Yamaha TTR 125, XT125 , Rear Sprocket 54 Tooth 428 Chain, 4 bolt sku 7539

 Purchased from an old line Yamaha dealer that went out of business.  Marked YA17  This was probably a dealer "take off" for a sprocket switch.  You can see that it was mounted, however the teeth show no wear.  4 bolt mounting at 2 1/4" on center.

Please count  your number of sprocket teeth, and check your bolt pattern distances and center opening 

These sprockets are new and within +- 2 teeth of specified OEM sprocket sizes from Reputable Sprocket Charts.    larger  number of teeth give you faster acceleration.  smaller number of teeth give you more top speed.

Email me with any questions as products are not returnable