45T - Rear Sprocket - Yamaha

Marsoni

M251S

$69.95

Get it in 3 business days with 1 day shipping. Friday, May 29

45T - Rear Sprocket - YamahaMTX SPROCKETS Steel sprockets are strong and durable, heat treated and hand finished for longevity. Designed as an OEM replacement to exceed OEM specifications at a fraction of the price, making them your ideal cost effective solution for replacing old worn and warped sprockets. OEM replacement Exceeds OEM specifications Heat treated and hand finished Note: Image for reference only product may vary slightly for fitment

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MUCH better than the cheap plastic OEM part, Just a reminder though, these thread into an aluminum block so be very careful to start them finger tight first, then evenly tighten both bolts to push the fitting into the chamber. If you don't, it will slightly misalign and you run the risk of stripping the threads. The one comes with the replacement o ring, and be sure to get some antifreeze on that seal prior to attempting to push it into the chamber. IT IS A TIGHT FIT, but that's what you want, so just be careful. You might also want an extra hose clamp on hand, as the one that came with this began to bend as it got tight, so I had to replace it for peace of mind. Overall, great product though.

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Reviewed in the United States on January 9, 2026