Observe that the thicker distance should be at the clutch end. That is because the mainshaft ledge must putrode further out than the sprocket gear and its nut. If not, the kicker ratchet spring washer will drag on the nut, the friction prevents the spring and kicker gear from spin with the mainshaft and that will make a lot of ratcheting noice, the kicker will not return freely when the engine has started. Check that the cupped washer is hardened or it will rapidly wear a groove by the ledge and will drag. If the washer isn't hardened, wear can be prevented with a ring or a turn cut off a coil spring, on the shaft before the washer. Even better if you can fixate the ring on the washer, pin or solder.
For smooth kicker function, don't forget to drip a drop of oil now and then through the small hole in the chaincover, the chain grease and oil thrown about does not reach the end of the mainshaft with ratchet and kicker gear.
