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    gearing cbr600 with pilot fnr
    #1
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    Can anybody confirm my calcs, honda cbr600 primary ratio; 1.775. 6th gear ratio; 1.130. pilot fnr 9.8>1 , 22dia tyres. chain reduction 1.5>1.
    12000 rpm/1.775/1.130/9.8/1.5. = 406.993
    406.993 x 60 x 3.142 x 69.124 / 63360 = 83.70mph.
    just trying to see if im on the right track for final mods to an existing build.
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    Re: gearing cbr600 with pilot fnr
    #2
    Member
    Join Date
    Jan 2010
    Location
    Ontario Canada
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    Here's what I get.

    At 12000 engine rpm , in 6th gear your front sprocket will be turning 5983rpm.

    With a 22" tall tire, and a 9.8:1 reduction, the input shaft of the tranny needs to see
    8977 for 60mph.

    That means you have to step up the rpm at the sprockets 1.5 , not reduce.
    And that's to get to 60mph. 2.1 step up to get to 85mph.
    What's the biggest front sprocket that you fit on a CBR600?

    I have a KLX650 motor and a 10:1 Odyssey FNR box. I used a jackshaft and double chain set-up to make it work. The short chains need maintenance after every ride, and have a short lifespan. Try and get your chains as long as possible.
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    Re: gearing cbr600 with pilot fnr
    #3
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    Thanks DaveM, i must have my head stuck some where dark !, in regards front sprocket sizes im not sure but 17 is the biggest, unless special and then not sure if have enough clearance, im just trying to get a reverse gear, as i have a pilot fnr box sat in the shed, anybody changed gear sizes or anything similar with these, might just go to a spool, what size sprockets with same tyres/engine configuration,
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    Re: gearing cbr600 with pilot fnr
    #4
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    Quote Originally Posted by DaveM View Post
    Here's what I get.

    At 12000 engine rpm , in 6th gear your front sprocket will be turning 5983rpm.

    With a 22" tall tire, and a 9.8:1 reduction, the input shaft of the tranny needs to see
    8977 for 60mph.

    That means you have to step up the rpm at the sprockets 1.5 , not reduce.
    And that's to get to 60mph. 2.1 step up to get to 85mph.
    What's the biggest front sprocket that you fit on a CBR600?

    I have a KLX650 motor and a 10:1 Odyssey FNR box. I used a jackshaft and double chain set-up to make it work. The short chains need maintenance after every ride, and have a short lifespan. Try and get your chains as long as possible.
    I am tryin to figure mph also, I have the number you referance could you post formula you use to get mph Thanks
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    Re: gearing cbr600 with pilot fnr
    #5
    Millenium Member Deranged's Avatar
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    Sep 2008
    Location
    Allendale MI
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    2,048
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    I came up with 197 MPH.

    Justin
    Nowhere near the desert.
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    Re: gearing cbr600 with pilot fnr
    #6
    Super Moderator minibajaman's Avatar
    Join Date
    Oct 2006
    Location
    Pittsburgh, PA
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    1,841
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    Pilot / Odyssey gearboxes are not good choices to use with motorcycle engines due to their gear ratio being about twice as low as what you need.

    How about something like this?

    https://www.minibuggy.net/forum/minib...erse-like.html
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    Re: gearing cbr600 with pilot fnr
    #7
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    Quote Originally Posted by GateKeeper View Post
    I am tryin to figure mph also, I have the number you referance could you post formula you use to get mph Thanks
    Nevermind I just found a calculator..........Interactive RPM and MPH Computator Program
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    Re: gearing cbr600 with pilot fnr
    #8
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    Ok, pilot fnr a no go as standard, anybody changed the gears inside, just an idea, if not, any clues at what gear reduction, same engine same primary gear, 1.775. 6th gear, 1.130. 22" dia tyres, hopeing to achieve 85mph when flat out. vehicle only weighs 700 lbs dry.
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