85
Cylinder and piston
7
502 50 57-01
504 90 00-02
Release the cylinder screws and the screw
which holds the spring element to the
cylinder (mod. 2095).
Dismantle the piston from the connecting
rod.
Fitting
Mod. 625/630/670
Mod. 2077/2083
Mod. 2095
Inspect the piston and cylinder as per
chapters ”Cleaning, inspection” and ”Ana-
lysis and procedure”.
Decompression valve
Mod. 2083 and 2095 are fitted with de-
compression valves.
Check that the valve disc seals tightly. If
necessary rub down with grinding paste.
Release the cylinder screws. Use tool
502 50 57-01 (3/16") for mod. 626/630/
670 and mod. 2095.
Use tool 504 90 00-02 for mod. 2077/
2083.
Lift the cylinder and place a cloth in the
crankcase opening to prevent dirt from
dropping down into the crankcase.
Dismantle the piston from the connecting
rod.
Place a cloth in the crankcase opening to
prevent the piston bolt’s circlip from falling
down if it should be dropped.
Use a pair of flat pliers to remove the
circlip.
Fitting
Mod. 625/630/670
Mod. 2077/2083
Mod. 2095
Before fitting the piston and cylinder refer
to chapters ”Cleaning, inspection” and
”Analysis and procedure”.
Decompression valve
Mod. 2083 and 2095 have a decom-
pression valve fitted in the cylinder.
It is important that this is tight for the
engine to provide full power.
Rub the valve disc with fine grinding paste
if it is not tight.
Wash the valve carefully to remove all the
grinding paste after rubbing.
Check that the outlet holes in the valve
are open, including the hole in the cylin-
der wall.
Clean if necessary.
Check that the outlet holes in the valve
are open, including the hole in the cylin-
der wall.
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