Echo Cs 730 hybrid build.

[Red97]

should be the lightest 80 cc saw ever made.

2 piece head?

Don't think I will have room to keep the covers intact.

Top fin is gone, second is past the bolt holes.

Guess the sleeve could locate the head....

Had planned on doing a blind cylinder. Just grind a hss cutter and plunge in to form the chamber.

May have to swap the hda carb to get good power from 80cc.

Them blanks are close to 11 lbs each lol. The entire power head should be below that once done.

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[Red97]

Should I worry about a "sweep" on the transfer tunnels? Or just a straight up, straight out?

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[tree monkey]

sweep them out as far as you can. better yet, bring then from under the exhaust, wrap them nice and tight around cylinder. now start welding up that case. lol

 

[tree monkey]

6 transfers, with a boost port, case reed

 

[Red97]

sweep them out as far as you can. better yet, bring then from under the exhaust, wrap them nice and tight around cylinder. now start welding up that case. lol

6 transfers, with a boost port, case reed

May be able to feed a couple boost ports from under the ex.

Do like Mike suggested 80% bridged exhaust.

Could take the intake down to the bottom and do a bolt on reed block and a tilly hl

V stack and green weenie.

Seems a bit much for a firewood saw no?

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[Red97]

sweep them out as far as you can. better yet, bring then from under the exhaust, wrap them nice and tight around cylinder. now start welding up that case. lol

661 style?

Anybody have pics of a 661 jug/ case handy?

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[p61 western]

May be able to feed a couple boost ports from under the ex.

Do like Mike suggested 80% bridged exhaust.

Could take the intake down to the bottom and do a bolt on reed block and a tilly hl

V stack and green weenie.

Seems a bit much for a firewood saw no?

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I have a couple spare Pioneer Reed blocks if you decide to go that route Joe.

 

[Red97]

I have a couple spare Pioneer Reed blocks if you decide to go that route Joe.

I'll keep that in mind. I was thinking 50cc 2 stroke race bike stuffs lol

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[p61 western]

I'll keep that in mind. I was thinking 50cc 2 stroke race bike stuffs lol

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Or that lmao

 

[Red97]

I do thing the 6 Transfer ports is doable..

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[p61 western]

I do thing the 6 Transfer ports is doable..

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Kind of like a Poulan pro 405 or 455.

 

[tree monkey]

the boost port goes where the intake was

 

[tree monkey]

6400 has 6 finger ports

 

[tree monkey]

 

[Red97]

Kind of like a Poulan pro 405 or 455.

No, 3 transfer ports in a row, on the sides.

the boost port goes where the intake was

Yes in a case reed setup. If anything I was thinking a cylinder reed setup. Doubt I will go that far with it just yet. But I do have a spare block

6400 has 6 finger ports

Yes like that, but closed ports.
With some sweep to them.


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[tree monkey]

cylinder reed with boost port

 

[Red97]

cylinder reed with boost port

That is what I had in mind if a reed valve was used.

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[tree monkey]

 

[Red97]

Just find a 52mm sleeve from a good running bike and make the jug match lol

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[tree monkey]

case reed with boost port