Cylinder Piston Assembly Oil Seal Crankshaft Spark Plug Kit 537253002 Replacement for Husqvarna 340 345 350 Chain Saw

Bore size is the whole fitment on an engine kit, and this one is quoted at 44 mm across the cylinder bottom aperture, for the Husqvarna 340, 345 and 350. What separates it from most sets at this end of the catalogue is how far below the cylinder it reaches.

Start with the 44 mm measurement

That figure is the supplier's, taken at the cylinder bottom, and it is the one dimension governing whether the kit belongs on your saw. Stroke, gudgeon pin diameter and ring gap are all absent from the listing, which is unhelpful, since those are precisely what gets measured against the parts coming off. Six references are quoted for matching — 537253002, 503932302, 503876301, 537093101, 503898301 and 503854101 — printed as identification codes rather than as any claim about who produced this kit.

It reaches well below the piston

Most sets at this price stop at the top end. This one adds a crankshaft, two ball bearings, two oil seals and a needle bearing, then the recoil assembly on top of that: spring, starting pulley, handle and rope, with an air filter, compression plug and spark plug alongside. In practice it covers a saw whose bottom end has gone as well as its bore — usually the point where a rebuild stops making sense on parts price alone. Iron, aluminium and plastic throughout, at roughly 1342 g.

One ring, which is worth querying

The itemised breakdown gives 1 x Ring against 1 x Piston. Two-stroke pistons in this class commonly carry two, so either this cylinder takes a single-ring piston or the count in the parts list is incomplete. The source does not settle it. Ring count matters to the build, so put the question to us first rather than discovering it on the bench.

Key features

• 44 mm cylinder bottom aperture: the supplier's figure, and the basis of fitment.
• Crankshaft and bearings included: the kit reaches below the piston, not only above it.
• Recoil starter parts supplied: spring, pulley, handle and rope in the same box.
• Six references quoted: numbers to hold against your own parts.
• 1342 g: the shipping weight for the complete kit.

Specifications

• Cylinder bottom aperture: approx. 44 mm (1.73 in)
• Stated fitment: Husqvarna 340, 345 and 350 chainsaws
• Cross-reference numbers: 537253002, 503932302, 503876301, 537093101, 503898301, 503854101 — printed for identification, with no claim as to manufacture
• Materials: iron, aluminium, plastic
• Weight: approx. 1342 g
• Ring count: listed as one — see the note above
• Stroke, gudgeon pin diameter, ring gap and torque figures: not published

What's in the box

• 1 x cylinder
• 1 x piston
• 1 x pin
• 1 x ring
• 2 x snap ring
• 1 x cylinder compression plug
• 1 x crankshaft
• 2 x ball bearing
• 2 x oil seal
• 1 x needle bearing
• 1 x air filter
• 1 x recoil spring
• 1 x starting pulley
• 1 x starter handle
• 1 x starter rope
• 2 x rear handle damping spring
• 1 x front handle buffer spring
• 1 x spark plug

Before any of this goes together

• Engine internals are fitted to the machine manufacturer's own procedure, in their sequence, using their torque figures. None of that comes with the kit, and guessed torque distorts a cylinder or crushes a bearing.
• Pressure-test the crankcase halves and seals before the cylinder goes on. An air leak leans the mixture and will take out this piston the way it took out the last.
• This engine takes a petrol and oil premix. The proportion is printed in your handbook, never in this listing, and nothing here stands in for it.
• Aftermarket parts. The source never describes them as original, and the Husqvarna name identifies the saws.
• Another kit in our range is listed at 45 mm for the Husqvarna 350 and 353 while this one gives 44 mm for the 340, 345 and 350. Measure your own cylinder rather than choosing on model name alone.

Measure the bore on the cylinder you are removing and check it against 44 mm before ordering.

Returns, Refunds and Replacements

Products received faulty, damaged, or not as described are eligible for a return, refund, or replacement in accordance with local consumer laws. We are committed to ensuring all products meet the standards of quality and reliability expected by our customers. Please note that we do not accept returns or provide refunds for change of mind. We encourage you to carefully consider your purchase to ensure it meets your needs and expectations.