Dirt Bike Repair & Maintenance Forum

Hi i own a ktm 125 sx and my bike is starting to   idle in higher rpm's to keep it running.  The bike won't idle in first gear without stalling unless i crank the idle up but then it will be to high to put it into neutral.  I cleaned the carb, put the right jetting, and put a new air filter on it. Is this a sign to rebuild the top end? or is something else wrong with the bike?  

I also just started using castor927 premix oil.  

Have you tried adjusting the idle screw?  
- 1992 Suzuki RM 125
- 1979 Yamaha Townmate 80

Ya i have, i do it when its warmed up.  I move it just the tiniest amount and its either to high or to low.  

Hmmm, sounds like you need the Jet-i! lol

Skip....  
- 1992 Suzuki RM 125
- 1979 Yamaha Townmate 80

What do you mean the idle is too high to put in neutral? Can you shift into neutral or do the rpm's continue to rise while it's in neutral?  

But surely Chud if he had the clutch in it would not make any difference?  
- 1992 Suzuki RM 125
- 1979 Yamaha Townmate 80

Idle Screw or Jetting  
Thumpers4Ever
2007 CRF150F
2002 DRZ400E

it seems that when the rpm's are high with the clutch in its alot harder to put it into neutral.  

i have a 1987 Honda CR125 and im having the same problem with my idle. il start it up in nuetral and i have to keep pulling on the throttle so i wont kill the engine. i dont know how to fix the problem..any help???