Backfires can be caused when excessive fuel from cold starting ends up in the exhaust system and then ignites from a firing stroke from the engine. They can also occur if the engine timing is not correct. Kick starters are a mechanical way of turning over the engine, perhaps there is a problem with gears or levers that are employed on your scooter.
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Backfires can be caused when excessive fuel from cold starting ends up in the exhaust system and then ignites from a firing stroke from the engine. They can also occur if the engine timing is not correct. Kick starters are a mechanical way of turning over the engine, perhaps there is a problem with gears or levers that are employed on your scooter.