Author Topic: Jonsered 2083  (Read 10866 times)

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Offline Cut4fun

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Re: Jonsered 2083
« Reply #180 on: June 25, 2018, 12:02:33 pm »
Ext & int isnt pretty but think I was able to save what had been done by someone in past which was hanging the ring on ext side breaking them.   Running and taking throttle good so far.

Hope to tune and put in some wood when I get back later today.



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Offline Cut4fun .

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Re: Jonsered 2083
« Reply #181 on: June 25, 2018, 07:12:45 pm »
Well dog turd.  Same thing, broke another ring running for less then a min. Never even made a cut.  Looking how ring is in port. They just went too wide.   So 77cc or 71cc she will be.
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Re: Jonsered 2083
« Reply #182 on: June 25, 2018, 11:50:32 pm »
You can try and bevel the port even more.    That is one reason I like using a ball hone.   It takes any sharp edges off of the ports.

PP 505, 475, 445.

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Re: Jonsered 2083
« Reply #183 on: June 26, 2018, 09:06:20 am »
Dont think it is the bevel now after doing that yesterday.  Thinking someone went to wide and that has something to do with it. Then again I could be wrong.
Was going to try and get time to measure and or compare to a stock port on piston today. 

The way the ring sticks out the ext port after breaking seems weird and I am WAGing for ideas to why. I thought it was beveling was not enough by whoever did it. Fixed that part I thought, so WAGing to other things as to why. Ring breaks right in the middle and right in the center of the ext port area.

Ball hone was used on 1st clean up and then again after adding beveling 2nd time.

Funny listening to it while it is running for the tell tell sound of when the ring cracks.  Pretty wild sound from a saw.
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Offline Cut4fun .

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Re: Jonsered 2083
« Reply #184 on: June 26, 2018, 02:11:42 pm »
Compared the port shape and width to a stock 475 cylinder.  IMO rules at my to wide WAG. Has to be bevel catching it. Worked over the little more as I guess lower could be suspect and hit the top some more.  But IMO there is more now then the stock cylinder has.

Think I may have just used my last 2 54 1.5 rings so need to order some more. 
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Re: Jonsered 2083
« Reply #185 on: June 26, 2018, 04:11:00 pm »
Hindsight now. But should have read the 1st ring the saw came in broke with. Then the 1st one I broke.   I just looked at the 1st and 2nd caber I broke and could see where it was hitting right beside where it crracked both times. First one of mine was hitting top and bottom on ring. 2nd one was just the bottom.  So tried to fix the crap someone did to it.
I found a used good 54 to put in it from a past build of mine.  Right now running and cutting.

Anyone have a new 54 1.5 to measure the radial wall thickness of? I checked the new broke caber 2.24mm and used one I put in 2.16mm.  Just was checking to see how much wear was on the used one.

In a bit to see if that green coil is going to be rev limited like the 475 505 was or unlimited like the ones in 445.  Right now around 11K
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Re: Jonsered 2083
« Reply #186 on: June 26, 2018, 07:48:10 pm »
2nd testing with 28" buried. Took it up to 12K. So must not be a rev limited green coil.  Which is cool. But saw failed while cutting 2nd block.
Sounded crunchy this time around, unlike the broken ring deal.  Will try to tear down tomorrow for a peek. 
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Re: Jonsered 2083
« Reply #187 on: June 27, 2018, 12:17:20 pm »
This red one seems to be fighting you........maybe you should put some yeller parts on it? 
We just drag them down..... Until they're just like us !!!  BNL
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Re: Jonsered 2083
« Reply #188 on: June 27, 2018, 01:34:53 pm »
This red one seems to be fighting you........maybe you should put some yeller parts on it? 



If the rod etc survived the grenade inside. She will be getting a yellow 475 or 445 topend next.   
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Re: Jonsered 2083
« Reply #189 on: June 27, 2018, 03:06:35 pm »
Strike 3 for this 54mm p+c. Stick a fork in it.
Even got the pieces out of the muffler with baffle still in it.
Just glad it didnt bend the rod.
Was tracing what the shape of the ext was on it on a 066 piston to compare to a stock 475. Yes both off centered I just stuck them in to trace onto them.

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