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309 Machine

HP500i

HP500i

Regular price $2,600.00 USD
Regular price Sale price $2,600.00 USD
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Shipping calculated at checkout.
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*3/4 Wrap Saws are backordered. Expected to ship mid June*


309 Machine's CNC Ported HP500i is the ultimate mix of power and lightweight.

HP stands for High Performance, and that's what we are all about. We strive to maximize power while focusing on durability and reliability.

This is for the Power Head Only (PHO).

Performance work includes;

  • CNC Cylinder porting
    • Exhaust Port enlargement, timing and polishing
    • Squish band cut for smaller combustion area
    • Base cut for increased compression
  • Port matching, baffle thinning and hole enlargement on muffler
  • 309 Machine Decompression Plug install
  • Undaunted Manufacturing Billet Muffler Cover
  • Westcoast Saw Foam Air Filter


Independently modified — not a factory STIHL® product.

This saw is built on a genuine STIHL® MS 500i powerhead that has been independently CNC-ported and modified by 309 Machine, LLC. It is sold as a performance-modified product, not as a new, factory-original saw. 309 Machine is not affiliated with, authorized by, endorsed by, or sponsored by STIHL. STIHL® is a registered trademark of ANDREAS STIHL AG & Co. KG and is used here for identification and descriptive purposes only. Modification voids any original manufacturer warranty; any warranty or support for this product is provided solely by 309 Machine. See our Product Liability Disclaimer for full terms.

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