Assembling The Piston And Cylinder - Husqvarna T425 Workshop Manual

7.23 Assembling the piston and cylinder

1
Cover the gudgeon pin bearing P with a thin layer of
two-stroke oil and insert it into the connecting rod,
press in the covers N. (see fi gure 80).
2
Replace the piston with the arrow facing the ex-
haust port S (see fi gure 82), slide in the gudgeon
pin M and fi t the circlips J (see fi gure 80 and 81).
NOTE! Use new circlips.
3
Oil the piston and piston ring with two-stroke oil.
4
Compress the piston ring and carefully push it into
the cylinder. Put back the seals and screw togeth-
er the crankcase half and cylinder (see fi gure 82).
The screws should be tightened crosswise with a
tightening torque of 15
NOTE!
It is very important that the intake system
is leak tight, or the engine may seize up.
5
Refi t the cylinder, fold in the hose into the out-take
on the fuel unit (see fi gure 83). Fit and tighten three
screws on the bottom of the saw (see fi gure 71).
Tighten two screws on the top of the saw (see fi gure
70). Attach the earth cable under one. Fit the inlet
bellows in the correct direction (see fi gure 70).
Assemble the fl ywheel and ignition coil. Fit the cable
onto the ignition coil, adjust the length and snap it
into place in the cable groove (see fi gure 70).
Refi t the yellow cover paper. Fit the suction hose,
fuel hose and impulse hose (see fi gure 68 and
69). Insert the inlet bellows through the hole in the
handle part. Fit and tighten the screws and fi t the
plastic covers (see fi gure 67).
Assemble the carburettor (see "Assembling the
carburettor").
Fit the air fi lter holder and air fi lter. Connect the ca-
bles to the start/stop button. First thread the cables
through the handle and out through the start button
cut-out and connect them to the start/stop button
(see "Assembling the start/stop switch, fi gure 21,
22 and 23).
Fit the foam rubber piece and washer before as-
sembling the oil pump (see "Assembling the oil
pump and screen").
Fit the:
• cover
• chain guide plate
• clutch
• muffl er
• handle cover
• clutch cover
• starter
• air fi lter cover
Nm.
Fig 80
Fig 81
Fig 82
Fig 83
Repair instructions
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English -