Missed part 1 of Chain and Sprockets? Click here. With the old chain taken off and consigned to the trash, Trent and Pete remove and examine the old sprockets, install the new ones and rivet the fresh chain in place on Pete’s KTM 950 Adventure.
Along the way, Trent discusses correct chain tension, the different ways a front sprocket may be attached to the countershaft, and why you should NEVER use a worn sprocket with a new chain – at least not if you want the chain to last.
Pete talks about how changing the sprocket ratio – in his case, the number of teeth on the front sprocket – has improved his bike’s driveability. There’s an interesting aside, too, on the possible negative consequences of going for a smaller front sprocket.
Smaller bikes usually have a chain that is joined by master link. This link can be removed at any time by simply flicking off a clip. But larger bikes have the link riveted in place to make sure it can’t fall out. Many of us probably leave this to the bike shop – but as you’ll find out in this episode, it can be done fairly easily in your own garage.
In the last episode, Trent talked about the shark’s-fin wear that results on sprocket teeth as a chain and sprockets wear out. You can see it for yourself this time around.
Adjusting chain tension varies from bike to bike, both in the amount of tension and the mechanism involved, but Trent has some general tips.