partszen Cylinder & Piston Kit for Stihl MS390 MS290 MS310 — 49MM Bore, Ready-to-Install Top-End Replacement

If your Stihl chainsaw is struggling with poor compression, heavy smoke, or inconsistent power, replacing the cylinder and piston can bring it back to reliable operation. This partszen kit matches OEM fit dimensions (49MM) and replaces part number 1127 020 1216. It ships as a ready-to-install bundle that includes the cylinder assembly and the common small parts needed to complete the swap.

Will this cylinder and piston fit my Stihl MS390, MS290, or MS310?

Yes — the kit is designed specifically to fit those three Stihl models and corresponds to the listed replacement part number. Before ordering, verify your saw’s specifications to confirm the 49MM bore size and the part number match your existing component.

• Compatible models: Stihl MS390, MS290, MS310
• Bore size: 49MM to match factory dimensions
• Replacement part number: 1127 020 1216 equivalence
• Check your saw’s model plate or service manual for confirmation

What exactly comes in the partszen replacement kit?

The package is supplied as a comprehensive replacement set so you won’t need to source small parts separately. Alongside the cylinder and piston, the kit contains the essential hardware and consumables commonly replaced during a top-end rebuild.

• 1 x cylinder assembly sized to 49MM
• 1 x piston and related piston pin bearing
• 1 x stud, 1 x plastic pipe, and 1 x oil line
• 1 x spark plug, 1 x oil filter and other necessary small items as pictured

How difficult is installation and what should I watch for?

Installation requires intermediate mechanical skill, basic hand tools, and attention to gasket surfaces and torque specs. If you’re comfortable removing the top-end of a two-stroke chainsaw and following a repair manual, you can complete the swap; otherwise, consult a qualified technician.

• Use a service manual for correct disassembly and torque values
• Replace gaskets and seals to avoid air or oil leaks
• Inspect crank and bearing condition before reassembly
• Confirm ignition timing and carburetor adjustment after install

What maintenance benefits can I expect after installing this kit?

Fitting a new cylinder and piston restores the sealing surfaces that create compression, which typically improves starting behavior, power delivery, and fuel efficiency. It also helps reduce excessive smoke and oil consumption caused by worn cylinder walls or piston rings.

• Restores compression for stronger throttle response
• Reduces blow-by and oil burning from worn components
• Helps the saw idle and start more consistently
• Extends usable life of the engine when installed correctly

Who is this for: This partszen 49MM cylinder and piston kit is aimed at owners, professional arborists, and service technicians working on Stihl MS390, MS290, or MS310 chainsaws who need a complete top-end replacement. It’s suitable for anyone performing routine engine rebuilds or repairing worn engines that match the 1127 020 1216 specification, provided they have the tools and mechanical know-how to carry out the installation safely.