Victorian Motorcycle Wreckers
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  1. #1
    NSW Crew - Chief Mechanic


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    Patrick
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    1998 GPX 250R (Fightered)
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    Oct 2009
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    Newcastle
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    Default Side gapping spark plugs

    I was wondering if side gapping spark plugs was worth it?

    I bought 4 spark plugs for $5 from england for my gpx as spares for my current spark plugs (which aren't dead yet).

    Should I side gap two of them and run them to see what they're like? it's only $2.50 and a bit of effort to swap plugs...

  2. #2
    Full Of It


    Real Name
    Tony
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    2001 Nomad (my baby)
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    Oct 2009
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    Vic
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    as long as they are the right fit (type) and in good nick, set the gap to speck...all should be good.
    Not like these!!

    Is Everybody Happy?

  3. #3
    I'm Getting There


    Bike
    2008 VN900 Classic
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    Jan 2009
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    Central Coast
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    Chunked, for the dumbasses like me what is side gapping?

    Aj

  4. #4
    NSW Crew - Chief Mechanic


    Real Name
    Patrick
    Bike
    1998 GPX 250R (Fightered)
    Join Date
    Oct 2009
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    Newcastle
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    That is the gap measurement of a spark plug. It is where the spark goes between.



    This is a stock plug.




    This is a side-gapped one. You can side-gap it more but since the spark goes to the edge of the electrode it eventually wears down and you have to replace plugs more often.


    Side-gapping shortens the electrode strap allowing more space so the resulting ignition (from the spark) goes straight down the cylinder as opposed to around the strap and THEN down the cylinder.

    Think of a trail of petrol being lit from one end with a large piece of metal covering most of the width of the trail at the beginning. It will slow down the speed of the flame down the trail. That is what a normal spark plug does.

    The gains are minimal (a couple of hp at best) but every little bit helps and it only takes me a few seconds to grind the electrode strap shorter.

  5. #5
    Full Of It


    Real Name
    Robert ,Stackman ,Farmer
    Bike
    Well what else would it be 2008 KLR650e Plus the bosses Kvf360 to play with when needed
    Join Date
    Jul 2009
    Location
    Esperance WA
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    1,365
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    mmmmm May have to try that on my ute LOL
    GET A KLR650 UP YA MOTHER F***ER Why am i green with envey coz i ride one not operate one

    To find that special place ,You first have to go on special rides ....

  6. #6
    n00bie On a Mission


    Bike
    1991 GPX250
    Join Date
    Jan 2010
    Location
    Queensland
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    329
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    Gains are very Minimal
    A better spark mod is the pulsed spark that's used in conjunction with the high power coils
    Basically instead of it being one spark, its the First spark followed by 1-2 secondary pulsed sparks this helps propogate more burning

    But personally I do see the point of modding spark plugs, I just prefer to get top quality plugs and leave em be.
    Proud Owner of the Following
    1984 Kawasaki GT750 - Ready and waiting for license upgrade
    1991 Kawasaki GPX 250 - Daily
    1993 Nissan Sileighty (SR20DET Monster) - Daily/Weekender
    1984 Kawasaki Z250T Scorpion - Project (Almost finished)
    1986 Honda CT110 Postie - Project
    1977 Honda MT125 - Semi Retired Trail Bike (Entering Restoration)

  7. #7
    Doctor Kwaka


    Real Name
    Never you mind.
    Bike
    KZ550G1 1983, KZ440C1 1980, KZ1000E1 1979, CX500CC 1981(2), GL500(650)I
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    May 2009
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    South Australia
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    Quote Originally Posted by aj1249 View Post
    Chunked, for the dumbasses like me what is side gapping?

    Aj
    I'm glad you asked, I had no idea either.
    Regards,
    Arrne

    GT 550 (Rattle & Hum); a walk on the mild side.
    CX 500 Custom (Bleu Merde); every solution has a problem. Moving on.
    KZ 440C1 (Panama Red); he'll be back.
    KZ 440A1 (Glass-and-a-Half)
    KZ 650 D3 (Christine); %@$%# stolen- many years ago.
    KZ1000E1 (Growler)
    GL500I (); with 650 donk!
    Running old bikes is a matter of dollars and sense; I usually lack both.

    Currently Riding:


  8. #8
    Doctor Kwaka


    Real Name
    Never you mind.
    Bike
    KZ550G1 1983, KZ440C1 1980, KZ1000E1 1979, CX500CC 1981(2), GL500(650)I
    Join Date
    May 2009
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    South Australia
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    3,051
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    Default

    Quote Originally Posted by AJ2009 View Post
    ...
    Not like these!!
    So that's what the NGK factory looks like!
    Regards,
    Arrne

    GT 550 (Rattle & Hum); a walk on the mild side.
    CX 500 Custom (Bleu Merde); every solution has a problem. Moving on.
    KZ 440C1 (Panama Red); he'll be back.
    KZ 440A1 (Glass-and-a-Half)
    KZ 650 D3 (Christine); %@$%# stolen- many years ago.
    KZ1000E1 (Growler)
    GL500I (); with 650 donk!
    Running old bikes is a matter of dollars and sense; I usually lack both.

    Currently Riding:


  9. #9
    I'm Getting There


    Bike
    2008 VN900 Classic
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    Jan 2009
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    Central Coast
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    Thanks guys now i understand, but too bloody lazy to worry about those sorta gains from the 900!

  10. #10
    NSW Crew - Chief Mechanic


    Real Name
    Patrick
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    1998 GPX 250R (Fightered)
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    Oct 2009
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    Newcastle
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    Default

    yeah, when you ride a 250 a 2hp increase is a 5% increase when you've only got 38hp total lol.

 

 

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