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       #Post#: 89782--------------------------------------------------
       Echo 621 620
       By: Chainsawrepair Date: January 31, 2023, 6:34 am
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       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
 (HTM) https://www.echotools.com/en_us/products/chain-saws/chain-saw/cs-621sx_38
       #Post#: 90305--------------------------------------------------
       Re: Echo 621 620
       By: Cut4fun Date: November 19, 2023, 7:38 am
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       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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