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  1. #1

    Sea doo XP limited backfiring out the exhaust

    I have a 1999 Sea doo XP limited w 947 engine
    backfiring out the exhaust when I crank it
    and won't start
    carbs were gunked up with old gas so both were rebuilt, accelerator pumps cleaned & tested, fuel system cleaned, fresh fuel, etc...
    compression is good, crank/pistons seems to be in line, etc...
    currently checking the mag side flywheel key
    also pondering an air leak in the engine

    Any others had this problem or something similar


  2. #2

    Join Date
    Jul 2005
    when the carbs were off something could of gotten stuck inside the reed cage area or a reed is broken. Simple, take the carbs back off & reeds out & check.


  3. #3
    PEST!'s Avatar
    Join Date
    Jun 2008
    Rockledge Florida
    While the carbs are off and your checking the reads make sure the Needle and seats are set right. I have forgotten to check and had a carb dumping fuel. It gets into the pipe and gets ignited.

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