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  1. #1
    hankpajari's Avatar
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    Replacement plug for RCJ7Y

    Hi

    I just bought a couple of Bosch WS7F plugs from Pep Boys today. I asked for Champion RCJ7Y and these were supposed to be the replacement. The package for the Bosch plugs says that they replace Champion CJ7Y plugs not RCJ7Y. I believe that the R stands for resistor and that resistor plugs suppress noise.

    Does anyone know if these Bosch plugs are OK or will I be getting ignition noise by not using a resistor plug?

    Thanks

    Hank
    Hank
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  2. #2

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    RE: Replacement plug for RCJ7Y

    Yes you need the ones with the R in front ,yes they can create noise.
    Bruce A Swartfager

  3. #3
    TLH101's Avatar
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    RE: Replacement plug for RCJ7Y

    Check your local NAPA store for the RCJ7Y. I got some here for about $2 a plug. They even stock the little RDJ8J plugs that I use in my FPE 2.4.
    Terry
    "Old Fart" in training. (not to be an R/Cer, but to be an "Old Fart")
    P-39 Brotherhood # 6

  4. #4

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    RE: Replacement plug for RCJ7Y

    WSR7F or more common WSR6F
    TKG
    Too much power is just about right.

  5. #5
    hankpajari's Avatar
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    RE: Replacement plug for RCJ7Y

    Thanks guys, this is what I thought.

    Hank
    Hank
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  6. #6
    Moderator w8ye's Avatar
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    RE: Replacement plug for RCJ7Y

    I've used the RCJ7Y and the little RDJ8J both in the same engine (not at the same time). I didn't see any difference in the way the engine performed(same rpm). Actually there's not much difference in the actual size of the plugs. They are the same height and the ceramic insulator is about the same size. The difference being as the "C" plug has a gasket and the "D" plug is tapered seat with the smaller hex. The heat range is different but doesn't seem to matter that much?

    Right now there is a Bosch WSR6F (Says R10 ### on the insulator) plug in my Homelite 30 which normally uses the Champion RCJ7Y but I have run the RDJ8J in it. What ever's in my flight box?

    The non resistor plugs are trouble city and a invitation to disaster in a R/C model.

    I bought a box of each specification Champion plugs from the local NAPA auto store. They didn't have the "R" type in stock but had them the next day for me.

    I've never had any luck getting the right part from those teenage girls at the Pep Boys store. There's too many other auto parts stores to go to without bothering with Pep Boys.

    Enjoy,

    Jim
    Attended the CutFinger Institute of DirtNap University for years but never did graduate....
    Recipient, Mangledhand award August 2008
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    Original AMA #31261

  7. #7

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    RE: Replacement plug for RCJ7Y

    WHat is a good subsitute for the NGK BPMR6F plugs?
    Aircraft Proving Grounds
    http://www.rcaircraft.net/
    Information on the building and flying of Radio Control Aircraft.
    Site for hobbyist in the R.C. Aircraft modeling world.

  8. #8
    hankpajari's Avatar
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    RE: Replacement plug for RCJ7Y

    Hi

    You are right, Napa was able to get them in 1 day. Bought a couple since they are only $2.59 ea.

    By the way the plug apparently has a new Champion number, 859.

    Hank
    Hank
    AMA 62359
    IMAA 27338
    NSRCA 3803
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