Jump to content
NoBs

2019 Yamaha XT 250 gearing

Recommended Posts

 

   New owner here, first ride today.  Tried a couple of hills today and had some issues between 1st and 2nd while going up a few decent hills.  First was too low and second wanted to bog.  Who has dropped a tooth or two in the counter shaft sprocket to help with this and what kind of results did you notice  ?  Pretty sure this probably has been addressed before but I don't know where or how to look.  

Share this post


Link to post
Share on other sites

Counter shaft?

Do you mean output shaft? I would count off the teeth on the sprockets you have. Often as not people up gear off road type bikes thinking they will get some more road speed.

There are also limits to what that little 250 is good for. its not a massive leap from the 125, maybe 8hp. You may have to settle for what you have on the 'big' hills.

Share this post


Link to post
Share on other sites
On 3/14/2020 at 1:32 PM, Cynic said:

Counter shaft?

Do you mean output shaft? I would count off the teeth on the sprockets you have. Often as not people up gear off road type bikes thinking they will get some more road speed.

There are also limits to what that little 250 is good for. its not a massive leap from the 125, maybe 8hp. You may have to settle for what you have on the 'big' hills.

I've only ever known it as a counter shaft sprocket but output shaft works as well. ..  I'm in the USA so our ways of describing it may be different.  Perhaps you folks  have less terrain where a little more oomph is useful while going up steeper hills. Here in the States there's a lot, especially in the Eastern and Western parts.  Have to disagree with " settling "  with what you have.  A tooth or two less on  the counter shaft  makes a world of difference in pulling power up steep terrain.  While the HP is unchanged the pulling power is increased dramatically.  Obviously, it's easier to go uphill no matter what the terrain.  Common practice here in the States..  Some guys also increase the teeth on the rear sprocket as well.  If one lives on flat ground area, you might go the other way ( less output shaft teeth ) for more speed..  but for me, I wouldn't have bought the dual purpose XT 250 if that were the case..

***  guess I should have stated in the beginning I'm mainly talking dirt bike riding hills, some fairly aggressive in soft dirt, not street hills.  Even so, the principle works the same.  

Share this post


Link to post
Share on other sites

I dropped a tooth off the front sprocket on my DT. Pulls much nicer now, especially on those pesky hills.

I think cynic is trying to say that someone may have already changed the gearing from stock. 

For the cost of a front sprocket, it's definitely worth a try. 1 tooth on the front is probably equivalent to 4 or 5 on the rear. You can use  https://www.gearingcommander.com/ to calculate your ratios if you like.

  • Like 1

Share this post


Link to post
Share on other sites

Yip.. go down 2  if offroad . as top speed  not important,, 

Share this post


Link to post
Share on other sites

Yes I was saying, obviously badly, that a previous owner may have messed with it already thinking it would do a zillion miles an hour with different gearing and as the 250 has little spare (for 70mph road work) horsepower it hurts.

From my off road riding you can benefit from fitting a big front sprocket and a big rear, you keep a broadly similar final drive ratio but the relationship between the sprocket and the wheel means its easier for the gear to turn the wheel. Its not a massive benefit but it all helps.

We have just the same lumpy ground in the uk, I used to find that letting the wheel spin up was normally the best option, not so much for people close behind. but hey.

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


×
×
  • Create New...