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Upgrade Regulator Rectifier [Reg Rec] :: GV GT 125 250 R GTR Hyosung

Name: Upgrade Regulator Rectifier [Reg Rec] :: GV GT 125 250 R GTR Hyosung
SKU: ZXREG-RACE
Availability: InStock
Rating: 5.00 (14 reviews)

Rated 5.00 out of 5 based on 14 customer ratings

14 reviews

£34.99

#Essential .
This uprated Regulator/Rectifier is a smart upgrade for older Hyosung bikes that came with the small grey OEM units, which are known to struggle under real-world conditions. It delivers steadier electrical power both when riding and idling cold, helping your bike warm up faster and run more reliably throughout the day.

Designed as a direct replacement, it offers improved build quality and a larger size for better heat dissipation — addressing many common issues reported with the original outsourced Hyosung parts. While Hyosung updated their carburetted models’ regulators over time, owners still found faults later on.
⚡ Want a better regulator for your Hyosung? This is a no-brainer upgrade.

⬇️ Full details below!…

Description

Uprated Regulator Rectifier — Hyosung GV / GT / GTR 125 & 250 (Carb)

#Special Order for Carby Models Only

A reliable regulator rectifier is central to a healthy charging system — it stabilises voltage, protects your battery, and reduces stress on the stator (the generator).
Hyosung’s small silver OEM units have a well-known history of running hot and occasionally failing (there was even a small recall on early silver types). The uprated unit here is a direct-fit replacement that uses improved internals and a larger heatsink to run cooler and deliver steadier output.

❄ Runs Cooler Large heatsink & improved cooling	⚡ Stable Voltage Less strain on battery & stator
🔌 Plug & Play Uses OEM connector + correct polarity	💡 More Consistent Lighting Fewer dimming issues at low revs
🛠 Reliable Upgrade Better components than many stock units	✔ Peace of Mind Reduces common charging faults

This is not a “bigger is always better” claim — it’s an honest upgrade: improved thermal design and modern components designed to last longer than many OEM regulators. A good regulator protects the entire charging system — if the regulator fails it can overwork the stator, flatten the battery, and cause flickering or dim lights. Replacing a suspect OEM regulator early can save you a bigger electrical repair later.

Customer proof: We include running clips and gallery photos from customers who have fitted these units — take a look at the pictures to see real-world mounting examples and orientation tips.

🚚 UK Stock:
Typically 3–5 working days (Royal Mail)

🔧 Fitting Notes	🏍 Model Fitment
This uprated regulator is larger than the tiny OEM units — it often needs creative mounting (bracket, sideways mount, or under-tray). See our gallery for ideas. Connector orientation matters (see the black box below).	GTR 125 & 250 — All carburettor models GT 125 & 250 — All carburettor models GV125 — Up to 2018 (carb models) GV250 — Carb models (all years)

⚠ IMPORTANT FITTING NOTE — READ THIS BEFORE YOU BUY

The uprated regulator is physically larger than the OEM unit. Be creative with mounting — sideways or under-tray mounting often works best to get airflow across the heatsink.
Connector orientation is critical: the plug must face down or towards the rear wheel (not up or forward).

Do not have the plug facing the sky — standing water and rain will make ingress more likely.
Do not face the connector forward towards the front tyre — spray from the road will hit the plug directly in wet UK weather.

We photographed and published several customer installs — check the product gallery and customer photos to visualise correct mounting and connector direction before you fit.

🔧 Install Tips & Care (Read Before Fitting)

Plan your mount: measure clearances before you start — this unit is larger than stock and often needs a bracket or relocation plate.
Connector faces down/rear: ensure the connector is pointing downwards or towards the rear wheel to avoid water ingress. Route the cable so it is protected from stones and tyre spray.
Support the regulator: use rubber-lined clamps or a cushioned bracket to avoid vibration fatigue on the case and wiring.
Seal electrical joins: where you need to extend or replace wiring, use waterproof butt connectors and heat-shrink, or liquid electrical tape for extra protection.
Check polarity & plugs: our unit uses the OEM plug pattern and correct polarity, but double-check connections before powering up.
Test before finalising: after fitting, start the bike and check DC voltage across the battery: ~13.5–14.5V at normal running revs is expected. If you see unstable or high readings, disconnect and check wiring immediately.
Inspect after 50–100 miles: re-check mountings, connectors and wiring routing for movement or wear.
Gallery reference: if you’re unsure how to orient the unit, look at the customer photos in the product gallery — these show several successful mounting examples and the correct connector orientation.

