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.

Co-Co kits: We are currently unable to source motors for our LA1, LA3 and HA1 kits and all are now out of stock. We have designed new adaptors that fit all of the same models and feature a quality 9mm Mabuchi motor:

LA1 now use LA5
LA3 now use LA3B
HA1 now use HA5

Note: The brand new LA3B and HA5 adaptors have been designed, are being manufactured right now and the kits will be available very shortly.

Lima Replacement CD Motor & Adaptor ‘Lighter Use’ Kit (LA5/9MM/Co-Co)


Only 4 left in stock


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

    • a replacement 9mm thick 6Vdc high torque can motor,
    • computer-designed 3D-printed adaptor,
    • 2 x 8-tooth gears (one spare), and
    • a length of heat shrink tubing.

This kit requires no permanent adaptation to be made to the motor bogie and therefore the original ringfield (pancake) motor can be reinstalled at any time; the motor, adaptor and/or gear can be replaced with ease, if ever the need arises.

Please note: This is the smallest Lima replacement motor that we supply. It is compatible with all of the same models as our LA1/Co-Co/10mm kit, however, due to its smaller magnet, we recommend that this kit is not used in models that will see heavy use or will be expected to haul long rakes or coaches etc. Marketed as a ‘lighter use’ option, it’s best suited to locos that see less frequent outings.

Read more about our ringfield adaptor kits here: www.strathpefferjunction.com/ringfieldadaptors


We have tested the adaptor in UK outline models marked with an asterisk below. Based on visual assessment, this adaptor should also work with all ringfield models listed. Very occasionally, light sanding may be required around the lugs to ensure clearance.

Class 31*
Class 37*
Class 40*
Class 47*
Class 50*
Class 52 (Westerns)*
Class 55 (Deltics)*
Class 57
Class 59
Class 60
Class 66
Class 92*
Class 201 (Irish Diesel)
King Class (Tender Drive)
Fowler 4F 0-6-0 (Tender Drive)

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


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 25 g

Usage Advice

1.  Our replacement motors are low-noise DC motors designed for CD/DVD drives. The output from a DCC decoder or a DC controller can exceed their voltage rating depending on how hard hard the loco is being worked. Whilst our own tests (and those of many others before us) show that these motors are capable of handling voltages higher than their rating, in order to avoid motor burn-out, prolong motor life and achieve prototypical speeds, we recommend:

    • For DC/Analogue use, speeds are kept low manually via the controller and a diode* voltage dropper should be considered in order to reduce voltage going to the motor (as outlined in the instructions);
    • For DCC use, speeds are kept low manually via the controller, decoders should have their CV5 value reduced (if available) and, particularly where CV5 adjustment is not available, a diode* voltage dropper should be considered in order to reduce voltage going to the motor (as outlined in the instructions).

2.  With all CD-style motor conversions, it is good practice to: i) maintain very high speeds for relatively short periods only, ii) keep running on steep inclines to a minimum, iii)  avoid coupled up with excessively long rakes of coaches/wagons, and iv) where less robust 10mm motors are fitted, resist the temptation to fit additional weight to the loco.

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.


The following instruction manuals are available for this product:


Instructions for 9mm Lima Ringfield Motor Upgrade Kits (LA5) 444.02 KB 40 downloads

Step-by-step instructions for our 9mm/LA5 Lima ringfield motor upgrade kits.  Last...

Lima Replacement Motor Kits Troubleshooting Guidance 8.00 KB 166 downloads

We have prepared a troubleshooting guide to address some of the rare, but potential...

Ringfield Motor Upgrade Kit Label 1.65 MB 189 downloads

Product label. ...

Ringfield Motor Upgrade Kit Product Leaflet 948.78 KB 177 downloads

Product overview leaflet. ...


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