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Moto Guzzi (75-92), BMW Boxer (70-76) Bosch Alternator Replacement Kit - 105mm Adaptor Plate- STK-502

Moto Guzzi (75-92), BMW Boxer (70-76) Bosch Alternator Replacement Kit - 105mm Adaptor Plate- STK-502
Moto Guzzi Bosch Alternator Replacement Kit - (STK-502)Stator assembly mounted on to the engine - (STK-502)Wiring Diagram - (STK-502)Moto Guzzi (75-92), BMW Boxer (70-76) Bosch Alternator Replacement Kit - 105mm Adaptor Plate- STK-502 - view 4

Price (excl. vat): 325.00
(390.00 Including VAT at 20%)

Many of these items are made to order.
You will be advised on any delay.

Stator Kit Fits:

Moto Guzzi:1975-1992
Bosch alternator replacement kit

NOTE: Some BMW models also have location diameters of 105mm. NOTE: For years 1974-75 there may be a cross over, so please be careful and measure as accurately possible. If your adaptor ring has a measurement of 107mm you need to see our part STK-500 - link in related products below.

  • New permanent brushless alternator - up to 400w output.
  • Excellent output at low speed - 20amp at only 2000rpm, therefore ideal for Moto Guzzi.
  • Very heavy duty series regulator/rectifier with output cable for 'charge warning' indicator.
  • Fitting kit precision CNC machined from single billet with either stainless steel or anodised aluminium used.
  • Direct fitting no mechanical modifications required, minimal wiring for reliability.
  • Designed and manufactured to modern OEM specifications.
  • Manufactured in the UK.

Click the following link to download fitting instructions:
Download Instructions


  • Road bike components - one year from the date of purchase
  • Off-road bike components - six months from the date of purchase
  • Race bike components - no warranty in line with industry practice
  • Any warranty does not cover defects due to abuse, misuse, improper installation or modification.


If any items were damaged in transit, we ask that you report it to us within 7 working days. On their return they can be replaced or a refund issued via your original payment method.

Faulty on arrival

If your items are faulty on arrival, you should inform us within 14 days of delivery. Items should be returned in their original packaging when possible with a copy of original documentation. Once we have verified the fault, we will issue a replacement or full refund to you via your original payment method.

Items faulty in warranty period

If any of your purchases develop a fault within its warranty period it will need to be returned. Once the fault has been verified, a repair or exchange of goods will be issued. If goods are found to be in good working order a testing/administration charge of 15 + VAT and return postage will be made to the customer.

Items ordered in error

If an item has been ordered in error, you should inform us within 14 days of delivery. We will not accept returned goods without prior consent except under guarantee. A minimum restocking/administration charge of 5 + VAT will be made on returned goods.

Returns We want you to be happy with your purchase from Electrex World Limited however there may be certain instances when products may need to be returned.

International Returns

International returns must be marked as 'Return - Failed Sale on any customs documentation. If there are any customs fees to pay, we will deduct these from your refund/credit.


  1. All returns must be accompanied by a copy of the original invoice and a completed returns form which can be downloaded using the following link:
  2. Returns take approximately five business days to process upon receipt of the item.
  3. We are not responsible for the loss or damage of items during their return. Please note that the customer has a duty of care whilst the goods are in their possession and that they should be thoughtfully packaged for the return shipment.
  4. Buyer is responsible for any shipping charges when returning the item.
  5. When fitting electrical parts these can be damaged by the same faulty electrical system that caused the initial failure and in such circumstances these parts cannot be returned for refund.
  6. No refund can be given If the item is out of warranty, if the item is within warranty but has been subjected to conditions beyond their specification or the item has been fitted/used.

Return Address

Electrex World Limited Units 43-46 Vanalloys Business Park Stoke Row Oxfordshire RG9 5QW

2006-2016 Electrex World Ltd. All rights reserved. Home | Terms & Conditions

Registered in England & Wales Company Registration number 04306310. VAT number 785 299 174.

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