The 79cc is a partial chair that helps keep the legs cleaner and away from the bike parts. This particular chain guard is compatible with a 66/80cc bullet train electric start engine. Without the chainguard, there are chances your trousers may rip apart, so with the chainguard, you get maximum trouser protection.
The 79cc air filter adapter will keep your bike’s chain fairly lubricated as it does not allow the chain’s lubrication to wash away. With proper lubrication, you don’t have to clean the bike chain multiple times. Also, your clothes won’t get dirty in grease with the chainguard if your feet or legs touch the chain.
The chainguard is black and has a smooth finish, so it will ideally suit the bike design and enhance its overall look and performance. The chain also does not allow your sprockets and chain to get messy due to dirt. With the chain, you can stay assured of the bike chain's proper functioning as it helps safeguard the chain against external factors.
Part #13 on the Drivetrain Diagram