Author Topic: Poulan pro 5020 PR5020 Poulan 5020 4818  (Read 6484 times)

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Online 3000 FPS

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Re: Poulan pro 5020
« Reply #180 on: May 12, 2015, 11:37:07 pm »
Ok I will check it out.   I want to put the tach on the saw I got from Kevin first and see what I get.
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Offline old guy

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Re: Poulan pro 5020
« Reply #181 on: May 13, 2015, 12:59:02 pm »
I went out and fired it up today made a couple or three cuts to warm it up then put the tach to it, the most I could get was 12100 at about 2 1/2 turns out.
  When I bought it I looked in the plug hole with a lite and could see a mark about 5/16" wide above the exhaust port, but the owner put his comp. tester on it and it blew a little over 160, so I decided to take it for $90.
 
I took it home and ran it a small amount, then I got my own comp tester and the saw was down to 148, after running it today it's at 130,I think I gotta pull it down and look at it, looks like a new slug & jug is less than $50
  This will be my first clamshell.

   John



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Re: Poulan pro 5020
« Reply #182 on: May 13, 2015, 01:00:37 pm »
That stock one wont be broke in yet either IMO. Just so you know.  Unless you have put several tanks through it since getting it.
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Re: Poulan pro 5020
« Reply #183 on: May 13, 2015, 01:47:24 pm »
Roger check that coil in the other one. I know it went over 12K. I liked 12.8K if I remember right for my tune stock.
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Re: Poulan pro 5020
« Reply #184 on: May 13, 2015, 01:49:02 pm »
13K would be all I would be comfortable with stock   http://chainsawrepair.createaforum.com/poulan/pp5020-rpm-settings/msg43671/#msg43671

See if the coil has 13.3K 13.5K 13.8k stamped on it somewhere.
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Re: Poulan pro 5020
« Reply #185 on: May 14, 2015, 02:45:57 pm »
Well I did some checks today on the 5020.
First I checked the RPM's on the stock saw and max I could get was 12,200.
I switched coils and the spark plug from the stock to the modified 5020 and still the max RPM is 11,800.

I did a compression test on the stock saw and ground 140 psi.
I did a compression test on the modified saw and only got 125 psi.  Disappointing.  So the ring is not seating.
Even though the saw is not broke in it should be better than that with a squish of .019".
I double checked the squish again and found it still dead on at .019".
I pulled the muffler and could see no problems with the piston or cylinder.

I did block off the intake for the strato portion of the carb and saw ran much richer and after tuning it ran smoother at the higher RPM range.

Well I think I have some things to learn about the strato saws and what works and what does not.
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Offline 660magnum

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Re: Poulan pro 5020
« Reply #186 on: May 14, 2015, 03:22:40 pm »
This rpm report is not that different from what others have said.
We should share what we know... someone may learn...
That knowledge can live after us... and that "Pays It Forward".
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Re: Poulan pro 5020
« Reply #187 on: May 14, 2015, 03:34:24 pm »
I discovered that using the comp tester on a hot saw is not good, as the rubber O ring  on the hose gets hot it distorts and leaks, so I retested the 5020 cold and got 148 rather than 120.
  Next time I go where my other 5020 is I will take the tach along, I'm sure I set that on at 13200.
  John

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Re: Poulan pro 5020
« Reply #188 on: May 14, 2015, 03:46:16 pm »
My experience with Chinese rings is that they are very hard and may take a year or so for one of us with a lot of saws to get broken in completely.

You can see the status of the ring in the exhaust port. My observation is that you would see just a very small portion of the top edge of the ring with vertical marks instead of horizontal marks on a engine after just a few times use?  Whereas a plain cast iron ring would show vertical marks "broken in" from top to bottom at this point.

Also the Chinese tend to pride themselves with "as cast" cylinder walls where the Nikasil is sprayed onto the bore without any prior honing and then the cylinder is stuck over a flap wheel for a few seconds before being declared "finished". You'll see the bounce marks where the flaps went across the ports.

I bought a new Zenoah G62 cylinder some 4 or 5 years ago that said Husqvarna all over it. Most beautiful bore you ever seen with honing before and after chroming.
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Re: Poulan pro 5020
« Reply #189 on: May 14, 2015, 07:30:03 pm »
I know I had set the stock one Roger has at 12.8K sort of fat in my area Ohio.  It could have went higher rpm but not to my liking as I felt any higher was to lean.

Weird 12.2K out your way. Air etc?
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