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Thread: Spark Plugs

  1. #1
    Join Date
    30th March 2006 - 13:40
    Bike
    1987 Honda CBR 600 FH
    Location
    Christchurch
    Posts
    121

    Spark Plugs

    I have just gone for a ride and my bike started running funny...
    Sounded 'fluttery' around 5-6000 rpm and when riding at 100kph it kinda went faster and slower at constant revs...
    My mate thought it could be running on three cylinders and suggested i check the spark plugs.
    I ripped the spark plugs out of my bike (as an aside my efforts in attempting to remove the damn things showed that having good tools makes a job much easier - I spent around an hour trying to get the plugs out with crap tools... went down to repco and got a motorbike plug tool for $4... didnt work. Went back and got a set of deep sockets by powerbuilt and bam the plugs just fell out.) and here are some pictures of them.


    The third one from the left is whiter than the others...
    what does this mean?
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  2. #2
    Join Date
    3rd June 2006 - 01:26
    Bike
    K6 GSX1400
    Location
    Auckland
    Posts
    2
    I have experienced a similar if not the same problem with my bike, the solution was purchasing new spark plugs. The cause of my problem was a tired spark plug plus the clearance measurement had decreased.

    Apparently they are suppose to be replaced every 8,000km so when this happened to me it was bang on 8,000km since they were last replaced.

    Once changed, I also noticed an increase in power and fuel mileage increased marginally.

  3. #3
    The second from the right seems to be running leaner than the third from the left to me.....

  4. #4
    Join Date
    17th February 2005 - 11:36
    Bike
    Bikes!
    Location
    Christchurch
    Posts
    9,651
    'One of these things is not like the others...'. Your plugs should last well past 8000kms. Hell even my plug chewing RZ500 could use a set of plugs longer than that.

  5. #5
    Join Date
    30th March 2006 - 13:40
    Bike
    1987 Honda CBR 600 FH
    Location
    Christchurch
    Posts
    121
    Yeah my plan at the moment is to go get some new plugs tomorrow and see what that does... I actually have no idea how long since the plugs were replaced. All i know is that i havnt replaced them since i got the bike 6 months ago.

    Yeah i did notice something funny about the second from the right plug as well... Thanks motu for the help

  6. #6
    Join Date
    6th November 2004 - 14:34
    Bike
    SUZUKI TR50 STREET MAGIC
    Posts
    2,724
    re that grey plug check for an air leak or partly blocked jet

  7. #7
    Join Date
    13th April 2006 - 20:38
    Bike
    2005,suzuki,marauder vz800
    Location
    hamilton
    Posts
    292
    would of thought you're get more out of the spark plugs, i would be leaning towards the carbs.

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