un-burnt fuel that gets sucked back into the cylinder. This best way to prevent this get the ECU re-tuned, or try to avoid deceleration by engine braking. engine braking can be damaging to motor and timing belt. Try to use the brakes more often when going down hills.

Read more: What_causes_backfiring_or_popping_in_the_exhaust_of_a_v-twin_motorcycle_engine

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Q: What is the problem Honda 250 backfire?
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