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

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[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.

 

[FergusonTO35]

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

Just to put a bug in your ear, the 490 is the economy version of the CS-500P that I have. Kris at S&S Worksaws did a fantastic port and muffler mod job on mine so you might want to hit him up. He is a member here.

Thread 'Saw rebuild and/or porting. Apply within'

Jun 10, 2024

Good evening everyone.
Some of you may know me, most probably not. For the ones that don't know me, I have a small saw shop based out of a detached shop on my property. As of right now it's something I do in the evenings and weekends. I do a lot of rebuilds from the bare cases up. I also do cylinder machining, porting, custom muffler mods, timing advanced, oil pump mods, and other odds and ends stuff. Up to this point i have kept busy with local loggers in my area and have flipped a lot of saws I have gone through on eBay.
When it comes to the porting aspect I have dabbled in it for...

• S&S_Work_Saws
• Replies: 116
• Forum: Wanted: Builder/Porter

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