
Designed for replacing or adjusting the gearing, the JT Sprockets reference JTR1857.40 sprocket fits transmissions equipped with 520 pitch chains. This standard steel sprocket provides a simple and robust solution to restore your transmission or modify the character of your machine (acceleration versus top speed).
The sprocket is machined to fit common mounting points for quads and roadsters. It serves as a direct replacement part for riders looking to maintain the reliability of their final drive without complications. Ideal for applications on models such as the YAMAHA YFZ 450 R (2WD) or the YFM 700 Raptor (compatibility examples based on mounting), it allows for consistent engine behavior after replacement.
Product intended for DIY enthusiasts and workshops: check the type of mounting, hole spacing, and 520 chain compatibility before installation. Always replace the sprocket and chain according to wear to preserve the entire transmission.