spuldup
ArboristSite Operative
Muffler mod is typically always beneficial to engine life, especially on homeowner saws. It gets the heat out, thus lowering the overall temperature of everything. It is probably the best power/effort mod one can do on a saw. Now if you cut in a suburban area you must consider your neighbors. It obviously makes the saw louder.Does the timing and muffler mod adversely affect the longevity of the engine?
Timing/porting can absolutely destroy an engine if not done right. If you want to grind on the cylinder, try opening the EXIT of the exhaust port (and gasket if restrictive). Don't touch the inside of the cylinder, don't touch the intake. You'll have to take the cylinder off and reinstall it, so you'll want some youtube education and a piston ring compressor.
Just doing those 2 things to my 250 woke it up majorly. With an 18" bar it is the tool for all trees and limbs under 14". I'll go to it before the 60-70cc pro saws.