Just a chain guide? A guy earlier in this thread said it needs to cover the top of the chain, and also high/low beam. But I see no mention of that on vic rads website.
Minimum Requirements
All recreation motorcycles must have:
a rear vision mirror fitted to the right hand side
brakes fitted to both wheels, capable of working independently if one brake fails
one head lamp
one rear red tail lamp
one rear red brake lamp
one rear white number plate lamp
a silencing device which restricts the noise level to 94 dBA or less
an appropriate horn or warning device
a chain guard that protects the rider from the front chain sprocket
IMPORTANT
All lighting used must be of a type intended for use on motorcycles.
A "total loss system" power source for the lighting is not acceptable.
If a battery is fitted to the motorcycle, an integrated charging system, such as an alternator, is required.
Magneto driving lights are acceptable if a battery is not fitted.
Recreational motorcycle registration : VicRoads