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    Author Topic: Champion RJ12YC Spark Plugs for 440  (Read 7670 times)

    Offline 7Dcuda

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    Champion RJ12YC Spark Plugs for 440
    « on: May 31, 2010 - 08:11:57 PM »
    After doing a search for the best suggested spark plug for a 440 I derived at the answer of Champion RJ12YC.   So I  just bought them to discover that the tip/threaded portion of the RJ12YC's  are much longer than the Bosch plug that I removed.  Do you have to have a certain setup to run the RJ12YC's?  Since the plug that I removed is shorter than the  RJ12YC I'm concerned that the  RJ12YC  is too long.  Can someone clarify this...any info. would be appreciated.
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    Offline 72cudamaan

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    Re: Champion RJ12YC Spark Plugs for 440
    « Reply #1 on: May 31, 2010 - 08:16:25 PM »
    Stock heads or aluminum?            Stock pistons or domes?
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    Andy  (phukker whither)

    Offline 71chally416

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    Re: Champion RJ12YC Spark Plugs for 440
    « Reply #2 on: May 31, 2010 - 08:22:11 PM »
    If the plug is too long it'll just carbon up the threads sticking into the combustion chamber and make it difficult to remove. 
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    Offline 7Dcuda

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    Re: Champion RJ12YC Spark Plugs for 440
    « Reply #3 on: May 31, 2010 - 08:23:12 PM »
    Quote from: 72cudamaan on May 31, 2010 - 08:16:25 PM
    Stock heads or aluminum?            Stock pistons or domes?


    Stock Heads, flat top pistons
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    Offline 72cudamaan

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    Re: Champion RJ12YC Spark Plugs for 440
    « Reply #4 on: May 31, 2010 - 10:15:53 PM »
    Well , an rj12yc plug has awfully short threads. I am surprised that  the Bosch plug has shorter threads. Are u sure on the part #  of the plug u have right now ?
    « Last Edit: June 01, 2010 - 08:24:53 AM by 72cudamaan »
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    Andy  (phukker whither)

    Offline Chryco Psycho

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    Re: Champion RJ12YC Spark Plugs for 440
    « Reply #5 on: June 01, 2010 - 02:48:29 AM »
    RJ12YC is the correct plug for your engine
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    Offline 7Dcuda

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    Re: Champion RJ12YC Spark Plugs for 440
    « Reply #6 on: June 01, 2010 - 08:23:35 AM »
    Quote from: Chryco Psycho on June 01, 2010 - 02:48:29 AM
    RJ12YC is the correct plug for your engine

    OK thanks...not sure how much room there is between the piston and the plug when the piston is at TDC so when I saw how much longer the RJ12YC was compared to the plug I removed it worried me.   
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    Offline ireland383

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    Re: Champion RJ12YC Spark Plugs for 440
    « Reply #7 on: June 01, 2010 - 07:58:43 PM »
    Quote from: Chryco Psycho on June 01, 2010 - 02:48:29 AM
    RJ12YC is the correct plug for your engine
         :iagree:  That is the correct plug.
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