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Echo Cs 730 hybrid build.

Discussion in 'Chainsaws' started by Red97, Dec 6, 2017.

  1. Red97

    Red97 Mastermind Approved! GoldMember

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    This is the saw Echo should make.

    Started with the cs 590,600,620 chassis.
    This one is a 600.

    Made a .380" spacer with a flange to fit the case, and a counterbore to fit the jug extension.[​IMG][​IMG][​IMG][​IMG]

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  2. Red97

    Red97 Mastermind Approved! GoldMember

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    Used a 50mm husky 268 window piston.

    Had to cut approx. 040 out of the band to fit. With keeping the numbers close.

    Jug is a 50mm echo 670. Center fed quad port.[​IMG][​IMG][​IMG][​IMG]

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  3. Red97

    Red97 Mastermind Approved! GoldMember

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    Made a spacer/adaptor flange to get the exhaust on the correct angle. And allow the use of a wider flange for the muffler. Which you can see took a bit of doing.[​IMG][​IMG][​IMG][​IMG]

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    Last edited: Dec 7, 2017
  4. Red97

    Red97 Mastermind Approved! GoldMember

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    Made the flange, and the tube to start. Cut, weld, fold, bend till it fit where/how I wanted. Open up the side and cap it off with one of my medium reflectors. Finish off with high temp paint. Ain't super Purdy, but will do the job.[​IMG][​IMG][​IMG][​IMG][​IMG]

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  5. Red97

    Red97 Mastermind Approved! GoldMember

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    Had to trim a few fins at the top of the jug, nothing too major tho. Here you can see the angle of the dangle.[​IMG][​IMG]

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  6. jacob j.

    jacob j. Beezlebubba GoldMember

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    You have some pretty cool stuff going on in your shop...
     
  7. Red97

    Red97 Mastermind Approved! GoldMember

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    Numbers with the 268 piston.

    In 75.5
    Ex 101
    Tr 115

    Widened the exhaust, and lowered the floor about .070 so the piston was above the floor at bdc. Matched the intake port to the 600 boot.
    Opened up the lower tunnels to match the window in the piston.

    [​IMG][​IMG][​IMG][​IMG][​IMG][​IMG]

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  8. Cracker Boy

    Cracker Boy Fl cracker

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    I bet with that spacer and exhaust so far away she will have some torque.looks good.
     
  9. Red97

    Red97 Mastermind Approved! GoldMember

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    Intake boot needed a .080 spacer. That got clamped on on with motoseal for insurance. Little bit of clean up and assembly. Comp reading is fresh after assembly. No run time.[​IMG][​IMG][​IMG][​IMG][​IMG][​IMG]

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  10. Red97

    Red97 Mastermind Approved! GoldMember

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    Ok, all together still need to mod the carb. Omit the bypass nozzle, so I can tune it normally. Still has the 13.5k limited coil.

    So what was the point of this??? And why cs 730?

    Well thus series has a long stroke small bore stock. 45mm bore 37.6 stroke 59.8cc

    Now 50mm bore 37.6 stroke 73.8cc same package :)

    Numbers aren't ideal imo, but I needed a baseline.

    I have about .010-15 before the top of the piston ring gets into the ring of death at the top of the jug. I would really love to get the transfers up round 118-9 but would have to drop the jug .030-40 the piston ring is starting to get close to the snagging point at that depth.

    [​IMG][​IMG]

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  11. Red97

    Red97 Mastermind Approved! GoldMember

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    Proof of life.

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  12. Red97

    Red97 Mastermind Approved! GoldMember

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    Thank you. Plenty to get side tracked with for sure.
    Thank you.

    I hope so. A ton of variables with this critter for sure.

    Hda carb, limited coil, odd timing numbers. Where to go where to go. Lol
     
  13. Backtroller

    Backtroller Here For The Long Haul!

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    Very cool. Love these crazy builds. Can't wait to see it cutting.
     
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  14. Cracker Boy

    Cracker Boy Fl cracker

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    You are the echo whisperer lol.andy wellman aka westhouse saws builds a spacer on allmost all his builds calls it a grunt gasket.looking good.
     
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  15. Red97

    Red97 Mastermind Approved! GoldMember

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    Thank you. Have some smaller test logs leftover from the 50cc saws. It's getting put in wood tomorrow...
    The spacer was mainly to correct the angle, while trying to attach to the stock muffler. That didn't work out, so super muffler mod it is.

    If I were to do it over, I would have formed a horn shape into the can vs the oversize square. But to be honest the square was way easier, and somewhat resembles the stock deflector setup. [​IMG]

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  16. Red97

    Red97 Mastermind Approved! GoldMember

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    Forgot to mention the biggest part for this conversion..

    The wrist pin bearing. The 599,600,620 uses a 11mm pin with the 268 is 12mm. Found a conversion bearing fits the rod, and 12mm pin prefect. Same bearing used to convert the 510 echo to the husky piston as well.

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  17. Red97

    Red97 Mastermind Approved! GoldMember

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    Tuned just at 13k lots of pressure to clean up.

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  18. Cut4fun

    Cut4fun Redneck Chainsaw Repair

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    I was wondering who this was that was showing this build in the chainsaw repair group :cool:. Very nice and thinking out of the box. :b1:
     
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  19. Redfin

    Redfin Meh...

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    Nice work Joe.
     
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  20. Red97

    Red97 Mastermind Approved! GoldMember

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    That be me. Thank you.
    Thank you. It feels really sporty. Need to try some longer bar buried cuts. Get the ring seated in before I tear it back down.

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