Author Topic: Echo 621 620  (Read 211 times)

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Offline Cut4fun .

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Echo 621 620
« on: January 31, 2023, 07:34:48 am »
Echo CS621 updated compared to CS620

Thought better save this info I read.

Different parts are:
Cylinder (different porting)
Timing map (adjusted to porting)
Piston (ventilated, different coating)
Piston pin, clips (higher thermal durability)
Pin bearing (higher thermal durability)
Rings (different size, coating)
Exhaust (different internal layout)

Although it lost  bit of peak power it also gained peak torque so in the end nobody can tell the difference.

And the extra weight comes from the same updates the US 590 to 620 got - metal inserts in starter housing, metric screws.

Paper specs 13.8891lbs PHO

https://www.echotools.com/en_us/products/chain-saws/chain-saw/cs-621sx_38

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Offline Cut4fun

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Re: Echo 621 620
« Reply #1 on: November 19, 2023, 08:38:01 am »
Just saving these from different threads. Bore and stroke of 590 620 562 6100 

check me on it
6100 47mm X 35mm
620 590 45mm x 37.6mm
562 46mm x 36mm
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