ques about plug chop

Discussion in 'Motorized Bicycle General Discussion' started by blckwlfny1, Jul 13, 2013.

  1. blckwlfny1

    blckwlfny1 New Member

    Joined:
    Jul 14, 2010
    Messages:
    128
    Likes Received:
    0
    if you've been using the spark plug a little and the motor was running rich (black plug).
    ... and then you re-jetted, soaked the plug overnight in carb cleaner and laquer thinner, would you still be able to get an accurate reading or will the black color that is baked on to the plug forever mask any other reading?
    Thanks dance1
     
  2. KCvale

    KCvale Active Member

    Joined:
    Feb 28, 2010
    Messages:
    3,890
    Likes Received:
    19
    If you can clean the white inner part no problem, but even as long as it is dry you can tell.
    You do know that gas richness is not the only factor that will foul a plug right?
    Temp range of the plug is a factor too.
    Search for the 'Best Spark Plug' topic for more and you may want to just toss that stock kit plug in the trash ;-}
     
  3. mapbike

    mapbike Active Member

    Joined:
    Mar 14, 2010
    Messages:
    5,380
    Likes Received:
    1
    some carb cleaner and a wire brush is a good way to clean the plug, and as kCvale said, make sure you are using the correct plug and a good quality one.

    I tune all my engines to run a light chocolate brown color plug, the type of oil you use and the amount in the mix will also have an efect on the plug color, main thing is you dont want an engine running in a way that is so lean that you end up with a white or very light gray color plug.

    If you're running Opti2 or another high grade synthetic oil at 100:1 ratio, then a medium to dark gray to light brown may be expected, but running conventional oil the plug color should be brown in my experience.

    map
     
    #3 mapbike, Jul 13, 2013
    Last edited: Jul 13, 2013
  4. blckwlfny1

    blckwlfny1 New Member

    Joined:
    Jul 14, 2010
    Messages:
    128
    Likes Received:
    0
    im running a DeNardis motor, boyesen reeds, and an iridium spark plug
    fuel mix is at the recommended 40:1 with Yamaha 2-stroke oil
    ive idle jetted down 5-sizes and its still black
    how can I tell the difference from excess oil in the fuel ratio, or a cold plug, or a rich carb?
    ...motor wont start without choke but starts right up with it
     
  5. mapbike

    mapbike Active Member

    Joined:
    Mar 14, 2010
    Messages:
    5,380
    Likes Received:
    1
    Sorry not familiar with what you have so any advice I give now would just be guessing on my part, hopefully someone with more experience with what you hqve will chime in and help.
    Map
     

Share This Page