RS125 Idling Issues

[sinedtomuch]

After fixing all my other problems on my bike another one seems to have cropped up.

When I start the engine (first time now wooo) it idles at 3-4k rmp even while warmed but if I hold the bite it drops to normal rev range. Also pulling the clutch whilst in neutral or in gear the revs go to around 5-6k.

Not sure whats causing this, any thoughts?

[nathan k]

I'd start with these two:
High idle speed? I'm not sure what carb you have but normally the center screw is the idle speed, turn it out to lower the speed.

Snagged throttle cable? Turn your bars full lock left and right to see if it's getting caught.

[sinedtomuch]

The idle screw seems to do nothing. Its the 28mm carb. Nothing is caught when full locked left either

[P.addy]

If the idle screw does nothing, maybe its not the idle screw.

But no, cracked inlet? Your idle should be 1400 when warm and about 3k on choke.

[nathan k]

[sinedtomuch]

Choke doesn't work, choke stalls the engine when engaged. So choke is always off.

Inlet manifold is 100% leak free, air filter is securely clamped on and so is carb

[P.addy]

Then something is obviously fucked... choke should be required in the cold weather. My RS would not start unless it was on full choke in 5 degree weather.

[sinedtomuch]

Mine started first time this morning no choke but it does concern me as to why the choke stalls the engine. Too large pilot jet perhaps? Haven't looked at this yet as the previous owner was a bit of a tool and had a 145 main jet on a 28mm carb

[sinedtomuch]

reseated the carb and air filter, seems fixed. But it takes a while to drop from 3-4k revs back down to 2k if I'm sitting at a set of lights.

[P.addy]

Might be running lean..

[sinedtomuch]

It seems to be all fixed now, I loosened the throttle cable slightly as I must have over tightened it when I changed the grips