Honda CRF250R 2018 Owner's Manual page 89

Piston/Piston Rings/Piston Pin
3. Install the piston (3) with the " " mark (4) and/
or the large valve recesses (5) facing the intake
side of the engine.
(3)
(3) piston (5) large valve recesses
(4) " " mark
Apply molybdenum disulfide oil (a mixture of
1/2 engine oil and 1/2 molybdenum disulfide
grease containing more than 3% molybdenum
disulfide additive Moly Paste 77) to the piston
pin (6) outer surface. Apply engine oil to the
piston pin hole inner surface. Install the piston
pin and new piston pin clips (7).
NOTICE
Be careful not to damage or give a shock to the
piston pin.
Use new pin clips. Never reuse old clips.
Do not let the clips fall into the crankcase.
Do not align the piston pin clip end gap with the
piston cutout (8).
84
Servicing Your Honda
(4)
(7)
(8)
(6) piston pin
(7) piston pin clips (new)
(5)
(7)
Cylinder Installation
1. Clean the cylinder mating surfaces (1) of the
(7) (6)
(8) piston cutout
(1) crankcase mating surface
2. Remove the shop towels.
3. Install the dowel pins (2) and a new cylinder
NOTICE
Do not let the dowel pins fall into the crankcase.
(3)
(2) dowel pins
crankcase, being careful not to let any material
fall into the crankcase.
gasket (3).
(2)
(3) cylinder gasket (new)
(1)