CNC cylinder porting for optimized airflow and increased power
Exhaust port enlargement enhances exhaust velocity for improved cutting performance
Timing and polishing for precise engine tuning and reliability
Squish band cut for smaller combustion area increases compression
Billet exhaust for reduced weight and improved airflow
Summarized by Shop
309 Machine’s CNC ported HP400 packs a lot of punch in a little package. This is the ultimate mix of big saw power in a little saw package.
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 a Powerhead Only, No Bar and Chain are included.
Compatibility
309 chainsaw (performance only, no bar or chain included)
Porting
CNC cylinder porting, exhaust port enlargement, intake port timing, squish band cut
Manufacturing
Undaunted manufacturing billet exhaust
Plug
Decompression plug included
Summarized by Shop
5.0
1 rating
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MS400c ported
Fast, prompt excellent service. I called after receiving my ported 400c for a simple question. Mike answered my question right away.
After the ported saw got broke in. Quite a few tanks of fuel. 2 worn out 24 in chains (4-5 sharpening's each, Teeth were more than 1/2 gone). That saw started to come alive.
After running my stock 400c to the ported 400c thru the same 26 inch cotton wood. What a difference! Soon I hope to compare running against my 462 and 500i . I do have the undaunted mufflers for all my Sthil's. Very much temped to get a ported 462 and 500i from 309! And maybe 261.
