The Mordern Bajaj Chetak Rides One
Here is the answer I got from Bajaj when I asked them the same

The rim around the headlight is snapped on. Grab is at the bottom
with your fingers and pull forward, it will snap off.

Then unbolt the mirrors, then remove 4 screws from the bottom of the
headset that hold the top 1/2 on. Now you can access the bulb from
the rear of the head light.

You can use a 55 watt in place of the 35 watt. They are available
at automotive stores. Take you old one with you. I'm not sure of
the numerical designation.


The Modern Bajaj Chetak Rides On The Modern Bajaj Chetak Rides On