Author Topic: Poulan pro 5020 PR5020 Poulan 5020 4818  (Read 13177 times)

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Offline 3000 FPS

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Re: Poulan pro 5020
« Reply #160 on: May 10, 2015, 06:07:03 pm »
Ok here is a picture of the engine mounting screw.   It is the self tapping screw that Jim was referring to.   It is a triangular shape on the end.

PP 505, 475, 445.

Offline 3000 FPS

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Re: Poulan pro 5020
« Reply #161 on: May 10, 2015, 06:14:18 pm »
Here is a picture of the cylinder after I lowered the bearing area and then sanded the bottom of the cylinder.
I started with .035" and when I finished with it and put it in the case the squish is now at .019".

I also widened up the intake and exhaust ports and cleaned up the transfers a little.   None of it was big steps just a little grinding to open it up a little.

In the second photo you can see where I put the covers for the transfer ports back in.   They had to be ground down a little to because the bearing seal rides on them also.

PP 505, 475, 445.

Offline jmester

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Re: Poulan pro 5020
« Reply #162 on: May 10, 2015, 08:59:02 pm »
Those screws look similar to those used on stihl 021-039 and ms 210-390 engine pan to cylinder screws. Did you just remove material from the cylinder base to lower the squish? How do the seals and bearings meet the engine pan and cylinder. Would think there maybe a gap as the bearings are the same size and you made the circumference smaller between the pan and cylinder by lowering the cylinder. But I maybe wrong.
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Offline 660magnum

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Re: Poulan pro 5020
« Reply #163 on: May 10, 2015, 09:01:54 pm »
The fit of the seal/bearing pocket and its adjustment were discussed earlier in the thread?
We should share what we know... someone may learn...
That knowledge can live after us... and that "Pays It Forward".
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Offline Cut4fun .

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Re: Poulan pro 5020
« Reply #164 on: May 10, 2015, 09:12:19 pm »
Very neat work Roger.   8)

Be interesting to see how she runs compared to the stocker.
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Offline 3000 FPS

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Re: Poulan pro 5020
« Reply #165 on: May 10, 2015, 09:15:26 pm »
Those screws look similar to those used on stihl 021-039 and ms 210-390 engine pan to cylinder screws. Did you just remove material from the cylinder base to lower the squish? How do the seals and bearings meet the engine pan and cylinder. Would think there maybe a gap as the bearings are the same size and you made the circumference smaller between the pan and cylinder by lowering the cylinder. But I maybe wrong.

I lowered the bearing seal seat first by .016" and then sanded the base of the cylinder by the same amount.   So no gap.
There is a sealant that has to be used between the two halves of the crankcase also.
PP 505, 475, 445.

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Re: Poulan pro 5020
« Reply #166 on: May 10, 2015, 09:19:11 pm »
Very neat work Roger.   8)

Be interesting to see how she runs compared to the stocker.

I am going to port match the intake and the exhaust.   Then do a muffler mod and advance the timing.   It should be interesting.   I still have the other 5020 that I got from you and I have not changed anything on it.   Comparison time.
PP 505, 475, 445.

Offline jmester

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Re: Poulan pro 5020
« Reply #167 on: May 10, 2015, 09:23:47 pm »
Yes sorry just went back threw and read the earlier posts. Very nice tool design and nice work thanks for posting. Need to make sure I go back and read the previous post before I type a reply. Rookie moment
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Offline 660magnum

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Re: Poulan pro 5020
« Reply #168 on: May 10, 2015, 09:35:28 pm »
We've all been there and done that at one time
We should share what we know... someone may learn...
That knowledge can live after us... and that "Pays It Forward".
Be all that you can be . . .

Offline 3000 FPS

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Re: Poulan pro 5020
« Reply #169 on: May 11, 2015, 06:31:22 pm »
I got the 5020 all put back together today.   Saw runs good, idles good, starts good.   Nothing super dooper after all it is still a 50cc saw.   I want to run it some more and break it in alittle before comparing it to a stocker.
I also want to do some compression checks.

PP 505, 475, 445.

 

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