I'm restoring a cb125J.
But am having some serious issues with jetting.
The engine is running so rich it's killing spark plugs.
What has already been done :
* Cleaned tank
* Changed fuel filters
* Cleaned carb (ultrasound bath) + rebuilt with official keyster kit (KH-0160)
* Changed gasket between engine flange and carb
* Checked timings
* Changed HT coil + condensor.
* Removed airbox for a cone
* Changed exhaust for slightly shorter "megaphone" type . (with silencer and fiberglass sheet, so that shouldn't change much).
Symptoms :
The engine runs, i can keep it idling with idle screw set almost at max.
I tryed moving the air/fuel screw to leaner, but it doesn't seem to make a differnence (whereas in plenty of videos you clearly hear rpm getting higher/lower).
I'm starting to think my carb is somehow broken, but i am finding very little documentation on this PD66A keihin carb.... (+ the engine mount is kinda particular).
I've ordered a colortune , hoping that might help a little, waiting for that badboy to arrive ...
Any one with experience on a S3 / J or N with this carb ? I'm pulling hairs at the moment ... And i'm seeing a couple of cry for helps with similar issues on the net, but no answers ...
Any advice would be good, even help in finding a compatible mikuni carb to fit.
But am having some serious issues with jetting.
The engine is running so rich it's killing spark plugs.
What has already been done :
* Cleaned tank
* Changed fuel filters
* Cleaned carb (ultrasound bath) + rebuilt with official keyster kit (KH-0160)
* Changed gasket between engine flange and carb
* Checked timings
* Changed HT coil + condensor.
* Removed airbox for a cone
* Changed exhaust for slightly shorter "megaphone" type . (with silencer and fiberglass sheet, so that shouldn't change much).
Symptoms :
The engine runs, i can keep it idling with idle screw set almost at max.
I tryed moving the air/fuel screw to leaner, but it doesn't seem to make a differnence (whereas in plenty of videos you clearly hear rpm getting higher/lower).
I'm starting to think my carb is somehow broken, but i am finding very little documentation on this PD66A keihin carb.... (+ the engine mount is kinda particular).
I've ordered a colortune , hoping that might help a little, waiting for that badboy to arrive ...
Any one with experience on a S3 / J or N with this carb ? I'm pulling hairs at the moment ... And i'm seeing a couple of cry for helps with similar issues on the net, but no answers ...
Any advice would be good, even help in finding a compatible mikuni carb to fit.