Will main clutch casing fit yz 125 2001 from 1997?

Try the 1990 YZ 80 factory replacement part. That's the only one that will do the job right.

Were you riding it when it jammed because that could mean the that something is sized inside the motor, like the crank or the pistion

I think you mean that the clutch has a broken cable and it is constantly engaged. The clutch dis-engages from the gear box when the clutch lever is pulled in. The push lever axle (I think this is what you are calling the main shaft) sits in a hole on the side cover. The gear on the axle engages the push rod and the push rod separates the clutch plates by pushing on the pressure plate to dis -engage the transmission. If the axle shaft is loose, check the lock bolt. Also check the cover plate. Is the casing cracked or broken at the mounting point?

If you are calling the push rod "the main shaft", then some movement is normal when the clutch is engaged as would happen with a broken cable. Please rate my answer. Thanks.

Remove gearlever,drain gearbox oil,drain coolant,remove powervalve actuator cover,place small allen key in slot provided & remove bolt on actuator,remove radiator to waterpump hoses,remove clutch cover,slide shaft out from left to right,(If clutch hub is in the way remove clutch assembly),fit new shaft ,reassemble,replace gearbox oil & coolant & bobs ya uncle.

There should be a small bracket that sits over the actuator arm and is screwed into the cases. This is what holds it in place and keeps it from popping up

YOU MIGHT BE BETTER OFF RINGING A YAMAHA BIKE SHOP... THEY WILL BE ABLE TO TELL YOU IF IT WILL FIT...

It could be a lot of things but most likely is the clutch main basket.The sprocket attached to it uses springs to absorb the torque from the crankshaft.Those springs work against aluminum hubs witch can wear off very easy.

if you know how to split your case, take the broken case to an engeneering shop that can can do alloy tig welding and get it welded

Hey Ryan! Google " motorcycle tires " and you should be able to find the 120/80/19 tires. Call the dealer for additional sizes that will fit.

Please rate this solution. Thanks!

P.S. > Did you ever get the clutch fixed?