STIHL Gasket - 4283 129 0900

The STIHL O.E.M. gasket 4283 129 0900 provides a precise fuel-air-sealed interface between the cylinder block and crankcase, restoring factory compression ratios and eliminating two-stroke powerhead leakage pathways.

Key Features

• O.E.M.-specified neoprene-fiber composite formulated for repeated thermal cycling between 180°F and 400°F
• Precision-cut intake, exhaust, and transfer port apertures aligned to original casting geometry
• Distributed pressure profile prevents localized bolt crush and maintains consistent clamping force
• Chemical-resistant matrix designed to withstand ethanol-blended fuels, gear oils, and cleaning solvents

Product Details

• Manufacturer Part Number: 4283 129 0900
• Component Classification: Cylinder to Crankcase Interface Gasket
• Core Material: Oil-swelling resistant neoprene rubber blended with woven fiberglass reinforcement
• Operating Pressure Range: Rated for standard two-stroke cranking pressures up to 160 PSI
• Surface Finish Requirement: Flat mating faces within 0.002 inch tolerance; deburr sharp threads prior to assembly

Compatibility

• STIHL MS 170 Chainsaws
• STIHL MS 180 Chainsaws
• STIHL MS 200 C-T / C-BE Chainsaws
• STIHL MS 201 MC / TC-M Chainsaws
• STIHL MS 210 Chainsaws
• STIHL FS 56 C-E / FS 91 R / FS 94 R Brush Cutters
• STIHL KS 61 / KS 66 / KS 70 Concrete Saws

This component serves as a direct mechanical replacement during standard powerhead teardown procedures. Install only on cleaned aluminum and magnesium surfaces using torque sequence specifications outlined in the official STIHL service manual to preserve head gasket seating integrity.