Mod. 625/630/670, Mod. 2077/2083, Mod. 2095 - Jonsered 2036 Workshop Manual

7
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Cylinder and piston
Lubricate the piston bolt's needle bearing
with a few drops of engine oil and fit the
piston.
Check that the piston and cylinder have
the correct classing to fit together.
Check before fitting the cylinder that the
inlet pipe and impulse hose are
undamaged and that they seal tightly at
the connections.
Use a new cylinder base gasket and fit
the cylinder.
502 50 70-01
Lubricate the piston bolt's needle bearing
with a few drops of engine oil.
Align the arrow on the piston head to the
exhaust port.
Press in the piston bolt and fit the circlips.
NOTE!
Place a cloth in the crankcase opening to
prevent the circlip dropping down into the
crankcase if it should fly off.
Check that the circlips are correctly fitted
in the grooves by turning them with a pair
of flat pliers.
Classing letters are stamped in the piston
so that it can be fitted together with the
correct cylinder.
A piston which is stamped with the same
letter as the cylinder or a previous letter in
the alphabet will fit in the cylinder.
A piston stamped AB will fit in a cylinder
stamped A or B.
Before fitting the cylinder check that:
● The inlet pipe is not cracked.
● The inlet pipe is fixed on the cylinder
and seals tightly (mod. 625/630/670
and mod. 2095).
● The impulse hose is not cracked and
that it seals tightly to the cylinder
(mod. 625/630/670 and mod. 2095).
Inadequate sealing at the above points
can result in irregular idling and make the
engine difficult to start.
Carefully scrape off the remains of old
gasket from the cylinder base and crank-
case and place a new gasket on the
crankcase.
Fix it with a little grease.
Lubricate the piston and piston ring with a
few drops of engine oil and fit the cylinder
by using set 502 50 70-01.
Tighten the cylinder screws.
Tightening torque: 10-12 Nm.
NOTE!
Do not forget the insulation washer under
the cylinder on mod. 2095.