Ignition Coil Module with Spark Plug Suitable for JONSERED Chain Saw 450 455 525 535 490 590

Six Jonsered saws share one ignition coil reference. Number 544018401 is listed for the 450, 455, 525, 535, 490 and 590, and this replacement arrives with a lead and a spark plug beside it — more useful than it sounds when the fault has not yet been pinned down.

544018401 across six machines

One number spanning six saws points to a shared ignition platform rather than a loose fitment claim, but the number is still what you verify against, never the model plate. It is quoted so you can identify the part, not to say who built it. Where a saw has been through a previous repair, the fitted coil may already carry a superseded number, which is precisely why a physical check beats a badge.

A plug in the box narrows the fault down

Weak or missing spark has three cheap causes before it has an expensive one: a fouled plug, a chafed stop-switch wire, and a lead that has hardened and begun tracking to earth. This kit supplies a fresh plug and a wire, so two of the three can be eliminated with parts you have already paid for. Fit the plug, earth it against a cylinder fin, pull the cord. A fat blue snap means the coil was never the culprit.

Silicone where most use rubber

Materials are listed as steel and silicone rather than the steel and rubber quoted on most coils in this range. The supplier attaches no performance figure to that, and neither will we. Complete kit weight is around 175 g, heavier than a bare coil because of the lead and plug travelling with it.

Key features

• Reference 544018401: one number covering all six listed saws.
• Lead and plug supplied: two common fault causes ruled out in the same purchase.
• Steel and silicone: the materials the supplier states for this unit.
• 175 g gross: the published weight for the complete kit.

Specifications

• Item: ignition coil module supplied with lead and plug
• Cross-reference number: 544018401 — given so the part can be identified; who produced it is never declared
• Stated fitment: Jonsered 450, 455, 525, 535, 490 and 590 chainsaws
• Materials: steel, silicone
• Gross weight: approx. 175 g
• Not stated anywhere by the supplier: the air gap figure, coil resistance, wire length and plug heat range

What's in the box

• 1 x ignition coil
• 1 x wire
• 1 x spark plug

Fitting and first start

• Clearance between coil and flywheel is quoted nowhere in this listing. Look it up in your machine's handbook and set it to that.
• Torque for the mounting screws comes from the saw maker. No figure accompanies this part.
• An aftermarket replacement. The source stops short of calling it original, and the Jonsered name is present to identify the saws.
• The supplier's own note asks you to confirm model and specification before ordering. Worth doing.
• These engines run on premixed petrol and oil. No ratio is published here, so take yours from the manual.

Confirm 544018401 against the coil already on the saw 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.