Workshop Services


  • TZ Rewinds
  • Kawasaki Triple CDi Ignition & rewinds
  • SR500/RD250/RD350 Rewinds
  • Rotax MT350 | MT500 | CCM604 Rewinds
  • Suzuki GT models Including 750cc
  • Honda CB72-77, CB250 & CB400 CDi units& Rewinds
  • XS650 – Coming soon!
  • Testing of regulator rectifiers
  • Lucas Rita repair and knowledge centre
  • Full Testing of Pazon Ignitions
  • Full Testing of Tr-spark Ignitions
  • Classic bike ignition systems
  • Dynamo parts specialists
  • Testing of CDI Units

As of August 1st 2023 we will no longer be taking in general rewind work.

This has been a tough call however this will allow us to better support a selected range of classic machines such as the Kawasaki Triples as well as a number of four stroke machines. If your machine is not listed above we regret we will not be able to offer a rewind to the stator. It is our intension to focus our efforts on reducing turn round times for rewinds on the selected range of classic machines listed above as well as increasing the production of new parts. The for customer this means more parts available with no or very short waiting times.

One area we are expanding is offering a testing service so the home mechanic can get a quick and definite answer on difficult to test items such as CDi units and regulator rectifiers. We are able to test systems such as the Pazon, Tri-spark and Lucas Rita. Our technical team will them be able to advise on the best way to proceed.

We will continue to supply an increasing range of new alternator parts and our experts are on hand to test parts and advise on electrical issues.

During this transition time certain pages of our website may contain out of date information. Please accept our apologises while we up-date the site.


We welcome trade customers who may access special rates and technical support once a trade account has been approved.

Rex's Speed Shop for magneto rewinds and repairs


Our workshops are working to offer overhauled stators on an exchange basis for a selected range of classic models. Provided stock is available this could mean a next day service.


Please note the V7 document is out of date and has been withdrawn. We will not honour prices shown in that document as of 01/08/2023

Click on the image to view the latest pricing guide (opens a PDF Document)

rexs speed shop cdi unit, dynamo alternator generator magneto stator rewind repair, regulator rectifier, ht coil, replacement

Sending parts to us

Please send your item to:

Rex’s Speed Shop
Unit 1, Russet Farm
Redlands Lane
East Sussex
TN32 5NG
United Kingdom

  1. Include your contact details as well as a phone number or e-mail address. Delay results if we are not able to contact the owner for authorisation to proceed with work.
  2.  Letters that read “As per telephone conversation here’s the part for repair” can cause long delays in having your job started. Workshops have to find the member of sales team you spoke to, that person may not be due in to work for several days. The way to avoid this is to include a conscise explaination along with the item you have sent.  If you have e-mailed us, including a copy of the e-mail is very helpful and will speed things up.
  3. When sending from overseas, IE the USA or Australia, the value you declare on the parcel may cause import duty and VAT to be applied. Any duty we have to pay will be added to your bill in addition to any quoted price for the work. Be realistic of the value of a failed, second hand unit!
  4. We do not recommend customers strip parts out of a stator assembly and send them. In case the repaired part does not fit after repair, if we did not have the whole assembly rework is charged extra.

Repair work is chargeable per hour and workshop prices are always quoted excluding VAT.


We accept most major credit and debit cards over the phone or we can send you a secure payment link via e-mail.

Overseas customers may wish to use TransferWise. This service saves a considerable amount on foreign currency transactions because you pay the actual exchange rate, plus a small fee. Its far cheaper than your bank. Pay Pal costs 19 times more to send foreign currency than TransferWise. We use & recommend TransferWise ourselves.

We trade in £GBP and €EUR, please let us know which currency to invoice in. We can supply our bank account details on request, please state which currency you prefer.

Trade sales – to obtain the best discount payment must be via bank transfer.

Unfortunately we no longer accept cheques

We DO NOT accept AMEX


The Lucas RITA (Racing Ignition Transistor Amplified) has a long reputation for performance and reliability. However thirty year old electronics will be tired or may have failed completely. Rex’s Revival circuit board now means that you up-grade it with all new, modern electronics but without changing any other parts of the ignition.

