gearing question

[oldschooldoo]

hey guys i just bought a belt drive (easier to turn or so they say) and it is a 32/62 combo which is about 1.94 it also came with a titanium drive shaft with 10t drivers, a stock king cat is 19/43 which is 2.26 with 8t drivers, the gear ratios and adding the ratios of the drivers confuses me, any advice will be awesome... options are a leave it alone
a lleave it how it is
b put the 8t drivers on
c leave the 10t and get a top gear made
d put the 8t on and get a top gear made,

any help at all specially if you know how to add in the driver tooth factor in the drive

 

[2zeros]

More info needed!

I would suggest getting in the 2.3-2.4:1 range. But without knowing what sled you are putting it on, or where and what kind of riding you are doing? God only knows a good setup. I looked into a CMX setup but I couldnt get it geared the way I wanted to, so I lost interest. Good Luck! Post pics and tell us your results after you get it dialed. -00's

Oh, multiply the number of teeth by the pitch to get the rollout or circumferance.
8 tooth X 3.0 pitch = 24 inches of rollout
10 tooth X 2.52 pitch = 25.2 inches ect.

 

[vdo1948]

I think 00s left out the math you need. I think somewhere on here there is a formula for this but I look at it based on roll out for one revolution of the jackshaft (upper gear). So, I assume from your post you are on a King Cat with a 3.0 pitch track and if you assume the 2.3 (20/46 tooth gearing) that 00s said to aim for, you use the inverse ratio times the full rollout (one rev of the drivers). So the formula for a chain driven King would be:
(# upper teeth / # lower teeth) * (# driver teeth * pitch). For our example:
(20/46)*(8*3.0)= .43478*24 = 10.43478 inches you travel in one revolution of the jackshaft.
With your set up as you bought it:
(32/62)*(10*3.0) = 15.4839 or half again as far, so that is geared quite high. Your goal would be to solve the equation for an X (number of driver teeth or number of upper or lower gear teeth) that gets you close or maybe slightly under 10.43478 inches. If you stick with an 8 tooth driver and want to go with a bigger lower belt drive gear:
(32/x)*(8*3.0) = 10.43478
32/x * 24 = 10.43478
768/x = 10.43478
x = 768/10.43478
x = 73.6 teeth
So you would need a 32 tooth upper gear and a 74 tooth lower gear with 8 tooth drivers to be in the "2.3" ratio range.

Hope this makes some smese and isn't too much math. There may be an easier way.

 

[oldschooldoo]

Thanks, now it's time to try and find a sproket..... I think I will try to get a 26 or 27 top one because I think it will be cheaper if I do it that way, anyone know of anywhere that has something likethis let me know please!!!!

 

[oldschooldoo]

Hey how about this the 32/62 gearing and then run a 7t 3.0 driver so that would be
32/62=.516*(7x3)=10.383"per Jack shaft rotation....

What are the cons of running a smaller driver? Thanks!!!!!

 

[oldschooldoo]

So I read the negitive on smaller drivers is you have to run the track tighter, also it takes more power to turn, so basically a 8t has a 7.64" dia and a 7t would have a 6.68" dia so my question is would you really notice that.? If anyone who has ran differnt drivers could chime in that would be awesome

 

[2zeros]

Gear ratio calculater

SLP has a great formula for calculating all of this, on their website. I printed copies and do a solution every time I make a clutch or gear change. I think you are on the right track, but I would stay away from the small drivers. It was almost impossible to get what I wanted. Keep us posted!

 

[oldschooldoo]

so i called up crazy mountain extream and he said i was crazy going anything lower then 2.14 he also said a 900 with porting, bored carbs, twins, head, and timing key should easily turn a 162 with that gearing. he said it all has to do with clutching so you can actually get more trackspeed... now im confused as hell.... good news i got ahold of white liteing bad news the smallest top gear is a 30 and 62 is the largest bottom gear, so
30/62=87.9mph @8000rpm
19/43=80.3mph @8000rpm

im looking for a 68 bottom but its really hard its basically a charger pulley in 8mm gt pitch which is easy to find but its a center flange which is almost imposible

if i was to clutch for this setup i would need a really sttep helix like a 60* and a heavy spring correct? im sorry i really know jack about clutching

 

[Mountain Thunder]

so i called up crazy mountain extream and he said i was crazy going anything lower then 2.14 he also said a 900 with porting, bored carbs, twins, head, and timing key should easily turn a 162 with that gearing. he said it all has to do with clutching so you can actually get more trackspeed... now im confused as hell.... good news i got ahold of white liteing bad news the smallest top gear is a 30 and 62 is the largest bottom gear, so
30/62=87.9mph @8000rpm
19/43=80.3mph @8000rpm

im looking for a 68 bottom but its really hard its basically a charger pulley in 8mm gt pitch which is easy to find but its a center flange which is almost imposible

if i was to clutch for this setup i would need a really sttep helix like a 60* and a heavy spring correct? im sorry i really know jack about clutching

I could agree with CMX on some applications, Took my 02 TC MC 162" gearing from 2.28 (previous owner gearing) to 2.10 - Much better pull,track speed,acceleration,topspeed, best of all more miles to the tank and clutches never get more than warm( O blown belts). With the torque of the cat 900 I would think gearing in that range would work.

 

[oldschooldoo]

finally found a 72t center!!!! so i will have the options of

32/62=1.93=93.84mph
30/62=2.06=87.97mph
32/72=2.25=80.80mph
30/72=2.40=75.75mph

stock 19/43=2.26=80.33mph
20/46=2.3=79.05

cool thing is i can change cears and run differnt ones in about 10min!!!!!
keep you guys posted!!!!