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Your Grom 125 will not start, the fuel cap will not open, and there is no key anywhere. That is a lost-all-keys situation, and it parks the bike until every lock is solved.

A locksmith can cut a new key, but quotes often run past $100 and not every shop works on bikes. The clean fix is swapping every lock at once. The ignition switch, fuel tank cap, and key lock set for the Honda Grom 125, Rebel 300, and CBR500R is in stock at $47.34.

What a lost key really costs

Price the alternative before you order anything. Locksmith numbers for a lost motorcycle key are all over the map.

• A mobile locksmith visit for an all-keys-lost bike commonly runs $185 to $250.
• Carry the bike, or one removed lock cylinder, to a shop and the decode-and-cut can drop to about $30.
• One Grom 125 owner was quoted over $100 locally, while a Honda dealer asked $10 for a key cut from the key code.
• A Honda Rebel 300 forum member collected a $300 quote and chose to replace the ignition, gas cap, and fork locks instead.

The cheap route depends on the key code. A key code is a short stamp, usually one letter and two digits, that tells a locksmith the exact cut depths for your locks. On the Grom 125 it is stamped on the ignition switch body.

Losing every key kills that route, because the code now sits on a lock you cannot read without tearing the bike apart. That is when a complete lock set stops looking expensive.

The year split that decides your order

Honda has built the Grom 125 across three generations, and the lock hardware did not stay still. The first generation ran through the 2016 model year. The second generation arrived for 2017, and Honda's own press material calls the 2022 model the third iteration.

Order by year, not by looks. A set built for a 2014-2015 Grom 125 looks almost identical to a 2018 part and does not bolt up the same way.

If your bike is a 2014-2015 Grom 125 or MSX125, the dedicated fuel tank cap, ignition switch, and seat lock key set is $27.29. If you ride a 2017-2024 Grom 125 or MSX125, the ignition switch and fuel cap lock set with two keys is $34.12.

Specifications at a glance

The price ladder tracks fitment, not quality. The cheapest set is also the narrowest. The $47.34 set earns its premium by covering three Honda models in one order.

What keyed alike means on the Grom 125

Keyed alike means every lock in the set is cut to the same new key. One key then runs the ignition, the fuel cap, and the seat lock, exactly like the stock design.

• Stock behavior: one key for the ignition switch, the fuel cap, and the seat lock.
• Piecemeal repairs leave you carrying two or three different keys on one ring.
• A matched set restores the one-key habit and includes spare keys from day one.

Keep one original key in a drawer after the swap if you still have it. It will not open anything anymore, and that is exactly the point.

Installation, lock by lock

The whole job is driveway work with basic hand tools. Order matters more than skill.

1. Disconnect the battery before you touch the ignition switch.
2. Remove the fasteners holding the switch, then lift it free and unplug its connector.
3. Plug the new switch into the stock harness; no wire cutting or splicing should be needed.
4. Swap the lock cylinder in the fuel cap and transfer the cap hardware.
5. Change the seat lock last, because the latch sits under the seat pan and has the least room to work.
6. Cycle every lock several times with each new key, then do a full start-and-run check.

One check belongs before the order, not after it. Compare the wire count on your old ignition plug with the photos in the set you are buying. First-generation bikes and later bikes do not always share the same plug.

Locks are one layer, storage is the other

New barrels stop old keys, not a van with a ramp. For street parking or winter storage, pair the fresh lock set with real cover protection.

Our waterproof motorcycle cover guide walks through material grades and tie-down points for outdoor storage. Tank caps, seat pans, and body trims for the same bikes sit in the exterior parts collection if you are refreshing hardware anyway.

Frequently asked questions