RFX Race Start Button KTM All Elec Start Model 250-530
Part no. FXKB 50900 55ST
The RFX Race Start Button KTM All Elec Start Model 250-530 from RFX is listed to fit 65 models from KTM, Husqvarna and GasGas, including KTM 125 SX 2022-2027, KTM 125 XC 2022-2027 and KTM 125 XC-W 2022-2027. It is part of our switches range.
- Part number: FXKB 50900 55ST
- Fits KTM: 125 SX 2022-2027, 125 XC 2022-2027, 125 XC-W 2022-2027, 150 EXC 2020-2023, 250 EXC 2019-2026, 250 EXC-F 2011-2019, 2022-2027, 250 SX 2022-2027, 250 SX-F 2011-2027 and 18 more
- Fits Husqvarna: 450 RALLY 2025, FC 250 (FC250) 2014-2027, FC 350 (FC350) 2014-2027, FC 450 (FC450) 2014-2027, FE 250 (FE250) 2014-2019, 2022-2027, FE 350 (FE350) 2014-2027, FE 450 (FE450) 2014-2019, 2022-2027, FE 501 (FE501) 2022-2027 and 12 more
- Fits GasGas: EC 125 (EC125) 2025, EC 250 (EC250) 2021-2026, EC 250 F (EC250F) 2021-2026, EC 300 (EC300) 2022-2026, EC 350 F (EC350F) 2021-2026, EC 450 F (EC450F) 2024-2026, EX 250 (EX250) 2022-2026, EX 250 F (EX250F) 2022-2025 and 11 more
- Category: Vehicle Parts › Electrical › Switches
Specifications
| Brand | RFX |
|---|---|
| Manufacturer Item No. | FXKB 50900 55ST |
Fits these bikes
This RFX part is listed as fitting 65 models. Check your model and year below.
| Make | Model | Years |
|---|---|---|
| GasGas | EC 125 (EC125) | 2025 |
| GasGas | EC 250 (EC250) | 2021-2026 |
| GasGas | EC 250 F (EC250F) | 2021-2026 |
| GasGas | EC 300 (EC300) | 2022-2026 |
| GasGas | EC 350 F (EC350F) | 2021-2026 |
| GasGas | EC 450 F (EC450F) | 2024-2026 |
| GasGas | EX 250 (EX250) | 2022-2026 |
| GasGas | EX 250 F (EX250F) | 2022-2025 |
| GasGas | EX 300 (EX300) | 2022-2027 |
| GasGas | EX 350 F (EX350F) | 2022-2026 |
| GasGas | EX 450 F (EX450F) | 2022-2024 |
| GasGas | MC 125 (MC125) | 2022-2027 |
| GasGas | MC 150 (MC150) | 2025-2026 |
| GasGas | MC 250 (MC250) | 2022-2026 |
| GasGas | MC 250 F (MC250F) | 2021-2027 |
| GasGas | MC 300 (MC300) | 2025 |
| GasGas | MC 350 F (MC350F) | 2022-2026 |
| GasGas | MC 450 F (MC450F) | 2021-2027 |
| GasGas | RX 450 F (RX450F) | 2023 |
| Husqvarna | 450 RALLY | 2025 |
| Husqvarna | FC 250 (FC250) | 2014-2027 |
| Husqvarna | FC 350 (FC350) | 2014-2027 |
| Husqvarna | FC 450 (FC450) | 2014-2027 |
| Husqvarna | FE 250 (FE250) | 2014-2019, 2022-2027 |
| Husqvarna | FE 350 (FE350) | 2014-2027 |
| Husqvarna | FE 450 (FE450) | 2014-2019, 2022-2027 |
| Husqvarna | FE 501 (FE501) | 2022-2027 |
| Husqvarna | FS 450 (FS450) | 2022-2026 |
| Husqvarna | FX 350 (FX350) | 2022-2027 |
| Husqvarna | FX 450 (FX450) | 2022-2027 |
| Husqvarna | TC 125 (TC125) | 2022-2027 |
| Husqvarna | TC 150 (TC150) | 2025-2026 |
| Husqvarna | TC 250 (TC250) | 2022-2027 |
| Husqvarna | TC 300 (TC300) | 2025-2027 |
| Husqvarna | TE 125 (TE125) | 2025-2027 |
| Husqvarna | TE 150 (TE150) | 2020-2027 |
| Husqvarna | TE 250 (TE250) | 2019-2027 |
| Husqvarna | TE 300 (TE300) | 2019-2027 |
| Husqvarna | TX 300 (TX300) | 2022-2027 |
| KTM | 125 SX | 2022-2027 |
