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Thread: Larger Rear Sprocket on DCT

  1. #1
    Junior Member
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    Larger Rear Sprocket on DCT

    I accidentally ordered Chain and Sprockets for the non DCT version. When I got them in and checked the book.....OOPS. So I thought about it and then found a post in here where someone else had done the same and installed the larger rear sprocket and liked the results, so I thought why not try it. Dang if I don't love it.
    I have a 2012 DCT and I have not liked the Drive setting as it lugs too much. Now it only barely lugs. And the Sport setting is now Super Sport. I also have more spunk off the line and acceleration is improved. I am running 60mph at 3000 rpm and 80 at apx. 3100 rpm. Also a longer chain with a larger sprocket should last longer. Only downside I see is it may cost me some MPG.

    I see no reason why the DCT did not come with the same chain and sprockets as the standard version does.

    IMHO Spike out
    Last edited by Sandspike; 17th October 2018 at 07:15.

  2. #2
    Senior Member Larger Rear Sprocket on DCT
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    How far off is the speedo? Doesn't the DCT get speed fro the counter sprocket?
    "Roads are just a suggestion, like pants."

  3. #3
    Senior Member Larger Rear Sprocket on DCT davidc83's Avatar
    Bike: Suzuki C50; 2009 klx250sf; 2013 Nc700
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    Quote Originally Posted by Doc True View Post
    How far off is the speedo? Doesn't the DCT get speed fro the counter sprocket?
    Believe there is a sensor within the transmission on the Nc700/nc750 for speed-similar to cars.
    [SIGPIC][/SIGPIC]

  4. #4
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    Speedo could be off. Have not checked yet with GPS. Will report when done.

  5. #5
    Member dreamer's Avatar
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    For speedometer calibration this is usualy used:

    SpeedoHealer v4 Full kit - HealTech Electronics Ltd.

  6. #6
    Super Moderator Larger Rear Sprocket on DCT 670cc's Avatar
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    The internal transmission gear ratios are slightly different on DCT vs manual. The final drive gearing difference (39 vs 43 rear) compensates and makes the overall gearing for the two models very close to the same.

    The actual speedometer accuracy would have been affected by your sprocket swap. Your speedometer vs tach reading would not have changed since the bike doesn’t know you put a different sprocket on back.
    Greg
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  7. #7
    Senior Member Larger Rear Sprocket on DCT Nofear2trek's Avatar
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    Quote Originally Posted by 670cc View Post
    The internal transmission gear ratios are slightly different on DCT vs manual. The final drive gearing difference (39 vs 43 rear) compensates and makes the overall gearing for the two models very close to the same.

    The actual speedometer accuracy would have been affected by your sprocket swap. Your speedometer vs tach reading would not have changed since the bike doesnít know you put a different sprocket on back.
    Yep, Greg. Iíve been enjoying use of 16/41 sprockets on my DCTís for years and absorb the poorer gas mileage.

    Ray

    Life is Wonderful, if it isn't you may be doing it Wrong!

    18 centuries of the choice, 'believe this way or die', & always chosen life, is a lineage difficult to separate from. I understand. But do not fear my belief science created the universe, I'll never say "Big Bang's Will" made me do you harm. We are a genuinely free & peaceful lot.

  8. #8
    Junior Member
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    GPS 40 reads 42 and GPS 70 reads 75 on Speado... But I can live with it and adjust. Might just keep me from getting a ticket or two.

  9. #9
    Senior Member DCTFAN's Avatar
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    Doesn't the ABS work less efficiently?
    It seems it kicks in a bit late which can cause the rear tire to start sliding/skidding a bit.
    I've gone from 42T to 44T rear sprocket due to smaller than OE wheels (17" from OE 18")
    The extra 2T corrects the speedo error caused by the smaller wheel size,
    but the change in ABS and TC made me nervous.
    The solution provided by RallyRaid is a modified ABS ring for the rear tire to make the ECU happy.

  10. #10
    Member
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    I went 1 tooth down on the front and it made a significant difference in performance and being able to wind out 6th gear. I believe I tried to go 2 teeth and the computer was all confused and shifting was all off.

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