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1. Remove the timing chain and the chain tensioning
plate, and then remove the balancing active tooth
locking nut and active tooth locking nut washer
respectively
；
2. Remove crank shaft timing active sprocket and
balance active gear;
3. remove the balance driven tooth lock nut and
CB125 clutch disc washer ;
4, remove the balance tooth driven wheel, NC250 the
crankshaft sleeve, balance shaft flat key.
Removal of oil pump for left body machine
1. Remove 3 pcs of GB/T16674 small plate bolts
M5×10 that fasten the cover plate of the left machine oil
pump.
2. Remove the oil pump cover plate, remove the left
oil pump rotor assembly, oil pump pin should be
properly kept to avoid loss.
Inspection of left crankcase cover
Check that if the balance shaft oil seal of the left crankcase cover is damaged. If any, the balance shaft oil seal must
be replaced.
Inspection of magnetic motor stator and rotor
1.
Check if there are cracks or breakage of the magnetic tile of the magneto stator, if any, the new magneto rotor
should be replaced.
2. Check if the magneto rotor is worn or damaged, and replace the new magneto rotor if any.
Inspection of main and driven gear
Check if the balance main and driven gears is worn or damaged.
