Picture of Yamaha YZ 80 H 81 Sprocket Rear Plus 1 Tooth - JT (Check Chain Length)
  • YAMAHA YZ 80 H 81

  • Sprocket Rear Plus 1 Tooth - JT (Check Chain Length)

  • £13.31
  • STOCK STATUS: In Stock
  • All prices are in British Pound (GBP) and include VAT at 20% where applicable. VAT will be deducted at the checkout for goods supplied to outside the European Union.

  • Yamaha YZ 80 H 81 Full Parts List

Part Description

Yamaha YZ 80 H 81 Sprocket Rear Plus 1 Tooth - JT (Check Chain Length)

JT Sprockets

JT Logo

Rear Sprocket

JT are the leading manufacturer of aftermarket motorcycle sprockets, with the largest and most advanced factory in the world.

Motorcycle Sprockets made the right way...

There's only one way to make a sprocket that meets the highest quality standards and thats hobbing, machining and drilling. This gives the closest tolerances and most accurate tooth profiles.

...with the right materials...

By sourcing the best quality raw materials for their motorcycle sprockets, JT can ensure the best quality end product.

JT are the only manufacturer to use ultra-durable high carbon C49 steel for their motorcycle sprockets. This is a higher carbon steel than the typical C45 steel used by other manufacturers (including original equipment manufacturers) and so is harder and stronger than many other sprockets on the market.

...to meet or exceed the highest quality standards

Each JT sprocket goes through 10 individual quality control checks before leaving the factory to ensure that it meets or exceeds the highest quality standards for the motorcycle industry. And a good quality sprocket means less wear on the drive chain.

45 Teeth

Delivery and Returns

We want you to be happy with your purchase. If you're not, just return the products to our warehouse. Unless faulty, we'd like this to be within 30 days of purchase. Exceptions apply to certain products.

Read our full returns policies


In theory increasing the number of teeth on the front sprocket and/or decreasing the number of teeth on the rear sprocket you will result in higher top speed, lower acceleration and better fuel economy. And vice versa: decreasing the number of teeth on the front sprocket and/or increasing the number of teeth on the rear sprocket will result in lower top speed, higher acceleration and worse fuel economy. However whilst generally true in practice this is not allways the case, mostly due to the power output of the machine at certain revs being higher or lower than at others. So use the following table as a guide only, to achieve your desired result will often involve some trial and error. It should also be noted that some models cannot accommodate larger front sprockets: check before ordering. Often the fitting of larger sprockets may require a longer chain: check before ordering.

... Read more » Sprocket Gear Ratios

Sunstar Sprockets
"...The sprocket your bike would choose..."
Sunstar Sprocket
  • High stock levels held within the UK for swift delivery.
  • A tough, durable, long lasting sprocket.
  • Formed of the best quality Japanese-sourced materials.
  • Made with the latest sprocket manufacturing technology.
  • A longer lasting sprocket means a longer lasting chain.

Japanese company Sunstar are the largest manufacturer of OE sprockets in the world and since 1946 have supplied their top quality steel sprockets to the likes of Honda, Kawasaki, Suzuki, Yamaha and Triumph and more.

sunstar heat treated teeth;

It's a combination of high-grade, high-carbon steel, and a heat treatment and quenching process unique to Sunstar, that makes Sunstar one of the strongest, most durable and longest lasting sprockets in the world. And a harder wearing sprocket means a longer lasting chain.

The first choice of most major manufacturers, more bikes leave the showroom with a Sunstar sprocket than any other make. Now Sunstar is available in the UK for a wide range of models from Wemoto

Sunstar Sprockets


Supplying quality after market motorcycle parts direct to the trade