Adventure Motorcycle Magazine Subscribe Now

Results 1 to 10 of 10
  1. #1 Too rich or too lean, which direction to turn the air screw pls? 
    C-Moto Not-so-Noob Genesequas's Avatar
    Join Date
    Aug 2012
    Location
    South Africa
    Posts
    17
    Hey C moto people! Compliments of the new year, may you prosper ever more!

    Ok, so now back to my problem. I recently bought myself a xmas prezzie in the form of a performance exhaust. All good besides the difficulty in idling and slight popping sound when I release the throttle while slowing down. Performance overall is deffinitely better than I had with the stock exhaust. Sounds great too! However I suspect my bike is running too lean so heres my question..

    Which direction do I turn the air screw, clockwise or anti-clockwise. Thus far I have fiddled a bit with both directions and so far it seems slightly better. However I dont know if its because its now leaner or richer that has done it.

    Please help!

    My ride is the Loncin Jedi 250
    Reply With Quote  
     

  2. #2 Re: Too rich or too lean, which direction to turn the air screw pls? 
    Senior C-Moto Guru Zorge's Avatar
    Join Date
    Oct 2009
    Location
    Σερβία
    Posts
    1,745
    I would try to make a rich mixture with clockwise screwing. So far it worked great for me.

    Still, I would not be stopped at just on half or quarter of a circle screwing and unscrewing; I would checked color of soot on the spark plug electrodes. This is a good indicator of the quality of the air-gas mixture.
    Ask me nothing - I DO NOT speak english. Really...
    Reply With Quote  
     

  3. #3 Re: Too rich or too lean, which direction to turn the air screw pls? 
    C-Moto Not-so-Noob Genesequas's Avatar
    Join Date
    Aug 2012
    Location
    South Africa
    Posts
    17
    Ok thanks will try it and see..
    Reply With Quote  
     

  4. #4 Re: Too rich or too lean, which direction to turn the air screw pls? 
    Senior C-Moto Guru ZMC888's Avatar
    Join Date
    Oct 2008
    Location
    Zibo, Shandong - Sometimes SW England
    Posts
    2,239
    Doing a clockwise setting will probably work for a richening an idle setting. However I would put in a new plug run it at mid revs and hit the kill switch and have a look at the color and do it again for high revs any white and go with a bigger jet or raise the needle. On the electrode White is too lean golden to chocolate brown is best, black being too rich. You might want to change to a clip on air filter first and do the whole carb set up once.
    Reply With Quote  
     

  5. #5 Re: Too rich or too lean, which direction to turn the air screw pls? 
    C-Moto Not-so-Noob Genesequas's Avatar
    Join Date
    Aug 2012
    Location
    South Africa
    Posts
    17
    Right..so I turned it all the way clockwise until it could turn no more, I then turned it back one revolution anti clockwise and guess what? She idles just fine now at just over 1000RPM. Granted its a little low but before she used to just die out and not idle at all. I'm gonna test her on the open road tomorrow and see how all this affects performance. I'm assuming now that she has better fuel richness she will run better. Thanks for your help guys!
    Reply With Quote  
     

  6. #6  
    C-Moto Not-so-Noob
    Join Date
    Jan 2013
    Location
    Manchester UK
    Posts
    29
    Where did you get your exhaust from ???

    I thinking of getting a performance exhaust for my Lexmoto LSM 125.

    Im after something a little louder and deeper sounding.
    Reply With Quote  
     

  7. #7 Re: Too rich or too lean, which direction to turn the air screw pls? 
    C-Moto Not-so-Noob Genesequas's Avatar
    Join Date
    Aug 2012
    Location
    South Africa
    Posts
    17
    I asked my dealer and it so happened they were importing a whole container full of slip ons. My guess would be for you to do the same. Although bare in mind the other carb adjustments etc that you might need to do to make her run optimally. It's still an on going process for me since I am doing things myself without the help of a mechanic. My bike has deffinitely a much louder, deeper more powerful sound. Traffic moves out of my way now which is a big plus for safety!
    Reply With Quote  
     

  8. #8 Re: Too rich or too lean, which direction to turn the air screw pls? 
    Senior C-Moto Guru Zorge's Avatar
    Join Date
    Oct 2009
    Location
    Σερβία
    Posts
    1,745
    Quote Originally Posted by Lowi View Post
    Im after something a little louder and deeper sounding.
    Something like this - http://www.youtube.com/watch?v=Ee-Aoa_Mf9c ?
    Ask me nothing - I DO NOT speak english. Really...
    Reply With Quote  
     

  9. #9 Re: Too rich or too lean, which direction to turn the air screw pls? 
    C-Moto Not-so-Noob Genesequas's Avatar
    Join Date
    Aug 2012
    Location
    South Africa
    Posts
    17
    Yup sounds pretty close to mine besides his idles perfectly..mine struggles when it's cold. Need new jets for my carb!!
    Reply With Quote  
     

  10. #10  
    C-Moto Not-so-Noob
    Join Date
    Jan 2013
    Location
    Manchester UK
    Posts
    29
    Quote Originally Posted by Zorge View Post
    Yep something like that ;)
    Reply With Quote  
     

Similar Threads

  1. Dangers of running lean
    By spencer2004 in forum Modifications (Cosmetic and Performance)
    Replies: 8
    Last Post: 02-27-2012, 09:35 PM
  2. air fuel screw pulse adrenaline 125
    By pulsepat in forum Modifications (Cosmetic and Performance)
    Replies: 1
    Last Post: 07-07-2011, 10:04 PM
  3. New over-sized exotic bike for super-rich bike polishers available!
    By ZMC888 in forum Industry News and Moto Talk
    Replies: 7
    Last Post: 03-06-2011, 08:21 AM
  4. Soft soil/gravel; I cannot turn
    By slabo in forum Dirt n' Dual-Sport
    Replies: 3
    Last Post: 04-22-2010, 02:20 AM
  5. Replies: 3
    Last Post: 10-23-2009, 06:42 PM
Bookmarks
Bookmarks
Posting Permissions
  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •