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Re: will main clutch casing fit yz 125 2001 from 1997?
Hey Ryan! Long time since hearing from you.
When you say "main clutch casing" do you mean the right side cover for the gearbox or do you mean the primary driven gear (AKA "clutch basket") that the clutch boss (AKA "clutch hub") and all the clutch plates fit into?
If you mean the right outer casing > they are slightly different, '97 pn 4JY-15431-10-00 and 2001 pn 4JY-15431-12-00. The entire clutch is the same from 1997 through 2001.
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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.
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.