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MS462 with muffler mod, timing advance (vs ported 661)
Ported, Timing advanced, Stihl 661
Big gains on 462 porting
Ported Ms462 and Ported and stroked Ms661 cutting
Stihl MS462 with muffler mod and timing advance
Stihl MS 661 Muffler Mod
Stihl 261 stock vs ported 261 vs ported 661
661 muffler mod and timing advance
STIHL MS 462 Muffler Mod & Timing Advance 💥
Ported Stihl 661 R&D - Tri-port muffler test
661 base gasket delete, muff mod, timing advance
Ported 461 vs 661 - Oak 28" bar
