Open as PDF
7-10 ENGINE BOTTOM END/TRANSMISSION
Crankshaft, Connecting Rod
Split the crankcase (see Crankcase Splitting).
Remove the transmission shafts (see Transmission Shaft
Using a press, remove the crankshaft from the right
If the bearings stay on the crankshaft when splitting the
crankcase or removing the crankshaft from the right
crankcase, remove the bearings from the crankshaft with
a bearing puller [A] and adapter [B].
Special Tools - Bearing Puller: 57001-158
Bearing Puller Adapter: 57001-136
When installing the crankshaft bearings [B], apply high
temperature grease to the outer sides of the bearings,
and then press them into the crankcase using the bearing
driver [A] until the bearing bottoms against the step.
Position the crankcase half so that the main bearing hous-
ing is seated on a suitable press fixture.
Install the crankshaft bearing so that the sealed side in (to
the oil seal [C] side).
Special Tool - Bearing Driver Set: 57001-1129
Insert the crankshaft jig [A] between the crankshaft fly-
wheels opposite the connecting rod big end to protect
flywheel alignment as shown, and using a suitable tool
[B] on the left crankcase to press around the hole for the
When pressing, position the jig in the crankcase opening
so the jig does not hit the crankcase.
Special Tool - Crankshaft Jig: 57001-1439
Apply 2-stroke oil to the connecting rod big end bearing.
Since assembly of the crankshaft demands exacting tol-
erances, the disassembly and reassembly of the crankshaft
can only be done by a shop having the necessary tools and
If it should be necessary to disassemble the crankshaft,
use a press to remove the crankpin.
Since the assembly of the crankshaft demands exacting
tolerances, the disassembly and reassembly of the crank-
shaft can only be done by a shop having the necessary tools
Reassemble the crankshaft according to the standard tol-
erances in Specifications.
Connecting rod bend, twist
Connecting rod big end radial clearance.
Cold-fitting tolerance between crankpin and flywheels.
Side clearance between the connecting rod big end and
one of flywheels.