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Thread: Sprocket Change

  1. #1
    On the Road
    Join Date
    Oct 2010
    Location
    Lower Michigan
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    16

    Sprocket Change

    I just changed the countershaft sprocket on my 2010 F650GS. I added a tooth. The only place I could find an 18 tooth sprocket was Tourtech. I have put about 500 miles on since changing it, and I have dropped about 500 rpm. When I added the Tourtech saddle bags, I gave up several miles per gallon. Their boxes hang out on the side like mini walls. I am pleased to report interstate mileage has increased 4 miles a gallon. I have not noticed any struggle to take off from a stop. Now if I could find a 38 tooth rear sprocket.........

    Randy

  2. #2
    Registered User
    Join Date
    Aug 2008
    Location
    North Carolina
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    195
    Wow ... I'm impressed.
    Thanks for sharing the results of the experiment!

  3. #3
    Registered User andreb's Avatar
    Join Date
    Jun 2009
    Location
    De Forest, WI
    Posts
    60

    I Did It On My F800GS

    I changed my front sprocket from the standard 16 to a 17 tooth unit. My mileage went up by about 5 mpg, and the engine is much smoother. It is now in a more relaxed rpm portion. It hurts a bit a slow speeds, but the trade off is worth it, especially if one does a lot of highway miles.
    Andre Boening
    2010 F800GS and 2012 K1600GT

  4. #4
    Unfunded content provider tommcgee's Avatar
    Join Date
    Dec 2006
    Location
    Braintree, MA
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    3,090
    You are trading for lower revs at highway speed when you go up a tooth in the front. The price is reduced torque. Personally, I don't like this trade off.

    Mpg figures are suspect, depends where the odo gets the feed. Use gps rather than the bike gauges to calculate mpg.
    Salty Fog Rally 2007, 2009, 2011, 2012, AND LOOKING FORWARD TO 2014!

    -Tom (KA1TOX)

  5. #5
    On the Road
    Join Date
    Oct 2010
    Location
    Lower Michigan
    Posts
    16

    sprocket

    My mileage increase is off my GPS, not the odometer.

    Thanks
    Randy

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