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  1. #1
    Supporting Member theradiostar's Avatar
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    Spark plug screw top removed for a reason?

    Here's an odd one for ya:
    On my 1970 Honda CB350 -- it arrived from the eBay seller with the screw tops off of the spark plugs. When I replaced the plugs, I attempted to put them in "whole", that is with the screw tops on. I've never seen them installed (on cars) without those screw things. But, the plug wires wouldn't fit with those tops on. Should they be on or off???
    Keihin 3D carbs
    floats at 26mm
    35-68-98 jets
    OEM air filters
    EMGO megaphones
    Yamaha/Hitachi coils
    Shack rectifier mod.
    NGK B8EGV plugs
    LB05EP caps

  2. #2
    Supporting Member MNellis's Avatar
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    Jan 2009
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    Re: Spark plug screw top removed for a reason?

    You need to look inside the plug cap and see what style the caps are. The NGK replacement caps I've used in the past were designed to have the screw on plug caps removed. I prefer this style since, in my experience, it provided a more consistent, less loosening up and more positive connection.
    Mike Nellis, CMRA Expert GSXR1K 1976 Honda GL1000 1968 Honda CL350 1975 Suzuki T500 1970 Honda CB450 K3
    Yamaha 660 Raptor 2001 Yamaha YZ426F Triumph Tiger 1050 KTM 450 XCR-W

  3. #3
    Supporting Member theradiostar's Avatar
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    Re: Spark plug screw top removed for a reason?

    All I can say is that the wires are made in Japan and I can't get them to fit the plugs unless I remove the screw tops. I just wanted to know that I wasn't doing something wrong. A user from the advrider forum nailed one of my major issues today when he told me to check and clean the idle carb jets. They were the only ones clogged. Amazing what a difference a tiny hole can make.
    Keihin 3D carbs
    floats at 26mm
    35-68-98 jets
    OEM air filters
    EMGO megaphones
    Yamaha/Hitachi coils
    Shack rectifier mod.
    NGK B8EGV plugs
    LB05EP caps

  4. #4
    deadpool's Avatar
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    Oct 2010
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    Ohio
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    205

    Re: Spark plug screw top removed for a reason?

    On my 1972 CB350, the NGK's that I have also require that the tops of the plugs be removed. I have not had any spark issues with my plugs and I think that it is a pretty common practice depending on what type of plug caps you use.
    1972 Honda CB350 Hardtail FOR SALE: http://www.hondatwins.net/forum/viewtopic.php?f=11&t=22787

  5. #5
    Super Moderator outobie's Avatar
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    Re: Spark plug screw top removed for a reason?

    nothing odd about it...they aren't supposed to be there. neither the stock caps or the aftermarket NGK caps need them to be there. the only time you'd need those little caps on a 350 is if someone has added aftermarket coils/plug wires with the moulded in automotive style connectors on them.

    Most bikes in fact, both new and old don't use them.
    CB350 K5 - Uber Café- Engine build 3
    CL350 K4 - Cafe build done waiting on final assembly
    CB350 K0 - Full restoration w/Hondaline bags & fairing
    SL350 K2 - Bubba Shobert flat track build on deck
    CB-1 400F - unrestored mint rider
    2012 Guzzi V7 Racer - Daily Ride

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