` Johnston Performance Chainsaw ... Porting Professional Chainsaws
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Why Port a saw? ...... Because time is money.
More Power More Torque More Timber More Money in your pocket.
Ported Saw ... lighter for same power same torque of heavier saws.
Better full day stamina Better productivity.
Especially when cutting bigger wood and ripping crotches

Following video: Saving 2.6lbs of saw by
swapping a Stock 71cc saw for a Ported 50cc saw

Following video: Husqvarna 372XPG Before and After Porting