Need help? Visit our gallery and video links on the product page — many customers fitted these themselves and shared pictures/clips. If you still need advice, contact us and we’ll point you to the most relevant photos or suggest mounting ideas for your model.

Note: This listing is for carburettor (Carby) models only. EFI/250 EFI customers — please see our separate EFI regulator listing to get the correct unit for your bike.

📽 Customer Running Videos

SKU: ZXREG-RACE Categories: ⚙️ Performance Kits, ⚙️ Service & Maintenance, ⚙️ GT125/GT125R, ⚙️ GT250 / GT250R, ⚙️ GV125, ⚙️ GV250, ⚙️ GV250-EFi Tags: 125, 250, gt, gtr, gv, oil, performance, plug & play kits, rectirifier, regulator

Additional information

Weight	1.1 kg
Dimensions	20 × 20 × 5 cm

14 reviews for Upgrade Regulator Rectifier [Reg Rec] :: GV GT 125 250 R GTR Hyosung

Rated 5 out of 5

Peter (verified owner) – Oct 23, 2018

On this regulator bike working much better , no problem with idle.
Thanks Marcel !!!
Rated 5 out of 5

shane (verified owner) – Nov 28, 2018

Only brought this since I’ve heard the stock ones on the bike aren’t that reliable
Rated 5 out of 5

Tom (verified owner) – Jan 17, 2019

This part is a must i have the coils the caps and irridium plugs and will be getting the stator and the bike is totally diffrent it start straight up from cold And it really seems to have a kick up its arse now and for the price it really is worth the money
Rated 5 out of 5

anthony harris (verified owner) – Mar 5, 2019

Iv only ordered this as the old ones are rubbish
Rated 5 out of 5

Martynas (verified owner) – May 24, 2019

Works perfectly
Rated 5 out of 5

Barry white (verified owner) – Dec 1, 2019

Got my Regulator rectifier as promised on time today very fast and reliable service will be ordering again and a big shout out to Marcel who has helped talk me through it all will post pics on hyosung website thanks
Rated 5 out of 5

Karl – Feb 22, 2020

Very good piece of kit. Had to replace my whole electrics so this made sense to go with new stator that my old electrics fried.
Very quick delivery and superb service. Will definitely purchase more items from here. Much better stuff than stock
Rated 5 out of 5

Jed (verified owner) – Jun 6, 2020

Erratic idle fixed works great cheers!
Rated 5 out of 5

Torbjorn Wold-Hansen – Jun 17, 2020

This is an absolute must have for your Hyosung! Had it for around one year now, and it works great.
Rated 5 out of 5

micky m (verified owner) – Feb 1, 2021

received my upgraded regulator from marcel today for my gt250r fantastic quality ,great service highly recommended micky m blackheath
Rated 5 out of 5

Martin – Jul 18, 2021

Erratic idling completely sorted now I have replaced this. Excellent advice from Marcel as always, would recommend this to any GV125 riders
Rated 5 out of 5

eman ellul – May 26, 2022

Just upgraded to the uprated coils, the uprated regulator, the uprated stator and ngk caps with iridium spark plugs. I have to say it made an amazing difference, the bike almost no longer needs choke (less than a minute and only on first start in the morning), acceleration has improved significantly and my bike is now charging (which was my original problem :p). Very happy with all items 🙂
Bike is a 2003 gv250 carby model
Rated 5 out of 5

Chad (verified owner) – Apr 19, 2023

Arrived super fast. Plugged in my 125p started the engine, took it out for a ride, amazing indeed, instant noticeable improvement to start up, idle, throttle response 🤗 perfect.
Thanks.
Rated 5 out of 5

Reiss (verified owner) – Apr 11, 2024

Installed to my Hyosung GT125R, immediately noticed the dashboard lights are much brighter, the head lamp is brighter, it starts quicker and generally feels a lot smoother to ride. Cannot recommend it enough.

Thank you. 🙏