Honda CBR125R Owner's Manual page 280

CRANKSHAFT/BALANCER/TRANSMISSION
Clean the left and right crankcase mating surfaces
thoroughly, being careful not to damage them and
check for damage.
Apply a light but thorough coating of sealant
(TB1215 or equivalent) to left crankcase mating
surfaceexcept the oil passage area.
Install the dowel pins.
Install the left crankcase on the right crankcase,
Do not force the
being careful not to damage the oil seal lips.
crankcase halves
together, If there is
excessive force
required,
something is
wrong. Remove the
left crankcase and
check for
misaligned parts.
Install the right crankcase bolts and washer, and
tighten the bolts in a crisscross pattern in 2 or 3
steps.
Connect the crankcase breather hose.
12-22
DOWEL PINS
RIGHT CRANKCASE
BREATHER HOSE
BOLTS
PASSAGE
LEFT CRANKCASE
BOLT/WASHER