Reply To: My motorcycle loses power at high RPMs and full throttle – Hyosung GTR
Hi, Uvcmn. my GT250R has similar problems to yours – not as bad.
I haven’t totally fixed it but it runs better than when i bought it. My plugs were a bit sooty and the exhaust is sooty.
My Front Cyclinder does not get as warm as the rear, ever. I can smell unburt fuel out the pipe.
I get FUEL on the AIR FILTER coming from Cylinder-1 Carby, i think.
And i get this horrible CUT-OFF of power when i have the throttle near fully open, (this cut-off used to be at 5000-6000 revs).
I still get the cut-off of power but it’s now at 9500-10000rpmw, which is a lot better.
Power completely cuts out while i’m on the gas and head down – it’s a bit scary & even more annoying.
I’ve not fixed the issue(s) but i guess my issue is with the CARBYS.
To IMPROVE the situation i changed all fuel lines, new fuel vacuum pump, bigger fuel filter, new spark plugs, new ignition coils & a new CDI unit.
I also bought a Voltge Regulator but it’s not installed yet.
I also added a strong FUEL SYSTEM CLEANER to the PETROL TANK, several times & gave the bike long runs at high revs.
Then i sprayed a bit of CRC Carby Cleaner into the INTAKE of the carbys. If you are taking the CARBS apart, you can spray this CRC all over the metal components.
This stuff eats paint but it’s amazing for cleaning the carbs – stonger than a brake cleaner.
All of that made the bike run much better but DIDN’T fix the cold front cyclinder or eliminate the power cut-out.
But it idles much better, runs much better & only cuts-out at the top of the rev range.
I will have to do my Carbs. I would love new carbys but i can buy half a Hyosung motorcycle for the same price.
If anyone finds out why the front cylinder is colder, i’d like to know. It doesn’t sit right with me – it’s not right.
Engines get hot, don’t they? 😆
-----LaserBeam---->