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Recently rebuilt 660 with new seals, rings, piston, cleaned and rebuilt carburetor. Triple ported muffler and timing advanced.

Muffler modification, timing advance, and swapping the carburetor on a Stihl MS170 chainsaw.

Ported 036 Pop up piston Timing advance Muffler mod 24” Bar and Chain

First set of cuts are a stock MS170. The average of the two cuts is 9.89 seconds. The second set of cuts are from an MS170 with the timing advanced, a muffler mod, and an adjustable WT-215 carburetor. The two cuts average 7.92 second for an almost 20% increase in speed over stock.

Stihl MS391 24" Bar Semi-Chisel chain, "Gills" muffler mod

Timmy CS1