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Forum topic by BrindleDog posted 08-29-2021 11:31 PM 421 views 0 times favorited 4 replies Add to Favorites Watch
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163 posts in 412 days

08-29-2021 11:31 PM

I have an Echo CS 310. I’ve read forum posts about it and many guys recommend modifying the limiter caps and removing the catalytic converter. They claim that these mods significantly increase power, allow the saw to run cooler, and argue that the catalytic converter is ineffective on 2 cycle engines.
Does anyone have any thoughts on this? Are they diminishing the consequences of removing the catalytic converter?

If you only had this saw, would you modify it?

Could you run a 16” bar on this saw stock?

Could a saw this small be used with a chainsaw mill jig?

This saw has surprised me with its reliability. I bought it from a home depot check out table as refurbished for like $120 a few years ago and it has done a lot of work . Don’t fix if it’s not broken? Thanks for any advice.

4 replies so far

View Richard Lee's profile

Richard Lee

455 posts in 2110 days

#1 posted 08-30-2021 12:19 AM

A few threads and vids available for mods.
I have 2 Echo saws a CS490 and a CS 590 both have been excellent saws.

View tvrgeek's profile


2304 posts in 2984 days

#2 posted 08-30-2021 12:23 AM

A 310 is a 16 inch as far as I can tell.
Cat’s work on 2 cycles. Not as clean as a 4, but they work. You can probably load them up if you use too much oil.
Yes, less back pressure is more efficient. Any change there would require changing the mixture. It could be they set it a tad lean for emissions, so going a little richer runs cooler and gives more power. Not sure if you can tweak the advance for the richer mixture. ( You need slightly less) It is an engine and follows the same rules as any other engine.

I would not consider using a small saw on a mill. If you were sawing an 8 inch poplar or fir, maybe, but nothing serious. Mill is quite a duty cycle challenge.

Personally, I would not touch if for the reason you mention. It works. If you need a bigger saw, buy a bigger saw. Unfortunately, all the new saws seem to come with the same junk Walbo carbs regardless of brand. For reliability, I went another route. Kobalt 80V. Starts every time. No fumes. But does not have the power/speed of my cheap Poulan.

View papared's profile


10 posts in 1441 days

#3 posted 08-30-2021 12:05 PM

I’ve had Echo saws for years and never an issue with power or performance. I wouldn’t change anything.


-- Papa Red

View HokieKen's profile


20669 posts in 2473 days

#4 posted 08-30-2021 12:35 PM

I would definitely not attempt to run it on an Alaskan mill. I have a 72cc Stihl I run on mine and would not recommend anything smaller than that. And ideally, I would go bigger. I would say 18” is probably about the limit on that saw. You can always try as big of a bar as you like but you’ll probably find anything much longer will be very slow cutting and very taxing on the saw.

As far as limiter cap and cat convertor, yes you can eek a little more power out. Saws are built to meet emissions requirements and are generally gimped out of the box. But, you need to know what you’re doing and get the carb tuned properly for any changes you make or you’ll likely see decreased performance and possibly shorten the life of the saw.

-- I collect hobbies. There is no sense in limiting yourself (Don W) - - - - - - - - Kenny in SW VA

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