Welcome to the Strathpeffer Junction shop. UK shipping for OO Gauge ringfield adaptor kit orders is £2.99, irrespective of how many are purchased. We also ship to Ireland, mainland Europe, USA, Canada, Australia and New Zealand. Due to lockdown restrictions and our reliance on a mobile post office, parcel-sized orders are currently dispatched at Tuesday lunchtimes weekly, while letter-sized orders are dispatched twice weekly.

EU Orders
Due to recent VAT changes in the UK & EU, orders shipped to the EU will now be liable for Import VAT. How that charge is applied (as well as any admin fees) will vary from country to country, but in most cases you will be asked to pay these fees before the item is delivered to you. You can also buy our kits on eBay, where Import VAT is covered in the postage costs.

Basic 12V (12mm x 24mm) Motor Upgrade Kit for Lima or Hornby


Out of stock


This is a basic motor, gear and alignment tool kit. It does not include a 3D-printed adaptor and will require glue to fix the motor into the motor bogie.

A brand new OO Gauge Lima ringfield motor conversion kit, comprising:

    • a high quality Mabuchi 12V low-noise can motor,
    • 1 x 8-tooth gear (for Lima),
    • 1 x 10-tooth gear (for Hornby),
    • a brass shaft alignment tool, and
    • some basic instructions.

This kit uses a 12Vdc motor, so no diodes are required and CV5 programming is optional.

If you’d prefer one of our plug-and-play 3D-printed adaptor kits, you can read more about them here: www.strathpefferjunction.com/ringfieldadaptors



We have tested the motor in UK outline Lima models marked with an asterisk below. Based on visual assessment, this motor should also work with all ringfield models listed.

Class 26*
Class 27*
Class 33*
Class 42 (Warships)*
Class 43 (HST)*
Class 73*
Class 87
Class 101*
Class 117*
Class 121 *
Class 156
Class 373 (Eurostar)
Class 960 Sandite Unit*
GWR Railcar*
0-4-0 (Diesel & Steam)


This motor will fit most OO gauge Hornby Bo-Bo ringfield models. However, Hornby have produced a wide range of varieties of ringfield motor, and some configurations may be more tricky to covert than others. We encourage customers to contact us before placing an order so that we can discuss requirements and help to identify any potential issues or key considerations.

Prefer an easier plug & play option?

★ For our 6V 12mm/Bo-Bo Lima 3D-printed adaptors, please click here.
★ For our 10mm/Co-Co Lima 3D-printed adaptors, please click here.
★ For our Small Loco Lima 3D-printed adaptors (suitable for Class 08/09 shunters and GWR Prairie), please click here.

Need for speed?

This motor in this kit is rated at 12 volts (D/V 13.0) and whilst it’s the bomb proof option, it may run a little slower than 6 volt (D/V 5.9) CD/DVD motors. Those seeking the fastest possible speeds for HST sets etc. may still prefer our 6V adaptor upgrade kit or 6V basic kit, along with a diode voltage dropper.


We can accept no liability or responsibility for any damage or injury occurring from the installation and use of our motor replacement kits. Installation requires modifications and the use of tools, some of which have the potential to damage you and/or you models, as well as other components and equipment. Users must not commence work unless they are confident that they have the skills and experience necessary to complete it successfully, and install these kits and undertake work to their models at their own risk.

Additional information

Weight 50 g



1.5 to 12.0






Usage Advice

1.  This high-quality conversion kit uses a 12V motor (D/V 13.0v), so there is no need to use a diode voltage dropper or keep speeds low using CV5 adjustment.

2.  With all CD-style motor conversions, it is still good practice to: i) maintain very high speeds for relatively short periods only, ii) keep running on steep inclines to a minimum, and iii)  avoid coupled up with excessively long rakes of coaches/wagons.

3.  It is recommended that locomotives fitted with our 3D printed adaptor kits are not run for more than an hour continuously; this is to prevent the motor temperature from exceeding the glass transition temperature of the plastic.

4. We recommend that locomotives fitted with can-style CD motors are:

★ Not run without a DCC decoder as ‘Locomotive 0’ on a DCC model railway layout (this is will lead to over-heating and rapidly ruin the motor), and

★ Not placed on the tracks whilst a high frequency track cleaner (such as the Gaugemaster HF-1/HF-2)  is in operation. There have been some reports that the frequency can damage the motors, although it is not something that we have tested.


We currently only have a video tutorial available for this product:

Note: the brass shaft alignment tool doesn’t feature in this video as it’s a newer addition. The tool should be inserted into the brass bushing and over the shaft of the new motor before glue or resin is applied. This ensures that the shaft does not bind or rub on the bushing. Once the glue or resin has dried, the alignment tool is removed.


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