SYM Fiddle and Mio 50 Key Replacement

Quick answerSYM's retro scooters all use cut keys with no chip, but they fall into two camps. The Fiddle 4 and the Mio 50 have a magnetic shutter over the keyhole, so their key needs the right magnetic head as well as the right cut. The Fiddle II and Fiddle III have an ordinary keyhole and a seat-open position in the ignition.

SYM Fiddle and Mio 50 key quick facts

The Fiddle 4 and Mio 50 manuals describe a magnetite key: it is inserted in a separate magnetite keyhole and turned right to uncover the ignition keyhole.
Pressing the black button next to the ignition closes the shutter again.
On the Fiddle 4 the fuel cap pops open from the ignition switch and locks itself when pushed shut.
The Fiddle II and Fiddle III have a seat open position in the ignition, reached by turning the key counterclockwise, plus a seat open button that works with the ignition on.
On the Fiddle II and III the fuel cap is under the seat and simply unscrews.
The earlier Mio 50 has a seat lock under the left front of the seat and an engine control switch inside the luggage box.

SYM Fiddle and Mio 50 key types by year

Years	Models	Key type	Chip	Notes
Current model	Fiddle 4 200i	cut key with magnetic keyhole shutter	no	Fuel cap released from the ignition switch. Steering lock by pressing the key and turning to LOCK.
Earlier and 2020 versions	Mio 50	cut key with magnetic keyhole shutter	no	Both Mio manuals show the magnetite key. The fuel cap opens from an OPEN position on the ignition switch.
Discontinued	Fiddle II 125, Fiddle III 200i	cut key	no	Seat open position in the ignition switch and a handlebar seat open button. Fuel cap under the seat.

The magnetite key, in SYM's words

SYM's manuals use an unusual name for an ordinary idea. The head of the key carries a magnetic pattern, and next to the ignition there is a small socket the manual calls the magnetite keyhole. Put the head of the key into it, turn right, and a block board slides away from the ignition keyhole. To cover the keyhole again you press the push rod or black button beside it.

The Fiddle 4 and both versions of the Mio 50 have this shutter. The Fiddle II and Fiddle III do not, according to their manuals, which show a plain keyhole.

Need a key for your Fiddle 4 200i?

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

Call (619) 775-1858 Text your year, make and model

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Seat and fuel, model by model

Fiddle 4: turn the key in the ignition to pop the fuel tank cap, and push the cap to lock it again
Fiddle II and Fiddle III: turn the key counterclockwise to the seat open position, or press the seat open button with the ignition on; the fuel cap is under the seat
2020 Mio 50: the fuel cap pops from the ignition switch, as on the Fiddle 4
Earlier Mio 50: a seat lock under the left front of the seat takes the ignition key, turned right, and the fuel cap opens from the ignition's OPEN position

Two SYM quirks that look like faults

A closed shutter is the first. The keyhole appears to be blocked by a metal plate and the key will not go in. Nothing is broken. The shutter needs the magnetic end of the correct key.

The second catches owners of the earlier Mio 50 and the Fiddle III. Those manuals list an anti-theft switch among the things to check when the engine will not start, and the Mio manual places an engine control switch in the luggage box under the seat. If that switch has been flicked, the scooter cranks or stays dead with a perfectly good key. Check it before blaming the key or the ignition.

Lost key on a Fiddle or Mio

Tell us the exact model and whether the shutter is open or shut. A Fiddle 4 or Mio key has to match the magnetic shutter as well as the lock, so the right key style matters. For a Fiddle II or III it is a straightforward cut key.

We confirm ownership with photo ID and the registration or title. A 50cc Mio may carry moped paperwork, which is fine. The new key is tested in the ignition, the steering lock, and the seat and fuel functions for your model.

Where to find the key code

These SYM manuals do not describe a key code tag or a place to write down a key number. Look for a number stamped on an original key and check the dealer paperwork. With no code, a key is made from the scooter's own 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)

SYM Fiddle and Mio 50 key FAQ

My Fiddle 4 keyhole is covered by a metal plate. What happened?

The shutter was closed with the button beside the ignition. Insert the magnetic head of your key into the small magnetite keyhole and turn it right to open the shutter.

Do SYM Fiddle keys have a chip?

No. None of the Fiddle or Mio manuals describes a transponder or immobilizer. The Fiddle 4 and Mio use a magnet in the key head for the shutter, which is mechanical.

Where is the fuel cap on a Fiddle III?

Under the seat. Open the seat with the key and the cap unscrews.

My Mio 50 won't start but the key turns fine. Is the key bad?

Check the engine control switch in the luggage box under the seat first. On the earlier Mio that switch has to be in the run position before the engine will start.

More SYM models

Services for this bike

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Mini Motorcycle and Moped Keys: Grom, Monkey, RuckusA lost key on a mini motorcycle is usually one of the simpler key jobs.
Harley-Davidson NO FOB or ENTER PIN Message: What to DoNO FOB in the odometer window means the motorcycle was ridden away without its hands-free fob in range.

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Page last updated November 14, 2026.