AUMEL Stihl TS410 TS420 Cylinder Piston Gasket Kit 50mm — Top-End Repair Kit with Spark Plug & Decompression Valve

The AUMEL 50mm Cylinder Piston Gasket Kit is a complete replacement package engineered to restore compression and reliable operation for Stihl TS410 and TS420 cut-off saw engines.

When a two-stroke cut-off saw begins to lose power, smoke, or fails to start reliably, worn cylinder or piston seals are often the culprit. This AUMEL kit contains the parts commonly required to refresh the top end of your Stihl TS410/TS420 — including a piston/cylinder assembly, spark plug, decompression valve and essential seals — so you can get the saw back to consistent service without sourcing multiple individual parts.

What parts are included and why they matter?

The kit supplies a full complement of components needed for a routine top-end rebuild and common failures. Each item addresses a specific seal, filtration, or ignition need so the engine can regain proper compression and combustion.

• 1 cylinder and piston kit – restores bore and piston wear tolerances.
• 1 spark plug – ensures consistent ignition timing and easier starts.
• 1 decompression valve and 1 plug – improves starting and reduces strain on the starter.
• 1 fuel filter and 1 primer bulb – protects carburetor from debris and improves fuel delivery.
• 2 oil seals and 2 cylinder gaskets – prevent leaks and maintain compression.

How do I know this fits my saw?

This AUMEL kit is made for Stihl TS410 and TS420 cut-off saw models and is a direct replacement for part numbers 4238 020 1202, 4238 020 1205, and 4238 020 1207. Verify your model number before ordering to ensure compatibility.

• Fits Stihl TS410 and TS420 models specifically.
• Replaces OEM numbers 4238 020 1202/1205/1207 for direct swap-in.
• Includes 50mm piston diameter sized to match factory specs.

How difficult is installation and what tools are needed?

The kit is built for straightforward top-end replacement; basic mechanical skills and common hand tools are sufficient. Removing the cylinder and piston, swapping gaskets and seals, and reinstalling the supplied components typically takes an intermediate DIYer one to two hours depending on experience.

• Required tools: socket set, torque wrench, screwdrivers, circlip pliers, feeler gauge.
• Follow service manual torque specs for cylinder and head bolts.
• Clean mating surfaces and replace gaskets to prevent leaks.

What performance and durability can I expect?

Components are manufactured to withstand heavy use and frequent operation typical of professional cut-off saw environments. The materials chosen emphasize wear resistance and sealing longevity to help maintain engine compression and reduce downtime.

• Durable piston and cylinder finish to limit rapid wear.
• Quality gaskets and oil seals to reduce air and oil leakage.
• Included consumables (spark plug, filter, primer bulb) to return reliable starting and fuel delivery.

Who is this for: This AUMEL 50mm Cylinder Piston Gasket Kit is aimed at professional contractors, rental shops, and experienced DIYers who maintain Stihl TS410 or TS420 cut-off saws and prefer a single, complete solution for top-end repairs. It’s useful when the saw shows poor compression, decreased power, hard starting, or oil/fuel leakage, and when you want to avoid sourcing multiple parts separately. For first-time repairers, having a service manual or professional guidance is recommended to ensure correct installation and torque settings.