real quick gearing ?? woods setup


8 replies to this topic
  • ThumperKid250F

Posted February 17, 2009 - 06:46 PM

#1

ok i got a 2006 yz 450 and im getting it ready for the woods. i got a really strong motor with a ton of bottem and midrang power so i no that the stock gearing is going to not work in the tight stuff.. so my question is would a

14-50 or a 14-49 = 13- 52

if any of this makes sense.


also what gearing do you guys think would be the best for the tight stuff mixed with open stuff..

im lost on gearing here guys help me out..

  • grayracer513

Posted February 17, 2009 - 08:41 PM

#2

.. so my question is would a

14-50 or a 14-49 = 13- 52

No. 14/50 or 14/49 are higher than stock, 13/52 is lower. Simple math; Divide the larger by the smaller to find the ratio:

  • 49/13=3.77:1 (stock)
  • 52/13=4.00:1
  • 49/14=3.50:1
  • 50/14=3.57:1

I use the stock 49/13 or a 48/13 for desert racing, and it handles the tight stuff OK. If there were more tight areas and less high speed involved, then a 51/13 might be a choice.

Remember, when gearing lower for the slow sections, you always loose more speed on top than the low speed performance you gain on the bottom.

  • WR450FGreg

Posted February 18, 2009 - 01:43 AM

#3

.
The rule of thumb at the track has always been:

[COLOR="Red"]1 tooth on the countershaft sprocket = (roughly) 3 teeth on the rear sprocket[/COLOR]

So, for example 13/48 (3.692:1) gearing is close enough to 14/51 (3.643:1)

or

14/50 (3.571:1) is about the same as 15/53 (3.533:1)

or

13/52 (4.000:1) is similar to 14/55 (3.929:1)

........... and so on.

Greg

  • ThumperKid250F

Posted February 18, 2009 - 08:26 AM

#4

yea i got a lot of tight stuff here with some open. i just dont want to be stalling a lot in the tight stuff like my buddy with his stock gearing..

i think ill try a13- 51 first and see how that does..

thanks guys

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  • travisn

Posted February 19, 2009 - 07:16 AM

#5

I have been thinking about gearing. Esp with these motors being so high comp and (relatively) hard to start, gearing it down will be good. Therefore it will jst chug through the slow stuff instead of stall. I don't see running out of gear at the top end to be a problem for most situations.

  • steam

Posted February 19, 2009 - 07:43 AM

#6

I'm running 13/51 up here in British Columbia where we have a mixture of tight woods and wide open spaces. That gearing combo seems to be the ticket, your able to keep your bike in 2nd gear in the tight stuff and 5th gear still rolls your eyes back!

  • ThumperKid250F

Posted February 20, 2009 - 07:06 AM

#7

thanks guys, im gunna try the 51 in the back and see how it goes:thumbsup:

  • hillclimbguy

Posted February 20, 2009 - 07:40 AM

#8

13-53 or 13-54 you'll have to modify your chain guide slightly so the chain and sprocket roll easier.

  • ThumperKid250F

Posted February 20, 2009 - 07:47 AM

#9

13-53 or 13-54 you'll have to modify your chain guide slightly so the chain and sprocket roll easier.


thanks ill keep that in mind if i go that big:thumbsup:





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