How do you calculate the gear ratio on a Honda?
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How do you calculate the gear ratio on a Honda?
Since there are different combinations of countershaft small & large, final, and driveshaft gears, how is the gear ratio calculated?
I had a friend show me how to do this about 15 years or so ago, but I don't remember anymore....
I had a friend show me how to do this about 15 years or so ago, but I don't remember anymore....
Geoff
'85 Aero 50 w/Dio 66cc
'87 Elite 50 w/Dio 72cc
'87 Spree -SOLD!
Puch Magnum
Yamaha Razz POS -Soon to be Dio powered!
'85 Aero 50 w/Dio 66cc
'87 Elite 50 w/Dio 72cc
'87 Spree -SOLD!
Puch Magnum
Yamaha Razz POS -Soon to be Dio powered!
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- CBR1000RR
- Posts: 4957
- Joined: Sun Apr 16, 2006 11:51 am
- Location: Southern Michigan
You guys know how to count teeth and do fractions, right?
10 tooth gear -> 50 tooth gear = 5:1 ratio
10 tooth gear -> 30 tooth gear = 3:1 ratio
5:1 -> 3:1 = 15:1 ratio
10 tooth gear -> 50 tooth gear = 5:1 ratio
10 tooth gear -> 30 tooth gear = 3:1 ratio
5:1 -> 3:1 = 15:1 ratio
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- CBR1000RR
- Posts: 4957
- Joined: Sun Apr 16, 2006 11:51 am
- Location: Southern Michigan
I dont pay much attention in math, some engineer i am.noiseguy wrote:You guys know how to count teeth and do fractions, right?
10 tooth gear -> 50 tooth gear = 5:1 ratio
10 tooth gear -> 30 tooth gear = 3:1 ratio
5:1 -> 3:1 = 15:1 ratio
I am not a mechanic, nor do I play one on TV. Actually my advice is probably worth slightly less than what you pay to view it.
Apparently, I'm running 6.475:1 gears in my Spree, and NOT the 7:1 like I thought.
(42/12) * (37/20) = 6.475
Thanks for the help!
My old 8.44:1 gears. Soon to be installed in a new project.
Dug up some parts in the garage recently....
(42/12) * (37/20) = 6.475
Thanks for the help!
My old 8.44:1 gears. Soon to be installed in a new project.
Dug up some parts in the garage recently....
Geoff
'85 Aero 50 w/Dio 66cc
'87 Elite 50 w/Dio 72cc
'87 Spree -SOLD!
Puch Magnum
Yamaha Razz POS -Soon to be Dio powered!
'85 Aero 50 w/Dio 66cc
'87 Elite 50 w/Dio 72cc
'87 Spree -SOLD!
Puch Magnum
Yamaha Razz POS -Soon to be Dio powered!
Unfortunately, not a whole lot. Not anymore.. A few pulleys, ramps, clutches, manifolds, drive faces, etc. A long time ago, I used to help others in tuning and installing parts on their bikes. A lot of the time, people just left or gave me the old stuff. I tossed/gave away most of it. The remaining parts I have were in a rollaway tool box, that I kind of forgot about.Dac wrote:d*** dude
what else you got?
Hey Tru72!
Am I not calculating correctly?
(42 Large counter/12 driveshaft)*(41 final/17 small counter) =
3.5 * 2.41176471
=8.4411765 ~8.44 to 1 gears
I'll have to edit my posts again if not. LOL.
Geoff
'85 Aero 50 w/Dio 66cc
'87 Elite 50 w/Dio 72cc
'87 Spree -SOLD!
Puch Magnum
Yamaha Razz POS -Soon to be Dio powered!
'85 Aero 50 w/Dio 66cc
'87 Elite 50 w/Dio 72cc
'87 Spree -SOLD!
Puch Magnum
Yamaha Razz POS -Soon to be Dio powered!
No spare S blocks right now, but I'm working on it. I do have a complete Sym engine that I just picked up.
I'll verify the (gear ratio) numbers by doing the clutch/tire turn method when I get a chance. Maybe I could attach a degree wheel to be somewhat accurate?...
I'll verify the (gear ratio) numbers by doing the clutch/tire turn method when I get a chance. Maybe I could attach a degree wheel to be somewhat accurate?...
Geoff
'85 Aero 50 w/Dio 66cc
'87 Elite 50 w/Dio 72cc
'87 Spree -SOLD!
Puch Magnum
Yamaha Razz POS -Soon to be Dio powered!
'85 Aero 50 w/Dio 66cc
'87 Elite 50 w/Dio 72cc
'87 Spree -SOLD!
Puch Magnum
Yamaha Razz POS -Soon to be Dio powered!