Motorbike bulb wattage and indicators flashing faster?

I have a honda motorbike that takes 12v 21w indicator bulbs

one bulb blew so nearest place i could get bulbs only had
12v 10w bulbs so i bought 2 bulbs and replaced both front bulbs
with 12v 10w

as i had only just bought the bike i'm wondering does the fact that i replaced 21w bulbs with 10w bulbs

make the indicators flash faster

i have some people say yes and others say no it's only the electrical draw the bulb takes and dosent effect the speed of the indicators flashing

You have 21W going through a 10W bulb.

Thats why they flash quick. Don't mess about the anything else on the bike, just throw those bulbs in the bin & simply buy the correct bulbs for the bike.

That way, it will work.

Indicator 'Flasher' control units are specifically designed to change flash speed if the load changes, as a signal that there's a problem.

They normally go to a much quicker flash mode when a bulb fails.

The early units were thermal-magnetic, and the lower current weakened the magnetic latch effect so the bulbs turned off quicker, before the thermal part had fully cooled. It then also turned on again quicker.

Modern electronic units also sense current and emulate this effect.

Diagram of an original style flasher unit:

(The text is not clear, but the diagonal line is the thermal element that heats up and expands due to the current through it, or heats & bends a bi-metal strip that anchors it).