Installing Piston; Installing Cylinder - Bosch PB-650 Service Manual

PB-650
PB-750

8-16 Installing piston

1K313B
(C)
(D)
1K361

8-17 Installing cylinder

(A)
1K314B
ENGINE
(A)
(B)
1. Lubricate needle bearing with the two-stroke oil.
2. Insert needle bearing into the small end bore of
connecting rod.
3. Place piston over the small end of connecting
rod, so that the arrow mark (A) on piston points to-
ward the exhaust side.
4. Insert piston pin guide (B) stamped "10", through
Piston, washers and needle bearing in connecting
rod.
5. Insert piston pin (C) in piston pushing out piston
pin guide (B) using piston pin tool 897702-30131 (D).
6. Install new snap rings to the piston pin bore, and
be sure that they are properly seated in the grooves.
1. Stick a new cylinder gasket on the cylinder base
with a little glue for easier installation of the cylin-
der.
2. Make sure the piston ring on the piston ensuring
that the locating pins are positioned between the
ring ends.
3. Apply oil to the piston ring and cylinder internal
wall.
4. Install the cylinder over piston ensuring that ex-
haust side of cylinder is at arrow side of piston.
NOTE: When installing piston, it is convenient to
use a piston holder 897719-02830 (A) for stabiliz-
ing the piston.
NOTE: Do not rotate the cylinder while installing.
Otherwise, the piston ring and/or cylinder wall might
be damaged.
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