4 Pocket Bike Dirtbike Dirt Bike B1 Replica 39cc Chain Adjuster Tensioner 49cc - PetrolScooter - 28909

These chain adjusters are designed for a 10mm axle. It is important to measure your bike's rear axle to confirm compatibility before purchase.

They are intended for 39cc and 49cc Mini Moto pocket bikes and dirt bikes. However, the primary compatibility factor is the 10mm axle size.

You may need new adjusters if your current ones are damaged, rusted, or if you cannot achieve proper chain tension with them. They are also a good replacement when installing a new chain or sprockets.

Generally, there should be about 1/2 inch to 3/4 inch of up-and-down play in the chain. Consult your bike's manual for specific recommendations, as this can vary.

This pack includes four (4) chain adjuster tensioners.

While primarily marketed for Mini Moto, if your 4-stroke dirt bike has a 39cc or 49cc engine and a 10mm rear axle, they may be compatible. Always verify your axle size.

Verify that the adjuster is correctly seated and tightened against the swingarm. Ensure the axle is properly aligned. If the adjuster has reached its limit, you may need a longer chain or a different sized adjuster.

Back off the adjuster by turning it counter-clockwise. Ensure the chain has the recommended slack. Over-tightening can damage components.

Double-check that your bike's rear axle is indeed 10mm. These adjusters are specifically for 10mm axles. If your axle is a different size, these will not fit.

This could indicate worn sprockets or an excessively worn chain. Inspect sprockets for hooked teeth and the chain for damaged links. Replace worn components as needed.