♠️ MARCEL

In my comments above ^ = Read it and let me know if the sprag clutch is working by testing with your hand and tell me what the BIG sprocket behind the flywheel is doing when you spin both ways

And which direction is it spinning (towards front or towards rear)

And which direction does it refuse to spin   (towards front or towards rear)

Let’s j…[Read more]

Which Hyosung is this ?  Becareful some sites are very sketchy with no real association with KR Motors Korea (Real Hyosung)  but they buy their own stuff and store in a shipping container yard!

anyway,   if its SILVER and says “TCTC” on it , it is the same caliper used on front & rear for the GT250R before 2012

After 2012 = All GT250/650R use…[Read more]

The caliper is used on the 650cc, that should tell you that it’s more than sufficient for a 250cc motor and you have 2 discs also which is a luxury as most 250cc bikes only have a single sided caliper and disc x1.

So improving it would require these:

• Braided Goodridge UK/Hel lines, you want a proper motorsport brake line.
• Stainless Pistons …

[Read more]

Just make sure you looik at your flywheel starting system cause if a part is damaged , it could flow loose inside motor and damage something else like a loose tooth!  This will save you damaging another starter motor.

If we sort the crank first ,  then starter motor ,  and now we can move on to engine and electrics and fuel system using my co…[Read more]

You can go to halfords and get CR8E as that is the OEM plug for every Hyosung sold since 1999 , so always stick with CR8E no matter what.

Also, while there, ask then for a spark plug tool that fits CR8E plug , get more than 1 tool,  incase Tool #1 is being awkward in the frame ,  get Tool #2 that may be shaped different to avoid hitting the f…[Read more]

Sounds like you need to drain the oil out entirely  (grab fresh one and fresh oil filter)

Next , go to the stator cover , remove it carefully and SLOWLY (the flywheel has a strong magnet) , so it might try to pull the case back in and also there is a “STARTER Motor SPROCKET” idler gear   (looks like this)

Then once the cover is off  (don’t for…[Read more]

A healthy fuel pump will always make a “whirring” sound as it stays continously on until you switch the bike off. Even as you turn the key on it makes that “whirr” sound.

try JB Weld High Temp Epoxy

That’s a lot!

– How about we do this to stop any hydrolocking issues as that would mean a big disaster later!

• Remove the fuel and vacuum line going to the “TAP” on the tank , GET A BUCKET! , if fuel pours out….even a drip drip
  Replace the tap!
• If not, but when you crank the bike, with throttle closed (don’t touch throttle), fuel is…

[Read more]

Keep us posted, Simon knows his EFi babies inside and out lol, so follow what he says!

Topic locked as its a duplicate. Ill respond to your other one here

GT125R Cold Weather Death

Then i would assume you have faulty coils ?

Swap the front and rear coils ?

If that’s true, it time to get a new coil  and probably new spark plug caps  (as yes the coils can kill them)  –  NGK ones are too recommended,

Since these bikes came out of the factory we always get orders for the rear coil and pair of plug caps.   The rear coil fails…[Read more]

Hey
Check this topic,  just incase it is the idle speed controller having a loose/damage o-ring like this guy found out below:

GV125s idle speed when hot

Also try the cleaner mentioned in the topic above to clean out the fuel system
Keep us posted

Try the Vulcan 800 ones, the worst case is just a bit of metal work to shave some off the metal to slot in to the bike rearset?

In honesty, the Daewoo ECU is problematic , thats why not community investment was made to attempt to mess with it on a large scale , and the only tool that can reliably Read the ECU is  “Hyosung Scan Tool”,  you could ask local dealer in your country to buy one as Hyosung sells it to Hyosung dealers only.   I believe  Delphi is a better syst…[Read more]

im not sure 100% but look at “Vulcan 800” foot pegs, they may “just about” fit but again this is the closest bike i can think of

or try Vulcan 800 footboards    (footboards are way more comfy than pegs i wont lie lol)

Winter Time  (under 15 *C temps in the air) , basically cold days = 10w40 is fine. I would get Silkolene Pro 4 or Comp 4

Actually find any oil that has ESTER  (that’s usually Silkolene Pro 4 or Comp 4) or (Motul 7100 , 300V)

Fully synth is  best.

10w30 is too thin, it will break down faster than a 10w40 would.

Personally i prefer to use Mo…[Read more]

Contact us here , we might try to rapidly get one for you , please confirm in the email it is a “SEAL” as we can’t return parts to the factory if it was incorrectly ordered (ie your mechanic gave false info).

Contact

oooooh i see!

– Take your time,  get your friend to take a nice clear picture of it again without zooming with his finger or screwdriver pointing at it.

I hope a rock didn’t try to pop the casing!