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NWP Big Bore Piston & Cylinder Assembly (52mm) for Stihl 044, MS 440 Chainsaws

NWP Big Bore Piston & Cylinder Assembly (52mm) for Stihl 044, MS 440 Chainsaws

Average rating:
Only: $129.99
Item #: BBN 044
In Stock

Shipping weight 1.75 lbs.

Big Bore cylinder assembly from NWP. Big Bore cylinder kits come with an oversized cylinder and piston (2mm), which will give your chainsaw increased displacement as compared to the stock cylinder. Cylinder assembly includes an oversized piston, rings, piston pin, circlips and cylinder. Cylinder bore is NiSi coated for long life. These pistons have a thin coat of molybdenum, which helps reduce friction and wear during the initial break in period. Piston rings are made from ductile cast iron, so your chances of breaking them during installation are greatly reduced. We recommend using a piston ring clamp set when changing your cylinder.

Important Note: Big Bore cylinder kits should be installed by professionals only, as some models may require slight crankcase modifications for fitment.

Please see the tabs below for specifications and fitment options before ordering.

Big Bore cylinder assembly from NWP. Big Bore cylinder kits come with an oversized cylinder and piston (2mm), which will give your chainsaw increased displacement as compared to the stock cylinder. Cylinder assembly includes an oversized piston, rings, piston pin, circlips and cylinder. Cylinder bore is NiSi coated for long life. These pistons have a thin coat of molybdenum, which helps reduce friction and wear during the initial break in period. Piston rings are made from ductile cast iron, so your chances of breaking them during installation are greatly reduced. We recommend using a piston ring clamp set when changing your cylinder.

Important Note: Big Bore cylinder kits should be installed by professionals only, as some models may require slight crankcase modifications for fitment.

Please see the tabs below for specifications and fitment options before ordering.

Item #: BBN 044
*Please select one valid option from each style

Shipping weight 1.75 lbs.

In Stock
Fits the following models:
  • Stihl 044* (After S/N X 29 382 283), MS 440 <
  • Bore 52mm
  • Stroke 36mm
  • Displacement 76.5cc
  • Rings 52mm x 1.2mm
  • Important Note* Older 044 chainsaws made before serial number 29 382 283 have a 10mm piston pin. This assembly will not fit.

View the installation instructions (743K pdf file)

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