CNC Ported HP661C

What starts life as a Stihl® MS661C-M is transformed in 309 Machine's HP661C. 309 Machine's CNC Ported. The HP661C is the ultimate mix of power and durability. 

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). Add a Stihl lightweight bar and chain when buying the saw and save 20% off.

Performance work includes;

• CNC Cylinder porting
  • Exhaust Port enlargement, timing and polishing
  • Intake Port enlargement, timing and texturing
  • Squish band cut for smaller combustion area
  • Base cut for increased compression
    
• Port matching, baffle thinning and hole enlargement on muffler
• Removal of compression release
  

309 Machine recommends the addition of a performance exhaust and air filter to truly unlock the saw’s potential. We offer products for both of these from Westcoast Saw.

Stihl® is a registered trademark of Stihl® Incorporated and is used only to describe their products.