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Engine/EFI/Drivetrain Discuss engine, fuel injection, air intake, and drivetrain modifications here

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Old 05-09-2012, 07:39 AM
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one in the front is not the same at 3 in the rear.
ie: stock is 14/36 for a ratio of 2.571
dropping to 13/36 yields a ratio of 2.769 the ratio difference in dropping one tooth is .198
now look at adding 3 teeth in rear to stock to stock
14/39 = 2.786. That changed ratio .214. So 3 teeth in rear to one in front is much more of a change. now add 2 teeth to rear 14/38 = 2.714 ratio change of .143
so, adding teeth in the rear as compared to dropping one in the front is in between 2 and 3. Looks like 2.5 teeth without going any further with it.

Best thing to do is simply lay out a table in excell. Internal gearing stays same, primary drive stays same. So all that's left is finding the right ratio. Here is an example.
ratio.jpg


If you use the calculator Shady posted. Gear Ratio Calculator Then the ratio is the number you put in the calculator for ring and pinion. If all you want is to see top speed vs torque, put 2.602 in the 4'th gear column (which is really 5'th gear on your quad) and input the different ratios from gearing combo's into ring/pinion. The more top speed you have, the less torque you have througout the band.. the lower the top speeed you have, the more torque you will have within the power band. I used it for what i'm considering this year at the dunes. 15/40. that is a 2.667 ratio which is close to 13/35 I ran last year but it takes stress off the primary drive.

Hope that helps


2007 LT-R450 -
500cc BB kit @ 12.5:1 - CP Piston
+2 Ti Valves w/Newen Countour Valve Job
HD Springs
Williams Performance custom grind race Cams (both)
Port/Polish by Williams Performance
HMF Full Exhaust
Fuel Intake
FCR-41 Carb with Dial-A-Jat and Innovate LM-2 Tuner.


1995 RM 250
Rips like a chainsaw
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Last edited by Jaydoggg; 05-09-2012 at 07:45 AM.
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  #42 (permalink)  
Old 06-18-2012, 11:22 AM
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I have found gear calculator on cargister site and i thought it was a pretty good tool.
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Old 10-07-2012, 01:50 PM
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Anybody have the quad calculator that could email it to me? Lost it when my old laptop died and the link here is dead.


06 LTR- race quad
09 KTM 505sx- trail/duner/back up racer
09 YFZ450R- wife's
05 Blaster- daughter's
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Old 10-21-2012, 10:55 AM
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I hate to revive an old thread, but is it necessary or suggested that both sprockets be changed? I'm just looking for a bit more torque/ low end for hill drags in the dunes. My bike has a big bore, yoshi exhaust, cherry bomb and air box removal.I don't mind sacrificing top speed for torque since im doing for hill climbs than flats. Thanks.
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Old 12-03-2012, 04:17 PM
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Old 12-03-2012, 04:17 PM
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Old 12-03-2012, 04:18 PM
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does this help any one
http://www.12oclocklabs.com/gearcalc.htm
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Old 10-25-2013, 01:25 PM
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Hi all
Just a gearing question
I'm trying to work out what front and rear sprocket to run
Bike currently big bore port pol hi comp cams
All riding done on sand
And looking for good top end at the moment it seem to just rev out real quick and loses legs
13/37 is what it has now
Any info will be great
Kind regards
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