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  • #1

    Plug Pondering??

    Hey all,
    I was wondering if anyone has switched to "hotter" spark plugs in Winter and back to "cooler" ones for Summer?
    I have been running only NGK bp6es plugs year 'round in my 79 XS1100f. While it is now August here in Northern California...we still have some very warm days. Nights and mornings are much cooler, so I just run the same plugs. Has anyone ever switched plugs fo "season" changes? If so, did you notice any change in fuel use or performance?
    Some days you're the pigeon..and some days you're the statue/

    1979 XS1100f
    Saddle bags, small wind screen and non-original rear shocks. Otherwise..completely stock.
    Tags: None
  • #2
    Originally posted by Welsh1100 View Post
    Hey all,
    I was wondering if anyone has switched to "hotter" spark plugs in Winter and back to "cooler" ones for Summer?
    I have been running only NGK bp6es plugs year 'round in my 79 XS1100f. While it is now August here in Northern California...we still have some very warm days. Nights and mornings are much cooler, so I just run the same plugs. Has anyone ever switched plugs fo "season" changes? If so, did you notice any change in fuel use or performance?
    I dont think you should have to switch plugs. Maybe if it got below freezing you could but I dont think you have that problem all that much in Cali
    Nathan
    KD9ARL

    μολὼν λαβέ

    1978 XS1100E
    K&N Filter
    #45 pilot Jet, #137.5 Main Jet
    OEM Exhaust
    ATK Fork Brace
    LED Dash lights
    Ammeter, Oil Pressure, Oil Temp, and Volt Meters
    Green Monster Coils
    SS Brake Lines
    Vision 550 Auto Tensioner

    In any moment of decision the best thing you can do is the right thing, the next best thing is the wrong thing, and the worst thing you can do is nothing.

    Theodore Roosevelt

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    • #3
      Plugs

      I lived in Ohio and ran the same plugs year round with no prob. 10 below to 100 deg above. Didnt do much riding in the 10 below though
      1979 XS1100 Special (Mad Max, OEM) Current
      1980 XS1100 Special
      1990 V Max
      1982 KZ750 LTD Twin
      1986 700 FZR Yamaha Fazer (faster then expected)
      1979 XS750 Special (my 1st Special)
      1974 CB750-Four



      Past/pres Car's
      1961 Catalina 389/1970 Torino GT 351/1967GTO 12to1 comp./ Roller cam/ T-10/ 456 gear/Tri-power/1967 GTO 400, 1969 Camaro, 1968 Z28, 2001 BMW M Roadster 0 to 60 in 4.5 sec. Jaguar XK8

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      • #4
        i messed around with different heat ranges a little while ago,
        with a hotter plug 'bp5es' the engine knocked
        around 4000rpm under load and sounded noisier,
        the colder i went the smoother and quieter
        the engine ran but noticed it lost a bit of power under load,
        i found that stock was best might try running bp7es in summer
        once the weather heats up.
        pete


        new owner of
        08 gen2 hayabusa


        former owner
        1981 xs1100 RH (aus) (5N5)
        zrx carbs
        18mm float height
        145 main jets
        38 pilots
        slide needle shimmed .5mm washer
        fitted with v/stax and uni pod filters

        [url]http://www.youtube.com/watch?v=3pA8dwxmAVA&feature=mfu_in_order&list=UL[/url]

        Comment

        • #5
          The stock-spec heat range is best for 99% of riding in 'normal' temps. I suppose that if riding in 100+ F temps a swap to a colder plug may reduce engine temp a bit, but the motor will be slow to warm up and run properly, as well as being more prone to fouling. Unless you're riding in sub-zero weather, the only reason to use hotter plugs would be if you have a serious oil-burner; a hotter plug will go a bit further before fouling...

          '78E original owner
          Fast, Cheap, Reliable... Pick any two

          '78E original owner - resto project
          '78E ???? owner - Modder project FJ forks, 4-piston calipers F/R, 160/80-16 rear tire
          '82 XJ rebuild project
          '80SG restified, red SOLD
          '79F parts...
          '81H more parts...

          Other current bikes:
          '93 XL1200 Anniversary Sportster 85RWHP
          '86 XL883/1200 Chopper
          '82 XL1000 w/1450cc Buell, Baker 6-speed, in-progress project
          Cage: '13 Mustang GT/CS with a few 'custom' touches
          Yep, can't leave nuthin' alone...

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