HELP! Can I install the head from an Echo CS4910 on my CS490?

[Ed Sybert]

I have an Echo CS490 in great shape. I'd like to gain the starting help from the decompression valve that the CS4910 has. Is the newer head a direct substitute for the earlier one? Thanks, Ed

 

[Woodpecker]

Yes I believe you can. You’ll find one of the best threads on these saws here:

Thread 'Echo cs 490 porting'

Mar 18, 2016

Well to keep the clutter out of the 590 thread, I will start this one.

First cuts brand new out of the box, limiters, 18" .325 oregon semi chisel.


Decent compression sotck.



Plenty of skirt on this one, .043 off the base.


Better.

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• Red97
• Replies: 621
• Forum: Chainsaws

• 

 

[furb]

It should all go together. 490, 4910 and 501 interchange

 

[Ketchup]

490 piston is a bit more restrictive with slightly different timing. If you have the 4910 piston use it.