This is a 1″ outside diameter, 5/8″ inside diameter adapter bushing and hardware for installing a Comet 20 or 30 driver clutch on a Rokon Power Bee 820 crankshaft. The Comet 30 works on 1963 to 1973 Albion transmission equipped bikes and the Comet 20 works on Automatic and Plunger gearbox bikes starting with the 1974 model year. You will also need a matching driven clutch and belt.
I have replaced the centrifugal clutches on several older Albion equipped bikes with Comet 30 torque converter setups and am pleased with their performance. The Comet 30 will increase the bikes top end while retaining the low end torque. Here’s the downside. The Albion kick starter will no longer function and you will have to rev the engine a little to engage the torque converter when going down steep hills or it will freewheel. This is because there is no one way bearing in the Comet setup. The Comet 30 operates the same way as the Salsbury 330 torque converters on the newer bikes.
I suggest adding a rear brake with a Comet 30 installation.