Rich or Lean?
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Thread: Rich or Lean?

  1. #1
    Senior Member jannaruto's Avatar
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    Rich or Lean?

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  2. #2
    Senior Member Fred's Avatar
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    Rich.
    2003 TW200 "Betty Boop"
    2006 TW200 "Nibbler", a.k.a. “Mr.Gizmo"
    Hidden Content All Things Considered I’ld Rather Be Motorcycling

  3. #3
    Senior Member jannaruto's Avatar
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    Quote Originally Posted by Fred View Post
    Rich.
    Rich like a lot or just a tad?

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  5. #4
    Senior Member jannaruto's Avatar
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    Now is lean?
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  6. #5
    Super Moderator Purple's Avatar
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    Still rich

    And check the plug gap ......

    Spark Plug Inspection

    There's a lot of misleading information out there - but this is the best link I can find for you .....
    (Warning - Forum may contain nuts) ...... Hidden Content

    TW200 - 1998 - Japanese import - 7000 miles on the clock - TW225 Special Edition 2007
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  7. #6
    Senior Member jannaruto's Avatar
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    Quote Originally Posted by Purple View Post
    Still rich

    And check the plug gap ......

    Spark Plug Inspection

    There's a lot of misleading information out there - but this is the best link I can find for you .....
    The second message I've sent is a whole new spark plug I purchased few hours ago, mounted, runned for like 20 mins and checked with you guys, if it is still rich a bit I will decrease more the pilot screw

    But at this point it will be tomorrow or in the weekend since I will need the bike a bit and can't mess with it haha
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  8. #7
    Super Moderator Purple's Avatar
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    Take the pilot back down to two turns – and start thinking about the main jets you had on order

    The pilot jet at two works for most people, and is a reliable starting point – but most of the work is done by the main jet once you get above 30% throttle

    If the bike was set up by its previous owner with a leaking rubber carb boot, he may have increased the main jet to compensate

    Like I said in the beginning – one step at a time or you will lose track of what worked ……
    Fred and TopPredator like this.
    (Warning - Forum may contain nuts) ...... Hidden Content

    TW200 - 1998 - Japanese import - 7000 miles on the clock - TW225 Special Edition 2007
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  9. #8
    Senior Member jannaruto's Avatar
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    Quote Originally Posted by Purple View Post
    Take the pilot back down to two turns – and start thinking about the main jets you had on order

    The pilot jet at two works for most people, and is a reliable starting point – but most of the work is done by the main jet once you get above 30% throttle

    If the bike was set up by its previous owner with a leaking rubber carb boot, he may have increased the main jet to compensate

    Like I said in the beginning – one step at a time or you will lose track of what worked ……
    I am messing with carburetor because I swapped the boot from airbox to carburetor, so now I am sure there is a very leak-less connection so I have to screw in more the pilot screw, that's why I am checking with you guys
    Fred likes this.

  10. #9
    Senior Member elime's Avatar
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    Some people called this to lean. Maybe so but it ran very very well !!!! #112 high speed jet, #40 pilot, and about 2 turns out, maybe a little more.

    9-12-'16
    P3060026.JPGP3060023.JPGP3060024.JPG

    Same plug and engine 6 months later and still running very very well. Lots of power, very responsive.
    3-30-'17

    P9210030.JPGP9210029.JPGP9210030 (2).JPG
    Last edited by elime; 01-18-2018 at 07:17 PM.
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    Long live the internal combustion engine!

  11. #10
    Senior Member Ski Pro 3's Avatar
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    Look deep into the plug where the insulator meets the body. You'll see a dark band. How wide the band is will tell you how rich the motor is jetted. Here's a photo of cut plugs so you can see where to look for the band;



    Timing will also affect a plug reading. The proper plug temperature range is another. Fuel can too. For example; adding oil to the gas will thicken it's viscosity and lean out a plug's reading.

    Also where on the insulator color is showing will tell you where it may be lean or rich;



    The plug in the middle is the correct color;

    Last edited by Ski Pro 3; 01-19-2018 at 12:26 PM.
    Dryden-Tdub, Maj and TopPredator like this.
    The bear slayer!

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