There are two options one fits the AB5 case, the other the AB 11 both designed to be compatible with the rest of the RITA system. Rex’s offer a high quality, modern circuit to fit inside either the AB11 or the AB5 case. The new unit is built and assembled in our own workshops and features the latest SMD components, ensuring excellent performance.

The new unit uses less power than the original RITA and features up-dates to the old design including reverse polarity protection, over volt protection and triple protection to the main transistor. The new unit is far tougher and less likely to be damaged than the original. Available for; Vincent, Moto Guzzi, Ducati, Moto Morini, Aermacchi, Hestketh, Japanese and British motorcycles that have a RITA fitted. Suitable for home fitting, comes with a comprehensive fitting guide. Our workshops are able to fit the new part to your existing RITA case for you.

Made in England


Machines with rotors connected to the regulator via brush gear (Pre mid 1980s) or self contained alternators (mid 1980s on).

New windings are made in-house, rotor windings are produced on CNC machines. Stator windings have to have special tooling made, where we have to make tools ‘one-off production’ time scales apply. We will inform you of this and of any additional cost. The finished assembly is subjected to a full bench inspection, including aligment for rotors. We now offer a replacement slip ring assembly for the Suzuki GT750 rotors. Voltage regulators that fit into original cases are under development.

We are able to repair and overhaul self contained alternators made after the mid 1980s. These have the regulator and rectifier inside the alternator as car units have. Parts availability is an issue although our technicians may be able to find a solution where others may not.

rex's speed shop alternator stator rewind repair sevice


Racing ignitions require careful repair to get the best from them. Our CNC machines give the exact number of turns, wire tension and ensures each layer is built up evenly. We have a wealth of experience with racing ignition systems and over the years we have carefully catalogued each one to create an extremely comprehensive reference database. As a result we can offer fixed price rewinds and fast turn rounds of these systems.

We can supply new ignition units or put modern electronics in to original cases to maintain original appearance for some of these systems.

Ignition Unit Testing & Repair

We are able to test many pre-1990s transistor and capacitor discharge boxes on the bench. Some repairs are possible where the electronics are not set in resin. If the electronics are fully encapsulated generally no repair is possible. We are able to manufacture an increasing range of new, replacement units to replace failed ones. Please check with us before sending your unit for testing.

-Resin filled electronic units are not repairable-


We restore many electronic parts to look like brand new original equipment with the benefit of modern reliability. This service is highly popular with restorers who are looking to achieve a perfect machine complete with its original electrics that work reliably. We offer:

  • Electronics design & manufacture
  • Plating & anodising to ISO standards
  • Blast cleaning and polishing
  • Welding
  • Turning and milling
  • Sourcing of rare NOS parts
  • In-depth knowledge of Japanese electrical systems

We work to standards associated with overhauling aircraft components to restore rare motorcycle parts to ‘as new’. We have developed our own processes and equipment to strip and re-assemble parts without damaging them. Much of the restoration work is carried out in-house, with the excepting of plating and a few specialist processes.


We restore many electronic parts to look like brand new original equipment with the benefit of modern reliability. This service is highly popular with restorers looking to achieve a perfect machine complete with its original electrics that work reliably. We offer:

Fully restored Kawasaki H2/A Solid State Magneto (CDI) assembly

First the cases are stripped of the old electronics which are then professionally zinc plated to ISO 2081. Modern electronic circuits are built and test run before they are sealed to the refurbished cases. The unit is fully assembled, tested on the bench and the work is completed with a new set of decals and lead idents

Kawasaki H1/D Stator rewind

Newly manufactured Honda RS500 stator

Fully repaired and rewound TZ250 4DP generator stator

‘Restored & reloaded’ KH400 CDi unit

New electronics, case professionally replated to ISO2081, new leads & connectors backed by a one year warranty

Rex's Speed Shop for magneto repairs, rewinds and problems solving

Lucas K1F Magneto Rewind by Rex’s Speed Shop

Sent to us as the engine faded and wouldn’t start when hot. Our technicians traced the fault to failed armature windings. The armature was rewound and a modern condenser fitted. After refitting the engine roared in to life first kick