Reply To: Slow running carburettor stabilise
The idle should 1,000-1,200 ice cold if the engine compression is good, Carb is good , and valve clearances are not tight, electrics are OK (click here) , then of course let the bike idle for 10mins, it will nicely climb up to 1500rpm
Hyosung says it should be 1500 rpm when hot (I would recommend 1600-1700 rpm hot as that is best IMO , however don’t exceed 1800 rpm. If you idle over 2100 rpm all day for example, you will find that the engine heats up too fast and may slowly burn a hole in the piston)
Sometimes idling issues could just mean air leaks , so you will spray carb cleaner on the intake pipes and see if revs change or maybe you need fresh intake o-rings (like these ones) , most people don’t think O-rings are important on the intake side but on the 125cc it matters a big deal.
Hope that helps!