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post #11 of 21 (permalink) Old 11-18-2013, 05:53 PM
jow
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My S25s had chrome cyls but a wrist pin keeper failed and ruined one. One was a keeper that just needed the piston/ring set.

What do you feel caused the failure? Such as; the keeper failure was not on me IMO (after 10 yrs I had no no complaints). The 2nd S25 I feel was on me due to working in 100+ degree weather or getting my oil mix off after 10 yrs. I used left over 50:1 from my boat and possibly d/n add the extra oil to make it 16:1 (the tint possibly threw me vs excessive oil).

Good Luck!
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post #12 of 21 (permalink) Old 11-19-2013, 12:35 PM Thread Starter
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Hard to say what caused the failure, but I would beleive it was not enough oil mix.

The bad spots on the piston were at the inlet and outlet only-so I'm guessing heat caused by not enough lubrication.

Parts should be here tomorrow, and I hopefully will have it running by the weekend-(I'm newly retired and this part time job I have is starting to be too much like a real job)
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post #13 of 21 (permalink) Old 11-20-2013, 10:12 AM
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Consider, research or question more experience Techs if a lean Carb mixture could have contributed to this damage. Approximately what is the carb setting “out” from a light seating?
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post #14 of 21 (permalink) Old 11-20-2013, 02:05 PM Thread Starter
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Parts came today, got it together and running-

Runs for a short time and dies-30 sec or so, longer if I feather the throttle

The carb idle speed screw is all the way out-not touching the throttle lever. Have not tried any carb adjustments-really don't know where to start.

Hope someone more experienced with these carbs chimes in.
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post #15 of 21 (permalink) Old 11-20-2013, 03:37 PM Thread Starter
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Got the manal downloaded.

Poulan wants 40:1 mix synthetic 2 cycle oil. No dino oil. (maybe that's what helped melt piston?) Carb is not adjustable except for idle speed-

Will get a fresh mix of 2 cycle fuel-I'll use Poulan oil if I can find it. And maybe make the mixture heavy on the oil. A little more oil never hurt, and the worst that can happen is fouling a plug.
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post #16 of 21 (permalink) Old 11-20-2013, 05:37 PM
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Please attach a good close Picture of the bad piston. Hopefully someone has seen this and know the definite problem before it's damaged again. Approx how many years or hrs did you use the saw before the damage (w/o me looking back)?
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post #17 of 21 (permalink) Old 11-21-2013, 06:55 PM Thread Starter
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Got fresh gas-oil mix with what Poulan recommends.

Runs a lot better, but I still can't get it to idle. The idle speed screw will not screw in to increase the speed.

Don't know how to post pics on forums, not that computer literate.
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post #18 of 21 (permalink) Old 11-21-2013, 08:17 PM
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Reasons for a Poulan Pro 430VS to burn a piston at ports (was my search)? I found some info below but doughty your piston looked like any of these (in the link).

Get a friend to post the picture and you will catch learn the process. I always find the Pics must be a reasonable size (1-2 qualities above email), like 1 meg or less vs the best your camera will take.

The idle issue might be a cable or connection issue.


http://www.smellofdeath.com/lloydy/piston_diag_guide.htm
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post #19 of 21 (permalink) Old 11-22-2013, 01:09 PM
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Take a pic or pics of bad piston and idle adjusting issue showing cable connection and adj screw and plate (as much as possible in good clear Pics. Send them to a trusted friend to post attachments and someone will possibly spot issues.
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post #20 of 21 (permalink) Old 11-24-2013, 01:44 PM Thread Starter
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Found the problem with the idle adjustment.Some were someone cross threaded it.

I worked a little magic and it idles perfectly. Carb should still come apart for a cleaning, but will wait until the endless winter is over for that.

I can find a vac attachment kit for about $50.00 (one of the on-line small engine parts suppliers). If anyone k nows of a used around somewhere, please let me know.
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