LockedYamaha ATV Horsepower and Gearing Chart

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J_Fred
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2013/02/13 13:51:14 (permalink)

Yamaha ATV Horsepower and Gearing Chart


Gearing and Horsepower numbers are a good indicator of how well your ATV can handle certain tire sizes.  However, gearing and HP aren't everything.   The following information was compiled on my own accord unless otherwise stated, and could contain errors.  If anyone finds any errors, send me a PM and I can update/change as needed. The EPA/carb readings may be a bit off, but most manufacturer statements are usually at or below the EPA read outs.  So at best the EPA readings may be a bit higher than actuality.  This is horsepower at the crank, not rwhp.  To find HP ratings for different models, simply change the "/2013/2013.php" at the end of the site to your desired year.  If you are looking for a 2006 Honda Foreman 500, then you would input "/2006/2006.php" at the end of the url, and find the 475cc Honda ATV engine listing.  You'll have to know/guess your engine displacement if you don't know it already.  There are many makes and models of ATVs included in this... from Arctic Cat to Yamaha.     

I've included most of the popular models.  If there are any errors, then let me know and I'll update the chart.  This is from the most up to date models I have available (most up to 2013 unless otherwise stated).  I've round HP up to the nearest half, and ratio to the nearest tenth.  The ratio given is the lowest possible for the model in question (usually in 1st gear and/or low range).  

The following gearing information is thanks to user Live_For_Mud.  I was able to save some of his posts that have been lost in the forum.  Horsepower information can be found on the EPA emissions website : http://www.arb.ca.gov/msp...v_comply/2013/2013.php
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Timberwolf 250 4x4   15 HP
Primary Reduction: 3.318 
Secondary Reduction: 1.176 
Final: 4.18 (46/11) 

Gear   Ratio    (Total Reduction) 
1st:   2.833           (46.207) 


Wolverine 350 Manual  - 22 HP
Primary Reduction: 3.167 (76/24) 
Secondary: 1.143 (24/28 x 24/18) 
Final: 3.67 (33/9) 

Gear       Ratio         (Total Reduction) 
1st:   38/13 = 2.923        (38.831) 


Big Bear 350  - 20 HP
97-99 single range 5 speed: 
Primary reduction: 3.167 (76/24) 
Secondary reduction: 1.440 (27/25 x 24/18) 
Final Drive: 33/9 (3.67) 

Gear        Ratio         (Total Reduction) 
1st    38/13 = 2.923       (48.92) 


93-98 kodiak 400 and BB Pro    - 22 HP
Primary reduction: 3.166 (76/24) 
Secondary reduction: 1.333 (24/18) 
Final Drive: 3.67 (33/9) 

Gear Ratios                (Total Reduction) 

Low Range [1.483:1]: 
1st  = 4.334                   (67.133) 



Big Bear 400    - 23 HP
99-current single range 5 speed: 
Primary reduction: 76/24 (3.166) 
Secondary reduction: 28/24 x 24/18 (1.556) 
Final Drive: 33/9 (3.67) 

Gear        Ratio        (Total Reduction) 
1st    40/12 = 3.333       (60.18) 



Kodiak/Grizzly 450  - 26 HP
Primary (V-belt):  (2.55 - 0.75) 
Secondary: 2.166 (39/24 x 24/18) 
Final Drive: 3.67 (33/9) 

Range    Reduction      (Total Reduction) 
High:      1.652              33.465
Low:       2.813             56.984 
Rev:       1.706              34.559

Grizzly 660/700
    660 -  41 HP    700 - 46 HP
Primary (V-belt):  2.380 - 0.700 
Secondary reduction: 2.603 (41/21 x 24/18) 
Final Drive: 3.67 (33/9) 

Range    Reduction       (Total Reduction) 
High:         1.16            26.349
Low:         1.938          44.021 
Rev:          2.000          45.429

Grizzly 350  - 22 HP

Range          Reduction          Total
Forward         1.75                41.76
 
Grizzly 550    -  37 HP
 
Range          Reduction          Total
Low               1.938              46.24
 

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1:  The higher the number, the lower the gear.   
post edited by J_Fred - 2013/02/13 14:10:41

"I don't get stuck, I just lose traction and stop moving."
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Arctic Cat 650 V2
31 Outlaws, VFJ Stage II Primary
Teryx Gear Reduction with 4.0 Differentials
1.5 inch MTI lift and Arched Arms
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RZR 800 
31 Outlaws, Highlifter Lift
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