I have a 1994 yz125, when I pull the clutch leaver in it won't spring back.I thought it might be the clutch cable so I got a new one but it still does the same thing. how do I fix this?

are you refering to the clutch fork that connects to the other end of the clutch cable, you will have to drop the gear box as this fork sits over the clutch pressure plate ,and pushes the thrust bearing against the pressure plate tynes so disengages the drive from engine to gearbox, while you've got the box out check the condition of the clutch parts ie thrust bearing,pressure plate spring's,friction plate condition

Check the spring to see if it has snapped anywhere within it's coil.

Remove the cable and check operation of the pedal and spring mechanism.
If all is well, then with a lever, check that the clutch release arm on the gearbox is operational. If that is also sticking, then you will have to remove the gearbox to investigate further.
If not sticking, then also remove the clutch cable outer sleeve, and replace.

Good news, you just need adjust the clutch cable..

Always order the part for your model and year when getting parts and make sure it matches in length with the old one. Note how much cable is sticking out of the housing.
Is it 3 1/2 inches or 4 inches or 2 inches. make sure the new one matches.

Put the new cable on with lots of slack.Slack at the adjuster, and slack at the handlebar adjuster
Now pull the lever in, it will be easy because of the slack.let it stay there.
It will stay against the grip.
As you tighten the cable adjustment down by the cover, you'll notice the clutch lever move out.
Once it reaches the top, stop adjusting and pull it in again.
Continue adjusting and pulling the lever until the lever springs back to the top.
You can feel resistence which is the clutches disengaging.
Make sure there is 1/8" free play when the lever springs back.
Now turn the clutch cable adjust on the handlebar outward, which will remove the rest of the slack.
Only leave 2mm slack on the lever.

Now start your bike up and it should work like new.
You want your clutch to disengage within the first 1/2" of pulling the lever in.
This ensures the clutches are definately disengaged by the time you get the lever pulled back to the grip when shifting.

If your clutches are slipping or dragging no matter how you adjust the cable then your clutches may need replaced.
But sounds to me like its just an adjustment.
Hope to be helpful
Big Al

Tap on the hood while somebody else pulls the leaver, try pulling up on it to. If this does not work you will have to try to gain access to the hood latch and pull the leaver where the cable is attached to open the hood. The cable may be stretched or broke.

If it is a hydraulic clutch, i would continue to squeeze handle to build up pressure. If it is only a cable clutch, Re-check your clutch springs that you should have replaced. They should not be all in the same direction.

If you can see the actuator moving, but not disengaging the clutch, it usually means that the clutches are hanging up in the basket, or the actuator is bad and not releasing the clutches. The only way to tell is to take off the clutch cover and watch what happens when you pull the clutch.

It is an pretty easy fix. Remove the right case cover and then loosen or remove the bolts that are compressing the clutch springs. Now slide the push rod 1/4" into the engine from the left side. Remount the lever assembly into the casing and put the casing back on. Now re-tighten the springs and put the right case cover back on. Re-fill with oil. All fixed.

A “very helpful” rating for this answer? Thanks!

With out pulling in you clutch I can't tell you if it is a normal pull or not. You can buy an easy pull ball and ramp for your clutch, or start working out your grip with a tennis ball.

change the clutch basket and buy a new cable they get stretched out and the basket gets worn severly

Your clutch is not fully disengaging.Adjust the cable at the lever until you have plenty of free play.Then adjust the cable at the motor until you have full engagement then readjust lever to 3/8 in play.Fine tune at the motor.It may take a few trys but you can get it.