Stator, Kokusan Flywheel and MOSFET Regulator Kit for Aprilia RSV4 & Tuono V4 2011-2020
Stator, Kokusan Flywheel and MOSFET Regulator Kit for Aprilia RSV4 & Tuono V4 2011-2020
SKU:RMS900-103810
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Improved Stator, Kokusan Flywheel and MOSFET Regulator Upgrade Kit
Aprilia RSV4 and Tuono V4 1000 / 1100 - Part RMS900-103810
A heavy-duty, recall-type charging system upgrade kit that addresses the well-known stator, flywheel and voltage regulator failures on the Aprilia RSV4 and Tuono V4. The original equipment used extremely strong magnets, and those magnets generated excessive heat. The result was burned stator windings and, in turn, a failed regulator. Replacing like for like simply resets the clock on the same problem.
This kit solves it at the source. It uses a Kokusan flywheel with lower-strength magnets, which reduces stator output and the heat that goes with it while still maintaining proper charging performance. The triple-tested heavy-duty stator, the MOSFET voltage regulator rectifier, the crankcase cover gasket and the flywheel puller are all supplied together, so the whole charging system is renewed in one job with the correct tool to remove the old flywheel.
Key Features
- Heavy-duty Kokusan brand recall-type OEM flywheel
- Lower-strength magnets reduce stator output and heat generation
- Triple-tested heavy-duty stator
- MOSFET voltage regulator rectifier, up to 50 A / 500 W
- Crankcase cover gasket included
- Flywheel puller included
- Complete solution to the common Aprilia charging system failure
Technical Specs
| Specification | Detail |
|---|---|
| Stator interior diameter | 43 mm |
| Stator exterior diameter | 105 mm |
| Stator thickness | 13.8 mm |
| Stator wire length, stator to grommet | 125 mm |
| Stator wire length, grommet to plug | 320 mm |
| Stator wires / plugs / pins | 3 wires, 1 plug, 3 pins |
| Stator resistance, yellow to yellow | 0.3 ohms, plus or minus 20 percent |
| Flywheel exterior diameter 1 | 121 mm |
| Flywheel exterior diameter 2 | 119 mm |
| Flywheel interior diameter | 107 mm |
| Flywheel centre housing, interior / exterior | 19.2 mm / 34 mm |
| Flywheel thickness, exterior / interior | 35.3 mm / 30.65 mm |
| Regulator width / length / height | 80 mm / 110 mm / 28 mm |
| Regulator wire lengths | 150 mm and 400 mm |
| Regulator fixation holes, centre to centre | 80 mm |
| Regulator plugs / pins / wires | 2 plugs, 7 pins, 7 wires |
| Minimum charging voltage | 14.5 V, plus or minus 0.5 V |
| Maximum charging current | 50 A / 500 W |
| Open circuit voltage | 15 V |
| Regulator operating temperature | -20 to 85 degrees Celsius |
| Puller thread size | 36 mm x 1.5, right hand male |
| Puller length | 60 mm |
| Puller exterior / interior diameter | 47 mm / 20 mm |
| Puller centre housing exterior diameter | 37 mm |
Vehicle Fitment Guide
| Make & Model | Years |
|---|---|
| Aprilia RSV4 | 2009-2020 |
| Aprilia Tuono V4 | 2011-2020 |
| Aprilia Tuono V4 1000 | 2011-2020 |
| Aprilia Tuono V4 1100 | 2011-2020 |
OEM Part Number Cross Reference
Aftermarket replacement. OEM part numbers are listed for reference only.
| Part Number | Manufacturer / Brand |
|---|---|
| 897479 | Aprilia - stator |
| 1A010574 | Aprilia - stator and flywheel |
| 2D000049 | Aprilia - stator and flywheel |
| B043488 | Aprilia - voltage regulator |
| RMS050-103753 | RMSTATOR - gasket |
| 020913Y | Aprilia - flywheel puller |
Frequently Asked Questions
Does the kit fit without modification?
Yes. Every part in the kit is a recall-type replacement for the original Aprilia components on the models listed above, and the flywheel puller supplied is the correct 36 mm x 1.5 right hand male thread for removing the original flywheel.
What is included in the kit?
A heavy-duty Kokusan brand recall-type OEM flywheel, a triple-tested heavy-duty stator, a MOSFET voltage regulator rectifier, a crankcase cover gasket, and a flywheel puller.
How do I know the original charging system has failed?
Measure the stator yellow to yellow: it should read about 0.3 ohms, plus or minus 20 percent, with no continuity to earth. Then check charging voltage at the battery with the engine running, which should reach at least 14.5 V. Burned or discoloured stator windings, a smell of scorched lacquer from the cover, and a battery that will not hold charge are the classic signs of the original failure on these bikes.
Why does the kit change the flywheel as well as the stator?
Because the flywheel is the root cause. The original magnets are extremely strong and drive excessive heat into the stator windings, which burns them out and takes the regulator with them. The Kokusan flywheel in this kit uses lower-strength magnets that cut stator output and heat while still charging correctly, so fitting the stator alone would leave the underlying problem in place.
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