Husqvarna 343R, 345RX, 343F, 345FX, 345FXT manual Cylinder and piston, Dismantling

6 Cylinder and piston

The cylinder and the piston are two of the compo- nents exposed to most strain in the engine. They must withstand, for example, high speeds, large tempera- ture swings and high pressure. Moreover, they must be resistant to wear. Despite these tough working conditions, major piston and cylinder failure is rela- tively uncommon. The reasons for this include new coatings in the cylinder bore, new types of oil and grease and refined manufacturing techniques.

When servicing these components, cleanliness is of the utmost importance. It is therefore recommended that the cylinder and the area around it be thoroughly cleaned before being dismantled from the crankcase.

A

42

Dismantling

Dismantle the following components to make the cylinder accessible: Starter, cylinder cover, muffler guard, muffler and spark plug.

NOTE!

The throttle need not be removed to dismantle the cylinder and piston.

Loosen the clamp (A) and unscrew the bolt a good distance (to facilitate the coming assembly) so that the clamp can be turned around the inlet manifold without affecting the cylinder.

Then loosen the 4 bolts holding the cylinder.

Carefully lift out the cylinder by twisting is backwards and forwards until it loosens from the inlet manifold. Make sure that no dirt enters the crankcase.

Use a rag to cover the crankcase opening under the piston.

502 50 18-01

Remove the circlips from the gudgeon	Using long-nose pliers remove the
pin.	gudgeon pin circlips.

Keep your thumb over the circlip to prevent it from flying out.