Echo cs 490 porting

[Red97]

This one got lost???

On the jug of that saw with the narrow transfer ports I'd chuck up a chain file and make it a bit wider. I heard the file in a drill trick not long ago and had to try it on a exhaust flange and it worked vertical well

Ha have an assortment of 4" long 1/8 diameter burrs I used through the tunnels.



Have lots of time to think about things while watching chips fly... but being away from home, I can't check any of my ideas...

 

[bikemike]

There is more echo builds going on then other saws I love it

 

[bikemike]

 

[bikemike]

 

[Red97]

Looks like it picked up a bit... be curious to see how well that pipe is matched to the port timing in your jug. Shoot even my jug

Thank you for sharing.

 

[bikemike]

Looks like it picked up a bit... be curious to see how well that pipe is matched to the port timing in your jug. Shoot even my jug

Thank you for sharing.

I might send it out to you to try for chits n giggles. I know il need to open my saw up a bit at the exhaust port it's still pretty narrow but I'm gunna wait till after April 9 gtg

 

[drf256]

My saw done. Really fat in the video.

I opened my tunnels, you'll see in the pics.

My final numbers were 106.5 Ex, 121 main upper, 122 second upper, 82 intake.

This saw can pull a 20 no problem.

Even with the extra work, the saw only hits 13,500. Leaning the carb out does nothing. To the point where it has to be tuned in wood.

The recoil is a spring loaded type. Doesn't seem to like the comp. I haven't taken a reading yet.

Build quality much cheaper than a Stihl, but I REALLY like this saw.




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[drf256]

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[drf256]

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[drf256]

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[drf256]

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[drf256]

Here is is super fat at 12,500

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[bikemike]

Here is is super fat at 12,500

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Even tho its fat now it seem very snappy . Still sounds like a tight engine bet she will free up after another gallon

 

[Red97]

My saw done. Really fat in the video.

I opened my tunnels, you'll see in the pics.

My final numbers were 106.5 Ex, 121 main upper, 122 second upper, 82 intake.

This saw can pull a 20 no problem.

Even with the extra work, the saw only hits 13,500. Leaning the carb out does nothing. To the point where it has to be tuned in wood.

The recoil is a spring loaded type. Doesn't seem to like the comp. I haven't taken a reading yet.

Build quality much cheaper than a Stihl, but I REALLY like this saw.




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Looks and sounds great.

Did you leave the bottom ring out?
Nice muffler mod
Definitely plan on opening my second port more, seems yours is easier to hear the 4 stroke.

Yours should really turn up if I can get these carbs figured out.

 

[Canadian farm boy]

Here is is super fat at 12,500

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Looks pretty friggen good Al. That little echo really seems to be throwing the chips. Nice work

 

[drf256]

Thanks.

Single upper ring.

It could not be leaned out. Pulls hard.

 

[bikemike]

Looks pretty friggen good Al. That little echo really seems to be throwing the chips. Nice work

Yeah it sure likes to be worked

 

[Red97]

Thanks.

Single upper ring.

It could not be leaned out. Pulls hard.

I'm thinking that single ring is where the rpm is coming from.

I'm at 106 125 76/88 with the tunnels hogged in a similar fashion.

You have an 026 built you can compare to? Just for giggles.

I'd say we have a winner with this thread, 3 complete saw builds in one thread with minimal derails.

 

[drf256]

The fastest 026 I've ever built is en route to Adirondack Stihl.

This echo is fast. Will be faster if I could lean it a bit, I think.

Or a bigger carb.

The most I saw was 13,600, no air filter.

 

[drf256]

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