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I own a Royal Enfield Bullet (std) 350cc 2013 uce model. The bike is fitted with a 35/35w HS1 PX43t halogen bulb. I want to replace it with a 60/55w halogen H4 bulb.

Earlier I had installed the self start motor on the bike so the battery has also been changed from 5Ah to 14Ah.

Do I need to install a relay, or rectifier and new wires? Will the H4 bulb fit in the existing holder? What are the other things I need to consider before installation? So that no harm is done to battery or electrical system.

Rory Alsop
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JOHNSON FERNANDES
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1 Answers1

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This thread on a motorbike forum suggests that an H4 bulb will fit in an HS1 holder, but that the bike in their question has a plastic lens that could melt - yours may be the same?

Does the alternator have enough power to run the higher-wattage bulb and recharge the battery?

I would always use a relay when upgrading or adding lamps, Halogens work much better when they have the full voltage and current available to them, and using a relay and good quality suitably rated wiring reduced the losses involved. Always use a fuse as well!

Nick C
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