Hyosung rx 125 top end issues?

[Le126]

I recentley bought a hyosung rx 125 and today when riding it developed a loud constant clicking sound valves? It then began to smoke which makes me think the valve seals were gone
After about half an hour of clicking the engine made a loud grinding /crunch sound and wouldnt start again
Any thoughts what might of happend and what will need replacing
Thanks

[P.addy]

The engine.

[MattWadz]

yeah, as paddy said probably best to source a second hand engine, be much easier to just straight swap it, unless your on a low budget, but still doesnt sound great!


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Pitbike x2, Mini Moto x4, China Quad, 02' Suzuki AP50 > 03' MBK Nitro > 86' Suzuki GP100 > 02' Yamaha Jog R > 57' Honda Lead 100 > 95' Piaggio ZIP Rst 50 > 51' Suzuki TS50x > 83' Honda CB125TDE Twin > 51' Yamaha Aerox > 98' Kawasaki KX60 > 89' Yamaha DT50MX > 80's Honda QR50 > 05' CG clone > 125cc China Pitbike > 91' Honda MTX125 RW-L > 09' Peugeot Speedfight 2 LC LR > Lucky MX 140cc > Apache Tomahawk 50 Quad (current = 2010 Yamaha WR125R

[P.addy]

[Le126]

Cant seem to find a replacement hyosung engine anywhere and its about £80 for the 4 valves springs and seals And another £40 for piston and ring kit but im going to have to get it stripped and checked first as it would be a waste of money if its got a shagged bottom end but the tapping was definately a top end sound , hopefully it is the valves as i cant find a replacement engine for this bike but there is a similar engine for £350 brand new but just doesnt seem worth it....
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L.e

[Gazz]

I recently just found out that Hyosung make a 400cc for the RX. Never seen one before but apparently they do make them. Also the RX is similar to a Suzuki DR-Z, so you might be able to fit one of these engines (125 or 400) if you are unable to source a Hyosung one.

Coincidentally, my RX125 has made a knocking sound since new - on start up, but goes away once the engine is warm. Sounds to be top end too.

[MattWadz]

Isnt it a Suzuki DR125 clone engine?
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Pitbike x2, Mini Moto x4, China Quad, 02' Suzuki AP50 > 03' MBK Nitro > 86' Suzuki GP100 > 02' Yamaha Jog R > 57' Honda Lead 100 > 95' Piaggio ZIP Rst 50 > 51' Suzuki TS50x > 83' Honda CB125TDE Twin > 51' Yamaha Aerox > 98' Kawasaki KX60 > 89' Yamaha DT50MX > 80's Honda QR50 > 05' CG clone > 125cc China Pitbike > 91' Honda MTX125 RW-L > 09' Peugeot Speedfight 2 LC LR > Lucky MX 140cc > Apache Tomahawk 50 Quad (current = 2010 Yamaha WR125R

[Le126]

Yes it is a clone engine and the bike would also make the sound on startup for a few seconds then go away but then it became constant and the bike began to smoke until it eventually made the crunch sound and wouldnt start again
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L.e

[Gazz]

Hyosung engines are made of chocolate.

I once had a GT650R that only lasted 6000 miles and stranded me in the Czech Republic.

Probably best if you could get a Suzuki engine fitted.