High Quality Chainsaw Bars Husqvarna Toys

Echo Cs 730 hybrid build.

Red97

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Doing a bit of reserch..

Melling offers some sleeves in .0625" wall for some applications. Feel that is a good number to shoot for.

I'm going to make a torque plate fixture. So the jug can be torqued down like it was in the case, Then bored.

With the squish cutting/rod set up I feel it puts extra pressure on the walls especially during an over bore.

Just a thick plate, inside of a thick walled tube that the jug bolts in with the 4 base bolts. Feel that will give a more accurate bore. And allow honing on the lathe :)

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Termitebuffet

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@Woodpecker
@Armbru84

Got to run the latest version of this saw today.

Had a great time meeting up with you fellas. Thanks for the invite.
You done sleeved and honed ? Or you ran bare bore, bare cylinder?

Sawhawgz, ruining the internet since 2012...
 

Red97

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You done sleeved and honed ? Or you ran bare bore, bare cylinder?

Sawhawgz, ruining the internet since 2012...
No, just the original 50mm ported jug.

They both ran it before port work. So figured be good judge before/after.



The sleeves/ bored jug is still in prototype phase lol

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Armbru84

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@Woodpecker
@Armbru84

Got to run the latest version of this saw today.

Had a great time meeting up with you fellas. Thanks for the invite.

Thanks for stopping out Joe. Had a good time as well. Saw definitely had more snap to it with the latest changes. Walked away impressed again...excited for the next changes [emoji16]
 

Red97

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Thanks for stopping out Joe. Had a good time as well. Saw definitely had more snap to it with the latest changes. Walked away impressed again...excited for the next changes [emoji16]
For sure. Wish we would have had more time to try out that stockish 2171.

That 6400 was no slouch eitherr ;)

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Red97

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Picked up some aluminum to make the boring fixture. Should have enough for a few attempts.
637c5084b0a28d7e001c3d7311c0b825.jpg


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hseII

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Think I am going to set up my junk jug. Bore it out 2mm and see how it looks.

Lots of 52mmx12mm pin piston options.

Then I can get rid of the ring of death. Get timing numbers dialed in a bit better.

And turn it into 79.8 cc :firedevil:

I bet they do laugh a bit. I'm sure yamabiko has something prototyped, as the current offerings above the 590-620 haven't changed much in the last 30 years.

If I can get the 52mm deal worked out. That would almost match the cs800 (largest current us echo) displacement but be 4+lbs lighter... sounds like a challenge lol.

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I wonder if a CS-680 would do for a better Base saw.
 

Red97

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I wonder if a CS-680 would do for a better Base saw.
680 has 3.6mm less stroke stock. 50x34 the 590,600,620 are 45x37.6

Big bore short stroke. Same carb, rubber mounts. Roughly same size outboard clutch.

Good bit more weight to it.

The aux oiler would be nice tho.





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Red97

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The Stroke is needed.
Indeed. That is what makes this chassis a good candidate for a "hybrid" super long stroke.

Bore increase is easier than stroke.

Been doing some measuring. Looks like the stock 600 jug can hold a 50mm Id sleeve.
Transfers will get real tight, may not work at all, but is worth a try.

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hseII

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Indeed. That is what makes this chassis a good candidate for a "hybrid" super long stroke.

Bore increase is easier than stroke.

Been doing some measuring. Looks like the stock 600 jug can hold a 50mm Id sleeve.
Transfers will get real tight, may not work at all, but is worth a try.

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Are there any real differences between a 600 & a 620?
 

Red97

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Are there any real differences between a 600 & a 620?
620 has larger carb. .8mm larger venturi unlimited coil.

Metal handle/wrap.

Sportier port timing, double ring piston

Metal clutch cover with bolt on dual spike.

From what I have found all the parts will interchange.

And I should have bought 620's instead of the parts to rebuild/convert 590's/600's lol





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