| KTM | 125 XC | 2022-2027 |
| KTM | 125 XC-W | 2022-2027 |
| KTM | 150 EXC | 2020-2023 |
| KTM | 250 EXC | 2019-2026 |
| KTM | 250 EXC-F | 2011-2019, 2022-2027 |
| KTM | 250 SX | 2022-2027 |
| KTM | 250 SX-F | 2011-2027 |
| KTM | 250 XC | 2022-2027 |
| KTM | 250 XC-F | 2022-2027 |
| KTM | 250 XC-W | 2022-2027 |
| KTM | 300 EXC | 2019-2027 |
| KTM | 300 SX | 2023-2027 |
| KTM | 300 XC | 2022-2027 |
| KTM | 300 XC-W | 2022-2027 |
| KTM | 350 EXC-F | 2012-2027 |
| KTM | 350 SX-F | 2022-2027 |
| KTM | 350 XC-F | 2022-2027 |
| KTM | 450 EXC | 2009-2016 |
| KTM | 450 EXC-F | 2017-2027 |
| KTM | 450 RALLY | 2022-2026 |
| KTM | 450 SMR | 2022-2026 |
| KTM | 450 SX-F | 2009-2027 |
| KTM | 450 XC-F | 2022-2027 |
| KTM | 450 XCF-W | 2023-2027 |
| KTM | 500 EXC-F | 2022-2027 |
Product details
RFX Race Series start buttons are made to replace the OEM part exactly. Each one comes with the same couplings, fasteners and connectors as the genuine part, and the cable lengths match it exactly.
Key features
- Made for a wide range of bikes
- OEM replacement
- Takes all the original connectors
- Cable length matches OEM
Fitting instructions
- Take off the front number plate.
- Carefully cut the cable ties that secure the start and stop switch wiring to the handlebars, then unscrew the clamps and leave the switches hanging.
- Find the switch connector on the bike. It is often found near the headstock on the chassis, but can sometimes be under the tank.
- Release the connector clip and remove the old switch, noting how its wiring is routed.
- Clean the connector with a contact cleaner, for example Maxima Electrical Contact Cleaner.
- Fit the new switch loosely to the handlebars where you want it.
- Route the new wiring along the same path as the old switch, then clip the two halves of the connector together.
- Turn the bars fully in each direction to check the wires have enough free play and do not pull tight. Adjust if needed.
- Where possible, refit cable ties to the wiring, keeping the cables behind the bars so roost cannot damage them.
- Put your number plate back on.
Questions about this part
Will the RFX Race Start Button KTM All Elec Start Model 250-530 fit my bike?
It is listed for 65 models, including GasGas EC 125 (2025), GasGas EC 250 (2021-2026), GasGas EC 250 F (2021-2026), GasGas EC 300 (2022-2026). The full list is in the "Fits these bikes" table on this page, and the fit check next to the price tells you straight away for your saved bike.
What is the part number?
The manufacturer part number is FXKB 50900 55ST. Our stock code is 111431.
How much is delivery?
Order before 3pm for same day dispatch. UK Next Day delivery is £7.99, and free on orders of £100 or more. Pre 12:00 (£9.99) and Pre 10:00 (£14.99) upgrades are charged at any order value.
Can I return it?
Yes. You can return it within 30 days of delivery for a refund. You pay the return postage unless the item is faulty, damaged or wrong, in which case we cover it. See our Returns page for how. Returns