Idling – GV125C

[Callum Hutchinson]

Anyone know how to adjust idle, bike doenst idle and takes ages for the revs to come down, so I turned the idle screw down and it’s sorted the over revving issue but now doesn’t hold idle 🤷‍♀️

[♠️ MARCEL]

The Idle adjustment is on the carb itself or it will have an extended cable dangling between the coil cover and left engine crank cover.

if the revs are slow to climb down , it is commonly these  (all or one of them, guaranteed)

• Carb is clogged, needs air compressor or ultrasonic cleaning
  (It has many holes inside)
• Jets inside the carb are also clogged
• Bad E10 fuel ?   (If you have E10 fuel, drain it and use E5 forever.)
  (E10 will kill the 125cc one way or another , modern cars made for E10 are still better on E5)
• Inlet Manifolds have splits or leaking air thru a big crack?
  (Spray carb cleaner there and if revs change,  i was correct.)
• AirBOX is not sitting properly
  (air leaks and the carbs are CV, they need a fully sealed up intake system to function right)
  ____
• Inlet Manifold  “O-RINGS” have caked up, allowing air in  (click here for visual look) 

  Click here again, for a quick tutorial on how to carefully remove the airbox out of the carb
  ___

• Clean your spark plugs
  If they are already acting funny or you ain’t sure they are not breaking down
  Go halfords and get fresh CR8E
  Even if the old plugs work, put them on shelf as backup.
  Then start using new ones from here.
  The carb mixture is good when it says “all brown” on the plug
  (Post picture of plugs sideways and center and top down , so we see how rich they are)

  Jetting Tutorial?  click here 

 

Do each bullet point above first, before you try other parts of the bike , you want to get the above ^ out of the way first.

Then report back as you progress each stage. 🙂

Good luck!

// Meditation doesn't mean you have to sit still....

[Alan McLean]

I had very similar symptoms with mine and after checking everything as suggested by Marcel it turned out to be the manifold O rings.

[Author]

Posts