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Thread: 84 R gearing for motox

  1. #1
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    84 R gearing for motox

    You guys that motox your 84 R's, do you feel with stock 13/42 gearing that it's geared right for a tighter track or too low or too high ?

    I have a ton of F & R sprockets (came with machine) and have not ridden mine much at all to tell, so what do you recommend to start out with ?

  2. #2
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    Stock gearing should be good for almost any mx track unless you are insane skilled and can push the bike to it's limits without wiping out.
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  3. #3
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    well for mx you are running a 18'' rear tire right?

    well for starters go 1 up on the front to get you back close to stock gearing....after that it all depends on the track
    80s......185 atc, Yamaha tri-moto 200, 85 200x with tons of work
    90s......89 Suzuki quad racer 250 (raced 250 A class for 6 years, late 90s.. custom framed 250x with long travel shocks and a built 350x motor.... built Honda 110
    00s...... chomeoly framed 350 RX with all the goodies (thanks to my bro)
    2012.....Replaced the 350x motor for a 444cc YZ426
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  4. #4
    Old 179's Avatar
    Old 179 is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    Quote Originally Posted by SWIGIN View Post
    well for mx you are running a 18'' rear tire right?

    well for starters go 1 up on the front to get you back close to stock gearing....after that it all depends on the track
    Need to go up two teeth to match stock gearing. Reason beings 22" tires and your dropping down two sizes in tire. On my 82 I had to go to a 15 to match stock because of the 22" tires and 13-44 gears. On the 86 they came with 20" tires so we went to a 14 with the 18" tires and stock 13-39 gears.
    Playing with numbers a 16 tooth would be closer then a 15 tooth to match stock on a 84.
    Need to ask ATCTIM. See what he runs in his.
    Start with 14 but I think you would settle for a 15

    Old 179

  5. #5
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    Quote Originally Posted by SWIGIN View Post
    well for mx you are running a 18'' rear tire right?

    well for starters go 1 up on the front to get you back close to stock gearing....after that it all depends on the track
    I completly forgot about that part of the equation and No, I have 20's on so to keep stock gearing I'd run a 14 up front or a 40 or so in rear ?

  6. #6
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    Quote Originally Posted by Old 179 View Post
    Need to go up two teeth to match stock gearing. Reason beings 22" tires and your dropping down two sizes in tire. On my 82 I had to go to a 15 to match stock because of the 22" tires and 13-44 gears. On the 86 they came with 20" tires so we went to a 14 with the 18" tires and stock 13-39 gears.
    Playing with numbers a 16 tooth would be closer then a 15 tooth to match stock on a 84.
    Need to ask ATCTIM. See what he runs in his.
    Start with 14 but I think you would settle for a 15

    Old 179
    Good info too, thank you !

  7. #7
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    I find that 20" tires with stock gearing is excellent for MX. Although - I have never played with my gearing - it just seems to work real well the way it is - I see no need to change it up. Keep in mind - these machines had 22" tires stock - so it will give you a little more low end than stock.
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  8. #8
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    Quote Originally Posted by atctim View Post
    I find that 20" tires with stock gearing is excellent for MX. Although - I have never played with my gearing - it just seems to work real well the way it is - I see no need to change it up. Keep in mind - these machines had 22" tires stock - so it will give you a little more low end than stock.
    20" tires was what you had at trike fest??? We need to talk!!!!!!!!1

  9. #9
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    yeah i forgot they came with 22'' tires
    80s......185 atc, Yamaha tri-moto 200, 85 200x with tons of work
    90s......89 Suzuki quad racer 250 (raced 250 A class for 6 years, late 90s.. custom framed 250x with long travel shocks and a built 350x motor.... built Honda 110
    00s...... chomeoly framed 350 RX with all the goodies (thanks to my bro)
    2012.....Replaced the 350x motor for a 444cc YZ426
    WWW.HREATV.COM

  10. #10
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    Im running 14/39 with 18's on my new 265 PV motor and I think its great. I MIGHT be dropping to 14/38 though
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  11. #11
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    going up one on the front is 3 1/2 on the back..

  12. #12
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    Thanks all for the info so far !

    So when you guys say you like your gearing are some of you talking 85/86 R?

    Is 1st uaseable at all or 2nd through 5th or 6th, depending on which machine ?

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