Author Topic: CS-590 carb help  (Read 2165 times)

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Online ray benson

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Re: CS-590 carb help
« Reply #10 on: January 26, 2018, 01:11:15 pm »
Hi Ray, I have a 600p service manual and it uses the same Walbro HDA68 carb as the 590.  Initial settings are
L 2 turns open from lightly seated
H 3/4 turn open from lightly seated.
Check your messages for a link to the service manual.

Also sent you the service manual on arboristsite. check your inbox
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Offline Termitebuffet

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Re: CS-590 carb help
« Reply #11 on: January 27, 2018, 07:57:14 pm »
Just a question, does the carb still have the limiters on it ?

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Offline graywarrant

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Re: CS-590 carb help
« Reply #12 on: January 27, 2018, 08:59:29 pm »
Ray -  Thank you very much for providing the manuals, really appreciate you taking the time to do that and they are very helpful.

Term - No, I removed the limiters

660 / All - Question on the pressure/vacuum test: The 600 SM just states it should hold pressure & vacuum, several posts here and elsewhere indicate the pressure/vacuum will drop off, 660's earlier post stated "should not loose more than 1/3 of the test pressure within 30 seconds.".  Which is correct?

After tinkering with the setup for a good part of the day and finally getting things to a point I trust the results, my pressure & vacuum tests both fail.  I checked around the block off plates I made for the exhaust and intake and around the cylinder gasket didn't show any leaks, though I will test further tomorrow.

I now believe I need to remove the flywheel and clutch to check the seals.  Planning on using rope/wire inserted into the cylinder to safely stop the piston and I will rig up something for the clutch removal.  Couple google searches show various options for both stopping the piston and pulling the clutch and I'll do some more googling on removing the flywheel.  Hopefully I can find time to work on the saw tomorrow.

Thanks again for the tips and feedback.


Offline farmboy

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Re: CS-590 carb help
« Reply #13 on: January 27, 2018, 11:21:56 pm »
Remember the clutch is left hand thread. 

Offline pete

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Re: CS-590 carb help
« Reply #14 on: January 27, 2018, 11:52:52 pm »
please DON"T use wire as a piston stop  Soft rope is the way to go

Offline graywarrant

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Re: CS-590 carb help
« Reply #15 on: February 28, 2018, 10:19:42 pm »
I wanted to follow-up and provide everyone an update and belated thank you for all of the assistance.  After much troubleshooting and trips to various repair shops looking for HDA-268A carbs for parts, I ended up buying a new carb from online retailer sawagain - they had both the best price for the item and shipping - totaled $94 delivered and they provided fast shipping.

To recap -
Purchased off of CL for $150, saw would run with ether sprayed in carb, but only till ether burned off
Once home, further inspection revealed a poor attempt at repairing the saw (this after the seller told he hadn't gotten into repairing the saw)
Bad ring, base gasket in pieces, multiple missing parts, screws/bolts, etc
Once parts received and installed, I was able to get the saw running, but poorly
Suggestions from the forum had me check crankcase pressure and vacuum, spark, compression and fuel delivery
All checked good except fuel delivery, could not get consistent delivery out of carb
Cleaned and rebuilt carb
Several tests of the carb from the CS-600P SM provided here (Thanks again Ray) as well as Walbro manuals found online resulted in inconsistent results leading me to decide the carb was shot 

In the end I have $300 in the saw and it runs like a champ.  New Carlton chain from Baileys and it pulls through wood.  Very happy with the result and I learned a heck of a lot more about 2 stroke engines, added a few more tools to the toolbox for future use and to be a bit more wary about CL buying.

Thanks again to all who responded, your input was much needed and appreciated.

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Offline Cut4fun .

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Re: CS-590 carb help
« Reply #16 on: March 01, 2018, 08:09:18 am »
Thats what it is all about.   Folks helping folks learn and repair their ope equipment.

Thanks for sharing your findings and info.


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