CUSTOMER REVIEWS

Bought for 2016 GT. Straight forward swap out. Bike feels better geared in all gears. No massive top end gains but worth it for the increased rideability!!

Bought and Installed on RC 2018. Excellent strength, the full kit that is provided is excellent value for money and much better than other providers. Sprocket especially is a great upgrade. Visually it looks great, I will aim to get some photos added to show final product.

Rt125d rider, have fitted this clutch an cannot recommend this enough. If you want one upgrade then it has to be this. The gears feel so strong and punchy. Pulling off at the lights is much nicer now with no clutch slip at all. Very easy install, if you have basic tools and the ability to use them then you can fit this yourself.

Works perfectly

Wow such a huge difference, finally changed this myself. Not too scary. Straight swap for old kit. Didn't even need a gasket. Much sharper gear changes and acceleration. I highly recommend. On a scale of 1 to 10 it's about a 6 in mechanical knowledge. Remember to soak the plates and don't over tighten the bolts. It's a full oil change so have at least 2 litres handy

Bought a couple of weeks ago and finally fitted last week. Made a good improvement to gearing and acceleration.

Just had this fitted big difference good deleviery aswel

Upgraded the chain and sprockets on my GV 125 c, to the 520 chain, and what a difference it makes. From pulling away for the first time after fitting the differene was clear. Smoother and faster transference of power to the back wheel through the gears and fourth really does feel like fifth. Really happy with this feels like a new bike. Cheers Marcel 😛

MARCEL ROCKS! Not only is this kit is a must have upgrade for your bike, but the support and advice i've got from Marcel is amazing! You should now that this is my first motorcycle and I really love to make my hands dirty. I love my bike but the acceleration was a bit disappointing. I've read about a tooth more or less on the front or back sprocket, but i really didn't wanted to loose any top speed. It seemed to be one or the other (more acceleration <-> more top speed). I talked to my dealer about this, but I didn't find any help there. So I contacted Marcel. He sent me the kit and the delivery was very fast (I live in Belgium) Then came the moment of truth: would I be able to do the upgrade myself? I succeeded with easy with some remote support from Marcel over messenger. His reaction time was very fast and I didn't loose time with the procedure if i had a question. Many thanks for that Marcel. The day after the installation came the second moment of truth. Would this upgrade perform as advertised? In short: IT DID! The test ride with these sprockets / chain exceeded my expectations . The acceleration in gears 1-4 is superb now. In second gear i can pull up to 50km/h - in 3th to 70 km/h without going in the red range! The bike pulls really fast now. About the top speed, with original chain kit my top speed was 107km/h on a steep downhill. Now on a far less steep one i reached 119 on display and gps speed was 107 !!! Speed record easily broken.

Top Quality , improves performance and tickover.

Would recommend instant idle is better and easier starting and i have not noticed any bogging since installed well worth money

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

Ordered these from Norway. Fast delivery and fantastic support from the team. Bike start much easier and feels snappier in the throttle response. Fitted this together with NGK Caps and Iridium spark plugs.

This was my major upgrade on my GV125. I can't recommend this enough. Has greatly improved the performance, especially up hills.

If you are debating whether or not to get the 520 upgrade then the short answer is YES...get it. If you want to know why you should, continue reading...... I was unsure if the expense would be worth the investment, after all the GV125S in it's self is a decent cruiser and with the stock sprockets I could achieve 67 mph if the weather was on my side. I found it slow getting there all the same and at top end the bike would be hurting.....you could hear that she didn't like being redlined. I contacted Hyo Riders and Marcel was so helpful in arranging the upgrade I needed. Once fitted I noticed I was up to speed much, much faster than previous and the gearing and revs seem more in tune. I find that 4th can be a cruising gear....enough pull to get you along and when needed take you to 60 mph , I only really use 5th for when I'm on open carriageways. I have achieved a top end speed with this conversion of 75 MPH and considering I am 12 1/2 stone , the bike has panniers and a topbox and I am fully kitted when riding, I think that is impressive from a upgrade. At this stage I'm sure I have covered most of what is needed to know.....and in fairness , the promises made as to what this 520 upgrade would deliver have been spot on. Well done Hyosung Riders 10/10. Again a big thank you to Marcel for all his help in this, you are a star....

Bought these EGR blanking plates the other week and they look spot on, were delivered quick too. I'll upload a picture once I've rebuilt the engine. Cheers

Big shoutout to marcel for the coils, ordered and delivered in 3days all in time for the new year, also went for a 3hour ride after fitting them along with a service of course and she’s not skipping a beat no more 😁 definitely recommend for anyone on the search for parts

Really is lightweight , and looks great , another fair priced and quickly delivered product

Lot better than the original one’s, easy to change and look good.

Where do I start? The beginning I guess 😉 I bought this Beauty, a GV125-S last Month and was not happy with the Power and acceleration, or should I say missing Power of the 14 PS compared to my last ride a Yamaha XV 125 with 11 PS. Dont get me wrong I noticed the difference, but she was just laggy, screaming at me, and the Vibrations when going above 8000 Revs. In 5th gear she hit 10-11000 revs and just stopped power wise, not going any faster than 105 Km/h on the dial. In the German Group on Facebook it was suggested to upgrade the front Sprocket to one with 15 teeth, which I did, She run a little smoother through the Gears and the Engine sounded a bit quieter and wasnt screaming at me, but the loss in Power in the lower Gears, especially going from 2nd to 3rd, and the Top speed of 110 Km/h, which took me ages to get there, wasnt satisfactory, taking her up into the Red again to get here.. Then I saw Marcels post in that Group and decided to buy this Upgrade from the UK and have it shipped to Germany, thanks to Marcel here for the support. What can I say? I took her out on a 3 Hour ride to test, what a difference! The smaller front Sprocket (13) and the Larger Rear Sprocket (Dimension) and 520 Chain is the perfect combination. She shoots up through the Gears, no Jerking, no screaming Engine, next to no Vibrations, just smooth and fast, at 9-10000 Revs in 4th Gear she hits 100 Km/h and in 5th I had her at 120 Km/h and felt like there was still more .... plus it was a windy day 😉 I also ordered the NGK Spark plugs and HT leads which just finishes off a perfect combination. Thanks Marcel and Team, Season nears its end and I just cant wait to get out there next year, the Bike is so much fun now and I dont miss my Yamaha at all 😉

Look the mutts nuts , and Marcel had them delivered quickly

Just upgraded to these 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 🙂

Nice shiny upgrade to the stock bearings especially after the road salt and conditions have helped my old one's to bind slightly. They feel great and didn't take much fitting very happy.

Easy simple fit.

An absolute must have, making life a lot easier to work on your engine.

Great item fast delivery just what I needed for my bike to get it through its mot thanks

Fantastic items a must have for anyone my gt125r now does not miss a beat

i would recommend getting it has given my bike a higher top speed and overall it is better than stock i have quite a few upgrades with this doh i have k&n air filter full black widow exhaust up jet performance coils and plugs and regulator bigger fuel lines and vac lines i would say this kit is worth the money also got to think about the time taken to develope the product finding out what fits what and what works on the bike

I have to agree to pretty much all Moustache Man has to say. Not had the chance to hit the motorway yet but was running up hill at 55 in fourth. Previously would have been struggling to sit on 50 uphill, I am bigger than average so it is to the bikes credit that it manages this :p.

What a great kit this is!! Delivery to belgium was very quick! I'm happy with the result. Don't have to shift as mutch as with the original chain. Lower revs and more accelaration. And a higher top speed. If you buy this kit you won't regret it!! Top notch! Thanks marcel!!! Greetz from belgium