Chinese Import 4 Stroke Scooter QMB139, Clutch Spring Upgrade

Do not confuse the clutch springs with the Contra Spring! This is a mistake that is often made. The Contra Spring simply opposes the Roller Weights and (in my experience) is best left as the stock spring, just fit lighter Roller Weights. Anyway, back to the changing the Clutch Springs;

1. Remove the Transmission Cover by undoing the 8mm retaining bolts that secure it. You will have to remove the kick starter first.
2. Undo the 13mm bolt that secures the clutch housing to the transmission drive shaft, this is best done using an impact wrench. You can now slide the bell housing and clutch assembly off the shaft.
3. You can now undo the larger nut that holds the clutch and rear variator cones together. I use a rubber filter wrench to stop the clutch turning whilst I undo the nut.
   
   TIP: As you undo the nut, the compressed Contra Spring will try and ping all the clutch components off, take care and note the position of all parts.
4. Once you have the clutch apart you will see the 3 small springs that pull the clutch plates inwards, replace these with a performance set of clutch springs and then put the scooter back together by reversing these steps.