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Thread: 1996 R1100R Spark plugs

  1. #1
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    1996 R1100R Spark plugs

    These are the old ones. I've installed the Bosch, one the manual say should be used.
    Any idea what issues I need to look at?
    Attached Images Attached Images

  2. #2
    JohnWC
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    I haven't seen those style/brand plugs for a while, (mine were Bosch). I believe I have a set just like it sitting in my parts box. I tried them, as with you, I was following the manual's recommendation. But I then switched to the Autolite plugs that everyone here said worked better. And they seem to. Sorry I can't remember the plug number but someone will add that to this thread. It's the surging that the Autolites do better with. I'm sure the Bosch ignite the fuel just fine.

  3. #3
    MOA #24991 Pauls1150's Avatar
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    I've disliked Bosch plugs for a looooong time.... NGK and Autolite always seemed to help the bike run better...

    Considering the overall lighting of the photo, yours don't look too bad; if you stick with NGKs, maybe one range hotter? But do an all-around overall tuneup first (valves, throttle body sync, air filter).

    Autolites for the 1100 is AP3923; available at any auto parts store (or they'll have 'em for you in 2 days) and they're a bunch cheaper than Bosch. Gap is 0.031"; Always check before installing them, and if they need to be reset, be VERY careful that you don't chip or otherwise damage the center electrode in the process.

  4. #4
    Registered User dieselyoda's Avatar
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    Don't get caught in the BMW loop that because it's BMW it must be different.

    Google "Spark Plug Analysis" and draw your own conclusions.
    1997 R1100RT, 1981 KZ 440 LTD, R80RT, R90/6 sidecar, K1100RS,1983 K100RS (Cafe now)

    “The major civilizing force in the world is not religion, it is sex.”

  5. #5
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    Your old spark plugs look fine to me. I actually put NGK in just about all of my engines, be it car, boat, lawn mower, etc. However, I switched to Autolite for my 97 RT, about 30k miles ago and never looked back. Starts and runs smooth as ever.

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