Had very interesting Spark plug Failure, maybe this info could help others

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This topic contains 2 replies, has 2 voices, and was last updated by  hundredmph farmer 1 day, 17 hours ago.

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  • #16051

    GregCrago

    Coming back from Longest Day Ride, My secondary spark plug fell apart and the ceramic core dropped out of it’s metal threaded shell. This allowed hot exhaust to melt my secondary coil and the engine died.

    I was using Bosch YR5LDE Spark Plug with 10kmiles on it.

    Had to drop my bike off at someone’s house and pick it up later.

    Now I need another secondary coil and it seems to be caused by this BOSCH spark plug.

    I have crash bars and I don’t think the plug was damaged before failure.

    If you use BOSCH YR5LDE plugs, watch out……

    Greg

    #16083

    GregCrago

    Update:

    The underside of the head has large BLACK STREAKS, almost like someone took a spray can and painted the bottom of the cyclinder head.

    After talking with some engine experts, It may appear that the spark plug failure was not instant, but may have been a slow leak over many miles. Since it was under the head, I did not see this black mark forming. The end result was the slow leak around the insulator eventually worked the insulator out and then I heard the exhaust and lost power in the engine.

    #16084

    hundredmph farmer

    Greg,

    Any chance those were knock-off Bosch spark plugs? Lots of NGK Chinese knock-off spark plugs  floating around but you don’t hear of it being a big problem with Bosch. There is market, they are expensive, so there must be some fake Bosch plugs floating around.

    Maybe give Bosch customer service a call and ask how to identify fake Bosch spark plugs.

     

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