The size of the chain can usually be found on the side of a link.
Generally sizes are referred to as 'pitch X length'.
Example: 428X114 - pitch of 428 and chain length of 114 links.
The distance between the chain pins is referred to as the ‘Pitch’.
Standard Chain: is a regular chain suited for smaller road bikes. (125cc-250cc)
Heavy Duty Chains: popular for mid- sized road bikes & most MX bikes.
O-ring Chain: Suitable for most road bikes over 400cc & also for MX/Enduro use. They retain lube better than HD chains.
Z-ring or X-ring Chains: Both retain grease longer than an O-ring due to the shape of the rubber rings.
Road bikes: Lubricate chain every 500-800 km’s.
Off-road/motocross bikes: Depending on riding conditions, however lubrication recommended after each ride and after each high pressure clean. Allow chain lube sufficient time to dry before riding again.
The motorcycle chain's appearance will be a good indicator of when to change your bike chain. If it's stretched or twisted, it's time to change your bike chain. You should also take a close look at the chain links, making sure that they're not worn. If they are, change them.
Always replace the chain and both sprockets at the same time. A worn component will shorten the life of the rest.