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To remove the fly wheel:
Loosen nut on fly wheel centre. Please note, it is a left hand thread. Turn nut
clock wise to loosen.
Pull flywheel with a wheel puller. You may have to put some heat on the
flywheel hub with a gas flame while under tension from the wheel puller.
To replace the main bearings:
Remove the entire cylinder barrel and pull upwards. The pistons will slide out
on bottom of cylinder.
Take end caps off and knock the drive side bearing from inside the sump.