Author Topic: CS680 piston  (Read 456 times)

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Offline mountainlake

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CS680 piston
« on: July 22, 2014, 01:00:23 pm »

 This one is shot. Also a pic of a treehouse my best customer is building.  Steve

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Offline Cut4fun .

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Re: CS680 piston
« Reply #1 on: July 22, 2014, 01:17:10 pm »
Whats the stories?
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Offline mountainlake

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Re: CS680 piston
« Reply #2 on: July 22, 2014, 04:51:51 pm »
It will be the main floor with 2 bedrooms upstairs plus a deck all the way around, I'll get more pic as it gets built. That's the worst piston I've ever seen come out of a saw .  Nothing wrong with the saw except the limiter caps were on and running lean.  Too bad we have the EPA , how much pollution do all these burnt up saws cause.  Steve

Offline sharkey

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Re: CS680 piston
« Reply #3 on: July 22, 2014, 06:18:04 pm »
Steve,
If you dont want to use an oem 670 or 680 piston, here is an aftermarket one that should work;
http://store.chainsawr.com/products/echo-cs-6700-chainsaw-50mm-piston-kit-10000032430-new

Open up the muffler and put a walbro HDA-63 carb on it.

Offline mountainlake

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Re: CS680 piston
« Reply #4 on: July 23, 2014, 06:03:12 am »

 It's too late for a aftermarket piston as I have a OEM P@C in it already ($124 shipped). It runs good after pulling the limiters and tuning, plenty rich right now. It will get tuned better when I cut with it.   Muff modd for sure, does the bigger HDA 63 carb make a lot of difference, I think a HDA 45 will fit also.  Any place to buy those carb at a good price?   Steve
 

Offline sharkey

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Re: CS680 piston
« Reply #5 on: July 24, 2014, 03:02:09 pm »
If you can find the Walbro HDA-45, it might be the better choice.  I know it is on the 8000.  It would depend on the size of the cs-680 intake runner.       

The 8000 came out with the HDA-45 which continued through the 8000p.  Then came the Echo color change to gray and the HDA-63 replaced the HDA-45.  Both the 45 and 63 have the 16.7 Venturi, but the throttle bore and choke bore on the 45 are larger.  8000's coming out now have an HDA-153, which is down to 15.08mm Venturi.     

Same thing on the 6700.  Original was the HDA-47 (16.7) followed by the HDA-76 and HDA-151 (both 15.08).  With the switch over to the CS-670 the auto choke carb became the HDA-203 (15.08).  CS-680 comes with the HDA-271 (15.08).     

Ebay Carl - Captain Never Sails - has the HDA-63 for $62.95 shipped.  Said he had 3 and when they were gone that he wouldnt be able to get any more.   Walbro works closely with Echo saws. developing fuel curves for their specific engine changes in their air pollution lab.  Specific carbs follow certain serial no. ranges, and when they replace one / obsolete the old one / your limited to what is on the shelves.   

http://www.ebay.com/itm/131243149868?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT     
   

Offline mountainlake

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Re: CS680 piston
« Reply #6 on: July 24, 2014, 06:19:54 pm »

 Sharkey

  Thanks for the info, I think I have a old HDA 45 in my carb box but the adjuster screws were a bit loose when I had it on the 8000 and I really scored on Ebay and got a brand new HDA45 for $5 a few years back which made that 8000 run a lot better.  Maybe I can get those adjuster screws a little tighter on the old 45 carb.  I had that 680 running today and it pulls good for being brand new and no muff modd yet, it should really run with a muff modd, broke in and maybe a bigger carb.. On a good balance scale it weighs 19.5# with a 20" bar@chain full of fuel and oil.   Steve

Offline sharkey

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Re: CS680 piston
« Reply #7 on: July 26, 2014, 07:49:50 pm »
Good job on the 680.  Echo uses the smaller carbs for quick starting.  There should be springs on the HDA-45 needle jets.  If theyre missing I can send you a set out of a rebuild kit.  If they are really wallered out use the blue loctite to tighten them up.  Just dont use a whole lot of it.     

 

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