Gear box sprocket upgrade with 1.75 track upgrade?

[Matthew457]

Hi, I just got a new 1.75 backcountry track for my 2012 Nytro xtx and am wondering if I should do any other upgrades to the chain case sprockets or anything else while the tracks getting swapped? Heard that I should get a smaller sprocket to give more torque to spin the larger track. What exactly would I need to get? Thank you.

 

[greatwhite89]

The 1.75 Nytro XTX came with 39/20 gearing from the factory. Your stock gearing with the 1.25 is probably higher.

 

[Matthew457]

The 1.75 Nytro XTX came with 39/20 gearing from the factory. Your stock gearing with the 1.25 is probably higher.

Ah okay thanks, so probably best option would be to put in those gears

 

[Matthew457]

The 1.75 Nytro XTX came with 39/20 gearing from the factory. Your stock gearing with the 1.25 is probably higher.

Just looked at parts catalog, says stock has

The 1.75 Nytro XTX came with 39/21 gearing from the factory. Your stock gearing with the 1.25 is probably higher.

looked at parts catalog, says stock for a 2012 Nytro xtx is 39/21, so just gotta change the top sprocket to 20T. Know what the spline is? Can’t seem to find and just don’t wanna order the wrong one, found this...

 

[1nc 2000]

https://ty4stroke.com/threads/installing-a-1-75-track-into-the-nytro.88863/

 

[Matthew457]

https://ty4stroke.com/threads/installing-a-1-75-track-into-the-nytro.88863/

Nothing about the sprockets on this

 

[1nc 2000]

Check your clearance between the front heat exchanger and track. If you sled came with a 1.25 track you may have to remove tunnel protectors or go with smaller drivers.
Or notch your 1.75 track in that area.

 

[Matthew457]

Check your clearance between the front heat exchanger and track. If you sled came with a 1.25 track you may have to remove tunnel protectors or go with smaller drivers.
Or notch your 1.75 track in that area.

Track will fit, bringing into dealer to get swapped. Just wanna make sure I’m ordering the right top sprocket