SKU:9773P4
Machined smooth heads
MOS 2 Coating:
Draws heat through piston walls and out the bottom
Reduces heat and friction, for added power and longevity
Helps eliminate cold seizures, and increases durability
Hard anodized crowns
Hypereutectic Cast
The SPI 09-773-04 OEM-style piston kit is designed for engine rebuild and replacement applications requiring a piston assembly with matching rings. This kit combines an OEM-style piston with Teflon-coated rings to support a reliable fit and consistent performance when replacing worn or damaged internal engine components. The .040 designation identifies the piston kit configuration and should be matched to the engine block, cylinder condition, and applicable service specifications before installation.
Installation should be performed by a qualified technician using the engine manufacturer’s procedures. Verify piston, ring, bore, clearance, compression ratio, and related specifications before beginning assembly. Proper preparation of the cylinder walls, correct ring orientation, and accurate measurement are important for achieving the intended fit and performance. Always inspect associated components and replace or service additional parts as needed during the rebuild process.
SPI provides replacement components for professional repair and maintenance needs. This piston kit is supplied as a kit, helping simplify parts selection for applications that require an OEM-style piston and ring combination. The Teflon-coated ring design is included as part of the kit configuration and is intended to support smooth interaction with the cylinder assembly when installed according to manufacturer recommendations. Confirm application compatibility using the SPI part number 09-773-04 and the required engine specifications before ordering or installation.
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