Reply To: My motorcycle loses power at high RPMs and full throttle – Hyosung GTR
should I change the needle jets on the carburetors? Because in the manual, I see that for the 250 and 125 they are different.
See this link (click here for tutorial) , and if you want new needles (click here for shop link)
Also you should use 250cc slides (click here to see 250cc slides) , because 250cc slides were different from 125cc
The spark plugs now are new CR8E, I’ve ridden 150 km today, I’ll take them out and upload a photo. This might take a bit because I’m a bit busy this week.
No rush! Just take it easy with her 😉
If the float needles aren’t working, the fuel filter should lower the level when the bike is off, right? It doesn’t. Last week, I removed the airbox and the carburetors to change the spark plugs, and the intake manifolds weren’t wet with gasoline. The fuel filter only empties if I accelerate to the maximum. Do you then see it’s alright how I’ve connected the vacuum lines?
Okay, if you ride next time, go 5-10 miles at lower revs (steady cruising) = Look at your filter again and let us know if its half-full (50% or more IS OK)
We are justing making sure there is no internal carb leaks in the float seats (because float seats have O-Rings too) = slow leak in to engine sometimes.
Should I also change the main air jets to the 250 ones?
Not really, it should be fine but keep the carb cleaned as there is lots of holes inside.
This video is 100% explain how our carbs work, because it is a CV carb.