Echo Cs 730 hybrid build.

[Red97]

Joe this is excellent work as always and a dang good thread to boot Thank you for taking the time to do it it looks stout for sure and I can't wait to hear more about it when you get to put her in some big wood .

Thank you, hopefully we can find some sizeable ash today.

 

[Red97]

Let a friend run it today. He was getting on it pretty good. Chugged along a lot better than I was expecting. Had it tuned round 13.3k pulled down to 8800ish sweet spot seemed to be close to 11k.

Here is his 590 i ported, same log 24" bar and a better chain. Does well, but doesn't power through like the 730.

I believe dropping the jug a bit more will help wake this saw up. Get the transfers up to 118, and 18* blow down will work well. I think.

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[Armbru84]

Let a friend run it today. He was getting on it pretty good. Chugged along a lot better than I was expecting. Had it tuned round 13.3k pulled down to 8800ish sweet spot seemed to be close to 11k.

Here is his 590 i ported, same log 24" bar and a better chain. Does well, but doesn't power through like the 730.

I believe dropping the jug a bit more will help wake this saw up. Get the transfers up to 118, and 18* blow down will work well. I think.

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Joe, will you be able to bring this saw to Custers?


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[Red97]

Joe, will you be able to bring this saw to Custers?


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Yeh if it ain't blown up.

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[Red97]

Joe, will you be able to bring this saw to Custers?


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Yeh it it ain't blown up.

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@Woodpecker supposed to test it out this week.......

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[Woodpecker]

@Woodpecker supposed to test it out this week.......

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I promise to be gentle!

 

[Armbru84]

@Woodpecker supposed to test it out this week.......

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Looks like it won’t make it to Custer’s then...

 

[Red97]

Looks like it won’t make it to Custer’s then...

Lol

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[tree monkey]

what are your numbers and comp? ign timing?

 

[Red97]

what are your numbers and comp? ign timing?

Intake 75.5
Exhaust 101
Transfers 115
Comp was just under 210 at assembly

Timing 11*@3000 32*@8000 31*@11000

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[tree monkey]

timed cuts is your friend. make 1 change at a time. I'd be working my way towards intake 80, transfers 120-122, ex 100-103, advance ign timing 2deg. at a time. test test test.

 

[Red97]

timed cuts is your friend. make 1 change at a time. I'd be working my way towards intake 80, transfers 120-122, ex 100-103, advance ign timing 2deg. at a time. test test test.

Thank you very much for the input.

Looks like a 044 piston, jug dropped and only the bottom ring I could hit those numbers.

Unless someone knows of a taller window piston than the 268xp. 50mm bore. 12mm pin. Or at least a thicker crown/ lower ring placement.

 

[Red97]

Doing some reserch..

The 620 unlimited coil does indeed have a steeper curve, and more ignition advance. Good bit more imo.
CS620 / shindiawa CS600SX
9* @ 3kBTDC
26* @8k BTDC
38* @10k BTDC
39* @12k BTDC

Seems like a good bit more advance than the 590-600p coil

The original saw the jug came from(cs670-80) had max ignition timing of 25*@10k

 

[ferris]

timed cuts is your friend. make 1 change at a time. I'd be working my way towards intake 80, transfers 120-122, ex 100-103, advance ign timing 2deg. at a time. test test test.

You have julian..
That is not fair

 

[tree monkey]

You have julian..
That is not fair

I don't rent out farm animals, but I will put Julian up for rent. hourly, daily, weekly, or monthly rates apply.

 

[Dub11]

I don't rent out farm animals, but I will put Julian up for rent. hourly, daily, weekly, or monthly rates apply.

When was his last trip to the vet?

 

[tree monkey]

well he did visit ted not long ago, does that count?

 

[Redbull661]

When was his last trip to the vet?

I am sitting here at Scott's shop. We are laughing our asses off!

 

[Dub11]

Did you put him in corentin afterwards?

 

[Chainsaw Jim]

I heard @TreeLife is still trying to get his bucket of lard back from those two.