Top End - Yamaha BR250F Service Manual

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D. Top End
This model has a one-piece cylinder and
cyl inder-head assembly. There is no cylinder
head to remove and service separately from
the cyl inder.
Cylinder
Disassembly
1. Loosen the spark plug, and remove the
cyl inder from the crankcase.
2. Cover the crankcase with a clean rag so
nothing will accidently drop into the
crankcase.
3. Remove a piston pin
cI
ip from the
... piston, and remove the pin with the
universal piston-pin puller.
Universal piston-pin puller:
YU-01304
MS623 BR250F Service Manual Revised 1/82
2-6
~ Cvlinder Bolt
Piston Pi n CI ip
4. Remove the piston and the small-end
bearing from the connecting rod.