Recall Kit | Stator+Kokusan Flywheel+Mosfet Regulator+Gasket | Aprilia RSV4 |Tuono V4 1000/1100


Upgrade Kit | Stator+Kokusan Flywheel+Mosfet Regulator+Gasket | Aprilia RSV4

Item Condition: New

Brand NEW Upgrade Kit

Introducing our newest heavy-duty charging system upgrade kit for Aprilia 2009-2017 RSV4 & 2011-2017 Tuono V4.

Anyone who rides or repairs Aprilia’s motorcycles is probably familiar with the flywheel problems common to these models.
Most of these bikes will have had at least one flywheel failure in their lifetime so far.
Low quality epoxy was used on OEM flywheels to secure the magnets to the rotor body.
Over time and many heat cycles, the epoxy fails allowing the magnets to come loose and contact the stator, potentially causing catastrophic damage.

To prevent or correct the flywheel problems, our engineers at RMS Labs have come up with a complete reliable heavy-duty charging system replacement kit for your Aprilia.
The kit includes a brand new MOSFET voltage regulator since it is often damaged when stators fails.

Included in this kit:

  • Heavy-duty Kokusan brand recall-type OEM flywhee
  • Triple-tested heavy-duty stator
  • Heavy-duty voltage regulator with RMSTATOR’s renowned MOSFET regulation technology

With this kit, you will be able to upgrade your current failure-prone charging system with a heavy-duty version using the latest technologies.


  • Built to OEM size
  • Fits precisely in your ride: install it and forget it.
  • RMSTATOR renowned MOSFET voltage regulation design
  • Significantly decreases internal operating temperature with highly efficient MOSFET transistor regulation circuit.
  • This technology runs much cooler than the OEM silicon rectifier regulation circuit and requires much less power to operate.
  • Improved epoxy
  • Uses high temperature epoxy that is stronger than OEM, eliminating the possibility of magnet detachment.
  • High grade steel capping
  • Prevents harsh additives in motor oil from degrading the epoxy attaching the magnets.
    Though extremely unlikely, if a magnet did ever come loose, it would remain in the sleeve preventing contact with the stator.
  • Precise balancing/strong
  • Eliminates crankshaft vibrations for longer engine longevity.

Don't waste time with temporary solutions, and start fixing your ride like a pro!

Please note: This version of the stator and flywheel are in use for RSV4 engine numbers higher than 3413 only. All Tuono V4s seem to use this Kokusan version. Double-check the flywheel with your original before buying this kit.

Used on the following applications:

    • Aprilia RSV4 1000 Factory (2012-2015)
    • Aprilia RSV4 R 1000 (2011-2015)
    • Aprilia RSV4 RF 1000 (2016-2017)
    • Aprilia RSV4 RR 1000 (2016-2017)
    • Aprilia Tuono 1100 Factory (2016-2017)
    • Aprilia Tuono 1100 RR (2016-2017)
    • Aprilia Tuono V4 1000 (2012-2015)

For full application / interchanges listing, please see our part Application / Fitment section below


SKU: RMS900-103810

£342.00 (£285.00 exc. VAT)

Lead Time: Aprox 1 working day

Item in stock




Interior diameter : 42 mm 
Exterior diameter : 105 mm 
Thickness : 15 mm 
Length of wires stator to grommet : 100 mm 
Length of wires grommet to plug : 330 mm

Other specifications :
Number of wires : 3
Number of plugs : 1
Number of pins : 3

Wire to wire resistance :
Alternator : Between Yellow = 0.4 ohms +-20%


Exterior Diameter: 121 mm 
Interior Diameter: 107 mm
Interior Diameter Center Housing: mm
Exterior Diameter Center Housing: mm
Thickness (exterior): mm
Thickness (interior): mm

Mosfet Voltage Regulator 

Width: 80 mm
Length: 110 mm 
Height: 28 mm
Wires length: 150 & 400 mm
Fixation holes center to center: 80 mm

Other specifications: 
Number of plugs: 2
Number of pins: 7
Number of wires: 7
Minimum Charging Voltage: 14.5V +- 0.5V 
Maximum Charging Current: 50A/500W 
Open Circuit Voltage: 15V 
Operation Temperature: -20⁰ to 85⁰



    Limited 12 months Warranty Offered on all products except CDIs.

Click and collect | Order by 3pm for same day dispatch

Click the model to see other products for that vehicle

Part Application / Fitment

Model Code Year Engine
RSV 4 R ABS RMS900-103810 2011 APRILIA 1000cc
RSV 4 R ABS RMS900-103810 2012 APRILIA 1000cc
RSV 4 R ABS RMS900-103810 2013 APRILIA 1000cc
RSV 4 R ABS RMS900-103810 2014 APRILIA 1000cc
RSV 4 R ABS RMS900-103810 2015 APRILIA 1000cc
Tuono V4 R APRC RMS900-103810 2012 APRILIA 1000cc
Tuono V4 R APRC RMS900-103810 2013 APRILIA 1000cc
Tuono V4 R APRC RMS900-103810 2014 APRILIA 1000cc
Tuono V4 R APRC RMS900-103810 2015 APRILIA 1000cc

Interchanges / Cross References

Manufacturer No Manufacturer Name
2D000049 APRILIA
897479 APRILIA


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