Cylinder, Piston - Husqvarna 181 Workshop Manual

7
Cylinder, Piston
Assembly
Check that piston and cylinder have the same classification marking (see fig.
classification table). Fit the insulating piece and the carburetor to the cylinder.
Check that the gaskets are in the correct positions.
Place the cylinder base gasket on the crankcase.
Check that the needle bearing of the wristpin is not damaged. Fit it in the con-
necting rod and lubricate with a few drops of two-stroke oil.
Fit the piston on the connecting rod, Note that the arrow on the piston should
point towards the exhaust port!
Push the wristpin in and fit the circlips. Turn them round with a pair of flat
hose pliers to check that they run smoothly in the grooves.
Lubricate the piston with a few drops of oil
Fit the supporting piece in mounting set No. 5025070-01 below the piston.
Pressthe piston rings by means of the piston ring compressor in mounting set
No. 5025070-01. Push the cylinder carefully down over the piston,
To avoid breaking the piston rings, do not turn the cylinder. Turn the crank-
shaft and check that the piston moves easily in the cylinder. Fit the plastic
sleeve over the adjusting needles. Tighten the four cylinder base screws dia-
gonally and evenly. Fit the silencer.