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    air fuel ratio

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    • Member since
      March, 2008
    air fuel ratio
    Posted by srxdude on Tuesday, May 12, 2009 12:50 PM

     Help me if you can please. I would like to find out what the air fuel ratio is on 2-stroke engines. I have a guage to install on my 09 crossfire 1000 sno-pro. Would like a starting point if possible. Thanks for your help in advance if you can.

    • Member since
      July, 2005
    Posted by dyna-tek racing on Tuesday, May 12, 2009 8:47 PM

    If you install the sensor in the top of the muffler it should be around 13to 1 or 13.5 to 1 for safe trail riding.

    master mechanic-outboard,sterndrive,pwc,snowmobile. dynamometer facility -crank repair -cylinder repair-trail and race motors-shock service clutch machining and balancing. complete racer support- free technical support-racer discount programs Todd Guthrie 1-260-316-2839 or like us on face book and keep up to date on monthly specials using our facebook page.See new innovative product as soon as it gets built

    • Member since
      January, 2007
    Posted by Experts on Wednesday, May 13, 2009 11:55 AM

    We don't really use an air/fuel ratio gauge when tuning in a snowmobile. We prefer to use EGT gauges and tune off of exhaust gas temperatures. We only use air/fuel ratio gauges to tune in 4-stroke machines. On a 4-stroke you want your air /fuel ratio to be between 12.8 - 13.2.


    Thanks,

    Larry Houle
    SPEEDWERX, INC.
    • Member since
      March, 2008
    Posted by srxdude on Thursday, May 14, 2009 5:48 PM

     Is the sensor in the muffler better than in the y-pipe

    • Member since
      July, 2005
    Posted by dyna-tek racing on Friday, May 15, 2009 7:06 AM

    Not good to put the A/F sensor in the ypipe it wouldnt survive long. EGT probes can go in the y pipe with no issues.

    master mechanic-outboard,sterndrive,pwc,snowmobile. dynamometer facility -crank repair -cylinder repair-trail and race motors-shock service clutch machining and balancing. complete racer support- free technical support-racer discount programs Todd Guthrie 1-260-316-2839 or like us on face book and keep up to date on monthly specials using our facebook page.See new innovative product as soon as it gets built

    • Member since
      October, 2005
    • From: Race Central
    Posted by Iceman 700 on Monday, May 18, 2009 6:51 PM

    Experts

    We don't really use an air/fuel ratio gauge when tuning in a snowmobile. We prefer to use EGT gauges and tune off of exhaust gas temperatures. We only use air/fuel ratio gauges to tune in 4-stroke machines. On a 4-stroke you want your air /fuel ratio to be between 12.8 - 13.2.


    Thanks,

    Larry Houle
    SPEEDWERX, INC.

    So if you are really rich and have some raw fuel in the pipe and it hits the hot charge doesnt that show high temp on the egt's? So what would you do in that case?

      ISR- Idiots Shouldn't Rule. There is a very fine line between "hobby" and "mental illness" Yamaha rocks.......Fastest 1000 in the 600 stock class. Living life in the fast lane....1000 feet at a time.

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    • Member since
      July, 2005
    • From: Waukesha, WI
    Posted by AmSnow on Wednesday, May 20, 2009 3:45 PM

    What your saying can happen but it would depend on egt temp and your jetting would have to be way off.

    You should contact your motor builder or exhaust builder to get the proper specs.

    For more information call us at

     

    651.982.6020

    -Jeremy Houle

    Speedwerx
     

    • Member since
      July, 2005
    • From: Menno, SD
    Posted by Srxspec on Wednesday, May 20, 2009 7:48 PM

    You should never solely rely on your EGT gauge or your Air/Fuel Ratio gauge without establishing a baseline setting with good safe spark plug reading & piston wash reading.  Check what your EGT gauge or Air/Fuel Ratio gauge is after you establish a baseline and then use that to fine tune your setup further.

    Allen Ulmer
    Ulmer Racing
    605-387-2833

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