Honda CBR300R and CB300R Key Replacement

Quick answerThe CBR300R and CB300R use a plain cut key with no immobilizer in the US, according to Honda's US owner's manuals. A lost key is cut to the bike's locks on site and works straight away. The two bikes differ in one small way that matters later: the CBR300R comes with a key number plate and the CB300R with a bar-coded key tag.

Honda CBR300R and CB300R key quick facts

The 2018 US CBR300R manual and the 2020 US CB300R manual have no HISS or immobilizer section.
The CBR300R is supplied with a key number plate; the CB300R with two keys and a key tag carrying a key number and bar code.
One key works the ignition and steering lock, the fuel fill cap and the rear seat lock on both bikes.
On the CB300R the helmet holders are under the rear seat; on the CBR300R the helmet holder, helmet set wire, tool kit and a storage compartment are all under it.
Both manuals warn you to take care not to lock your key in under the seat.

Honda CBR300R and CB300R key types by year

Years	Models	Key type	Chip	Notes
2018	CBR300R, CBR300R ABS	mechanical cut key	no	Key number plate supplied with the keys. The manual says to take the spare key or the key number to the dealer for a duplicate.
2020	CB300R ABS	mechanical cut key	no	Two keys and a bar-coded key tag. The manual says to take the spare key and key tag to your dealer or a locksmith.

A simple key, with no chip

Honda's small singles keep the key system simple. Neither the 2018 CBR300R manual nor the 2020 CB300R manual for the US has an immobilizer section, a HISS indicator or any mention of coded keys. Both describe an ignition key that is cut to the lock and nothing more.

If you own a different year, a quick look in your manual's Keys section will confirm it, and we check from your VIN when you call. The practical upshot for US bikes with a plain key is that a duplicate is a straightforward cut and a lost key does not involve the bike's electronics at all.

Need a key for your CBR300R?

Call or text with the year and where the bike is parked.

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Because the seat locks itself when pushed down, both manuals carry the same warning: take care not to lock your key under the seat. If it happens, it is a lockout and not a lost key, and we can help where the bike is parked.

Ignition switch, which also locks the steering: push the key down and turn to the lock position. The key comes out in OFF or lock.
Fuel fill cap, under a lock cover. The key cannot be removed if the cap is not locked.
Rear seat lock: insert the key, turn clockwise, and the rear seat comes off
Under the rear seat: helmet holders, and on the CBR300R the helmet set wire, tool kit and a small storage compartment

One key, or a bent key

Used bikes are often passed along with a single key. If that is yours, get a spare cut now while it is a simple job. With one key and no key number, losing it turns a quick duplicate into an all-keys-lost visit.

On any bike, a tip-over with the key in the ignition can bend the key or damage the switch. If the key is bent, do not straighten and reuse it; a bent key is close to breaking, and a broken key in the ignition is a bigger job than a new key.

All keys lost

We confirm ownership with photo ID and the registration or title, cut a key to the locks on the bike where it sits, and test it in the ignition, fuel cap and seat lock. There is no programming step. Honda's manual notes that without the key number a dealer will probably have to remove the ignition switch assembly to find it, so bring out the key number plate or key tag if you have it, and do not worry if you do not.

Where to find the key code

CBR300R: on the key number plate that came with the keys. CB300R: on the key tag, next to the bar code. Both manuals tell you to keep it with the spare key in a safe place. If it is lost, the number can be recovered from the bike's locks.

What to have ready

Have this ready when you call or text

Year, make and model of the bike
Where the bike is parked
Whether you have any working key, a broken key or a key code
Photo ID and registration or title (we verify ownership before making a key)

Honda CBR300R and CB300R key FAQ

Does the CB300R have a chip in the key?

The 2020 US owner's manual describes a plain ignition key with a bar-coded key tag and has no immobilizer section, so a US-market CB300R does not need a chipped key.

I locked my key under the seat of my CBR300R. Can you get it out?

Yes. Honda's manual warns about exactly this because the seat latches when pressed down. We come to the bike, get the seat open and hand you your key back.

I bought a used CBR300R with one key and no number plate. What should I do?

Have a spare made from the working key now. It is the simplest key job there is, and it means a lost key later is an inconvenience, not a no-start.

The immobilizer system on this bike

Honda HISS Immobilizer: Keys, Lost Keys and the Warning LightHISS, the Honda Ignition Security System, is Honda's chip-key immobilizer: the engine only starts when the bike recognizes a coded chip in the key.

More Honda models

Services for this bike

When to Get a Spare Motorcycle Key, and Why NowGet a spare motorcycle key as soon as you are down to one working key.
Bought a Used Motorcycle With No Key? Here's What to DoA used or auction motorcycle without keys can usually get new ones, but plan on the full all-keys-lost process and bring the signed title or other transfer paperwork plus photo ID, since a locksmith or dealer has to tie you to the VIN.
Motorcycle Gas Cap, Seat or Steering Lock Stuck? What to DoStuck gas cap, seat and steering locks on motorcycles usually come down to grime or corrosion in an exposed cylinder, a worn key, a stretched seat cable, or parts under tension that hold the latch closed.
Does Insurance Cover Lost Motorcycle Keys?Usually not the key itself.

Where we come to you

Sources

Page last updated November 14, 2026.