Big old Jonsereds...

weimedog · December 29, 2010, 03:50:38 PM

So the 61 is complete..runs well. On to the next project. Either going to pick apart a Old Jonsered 920 or a newer Jonsered 2094. Muffler mods and light cylinder mods possible I guess. Any here have any interest in those old monsters? Any pics and historical knowledge to post?

I have a few. Really like them but they are heavy.....and old.

A pic of a couple that might be victims....From left to right...920, 2094, 820. The 2094 is warmed over for GTG's and the other two are essentially stock working saws..I use them!

Some raw materials....

Big Jugs....2094 & 2095 Style

Big Jugs 920 & 930 style (posted before)

New after market pistons for 920 & 2094 (Same piston as a 394 Husqvarna)

Yet another..a 920 I just stuck together last week..stock thru and thru.

So possiblilities....convert the 820 to a 930 top end. Take the stock 920 and convert to a 930 both with cleaned up ports & muffler mods. Actually hope some of you folks post projects as well..especially if you have one of these!

Al_Smith · December 29, 2010, 04:16:08 PM

Quote from: weimedog on December 29, 2010, 03:50:38 PMActually hope some of you folks post projects as well..especially if you have one of these!

I've got a couple in the works once the mood strikes me .However I think I might have ADD because after about 5 minutes of fumbling around trying to figure out of how to post pics on different forums I give it up for a lost cause . I'll take a chill pill,drink a toddy or three and give it the old college try once again though .

Oh come to think about it I do have around 4-5 folders of the soup up jobs I have done .Plus resleeving an old Mac which I think I'm the only one who has ever shown that one on the internet .

weimedog · December 29, 2010, 04:47:31 PM

PM me and I can help you post pics...this evening. I think your stuff would be awesome! So lets just figure out a way to post...worst comes to worst just email me the pics and I'll post the attached files for you,

Al_Smith · December 29, 2010, 07:12:59 PM

:( Well evidently my chill pill didn't work . I gave it the old college try though but tomorrow is another day . ;)

Corley5 · December 29, 2010, 07:25:29 PM

My old 2094 is overhead in the woodshed. It blew a crank seal and I needed a saw so I got a 395XP. Maybe someday I'll get it fixed :-\ It was the 1st my local J-Red dealer sold. He was going to make me a deal on a 930 but I knew what I wanted ;D

Al_Smith · December 29, 2010, 07:33:47 PM

A seal replacement is pretty easy to do .If you have the J-red part number chances are I can cross reference it unless they bastardized them like Stihl .

HolmenTree · December 29, 2010, 09:55:48 PM

My 1st logging saws were Jonsereds: 621, 80,801, 90, 910, 920 and lastly a 630. My older brother had all these plus a 111. I even have all the issues of Chainsaw Age magazine's Jonsered 111 hotsaw project from the early 1980s. That saw now resides in Wayne Sutton's chainsaw museum in Amboy Wash.
My favorite big Jonsered was the 910, very lightweight and I believe had more power then my newer 920. Its been 30 yrs since I ran these saws but I remember well their good power and reliability.

Willard.

weimedog · December 29, 2010, 10:25:56 PM

Any change you can have that saw age article scanned? (I have a scanner if you have a way to get it here)

As far as the 910-920 power difference (and power back in the 930's) I'm sort of developing a theory....ever notice all the Jonsered cases have windows for transfers cast is? The 920's cylinders don't take advantage of that but the 930's certainly do. I have to wonder if a 910's cylinder does. I've posted pics of this around before...but will for this again.

920 Cylinder on the left, 930 on the right, a 920 case on the bottom.

HolmenTree · December 29, 2010, 10:50:07 PM

Has been yrs since I had a Jonsered apart but if the order of photos you show are correct then the 930 cylinder will mate up perfectly with the 920 case. The Stihls didn't have that lip sticking out of the base and were easier to mill then the Jonsered/ Husky.The 910 was different design from the 920 and may have been like the 930 cylinder.
I have never been able to post pics on this site but I'm sure I can somehow scan the Jonsered 111 project saw pages easy enough to you , I'm at the moment in the big city at my inlaws, will be heading home tomorrow. I'll PM you when I get back home.

Willard.

weimedog · December 29, 2010, 10:55:53 PM

Quote from: Corley5 on December 29, 2010, 07:25:29 PM
My old 2094 is overhead in the woodshed. It blew a crank seal and I needed a saw so I got a 395XP. Maybe someday I'll get it fixed :-\ It was the 1st my local J-Red dealer sold. He was going to make me a deal on a 930 but I knew what I wanted ;D

Those old 2094's are pretty nice old saws...I really like them. They had some serious compression stock..power too! I don't see too many that survived the logging world though. Think they were a little too hot.

Spike60 · December 30, 2010, 08:33:30 AM

910's do have the case cutouts and the open bottom cylinders. Open port actually. There are some other differences that prevent parts swapping between the 910 and the 920/930. Haven't run my 910 in a while; maybe I'll bring it up next month. I also have an extra 910 P&C that we can compare to the 920 and 930 examples you have.

Looking at the differences between the fully closed 920 and the open bottom 930, we see the same type of change that was made when going from the 670/272XP to the 2171/372XP. So, it seems they learned something with the 930 that was later incorporated with the 2171/372.

Power wise for the 900's, the 930 was tops IMO. Both of mine will outcut my two 920's and my 910.

weimedog · December 30, 2010, 08:44:30 AM

More true knowledge! Glad you took a look around! There were some questions on that other thread relative to Husqvarna 61 thru 272XP series saws you might address as well.

I also have to wonder if what HolmenTree observed with the 910 t0 929 series was exactly the difference in those windowed vs. non windowed cylinders...and why your 930 isn't afraid of my 2094! On this project think a 930 cylinder is going to find its way on a 820 or 920 so we can compare.

Spike60 · December 31, 2010, 09:20:20 AM

Might as well go with the 930 style since you've got some of each. You've been running enough examples of this family of saws that you should notice any difference.

What pistons are you using? I'm not a big fan of the thin ring stuff.

quietrangr · January 01, 2011, 09:04:48 AM

I had those old Jonsreds, too. A couple of 920s, but before that a 90 that pull started like a V8. You better dropstart that sucker about 90 miles an hour or it would just buck back at you. Then when you shut it off, the rope pulled into the housing with a big thwack. You had to replace the starter rope every couple of weeks. I don't remember if they ever came up with a fix for that.

weimedog · January 01, 2011, 09:22:37 AM

I don't believe they did! (have a fix) The 2094 continued the tradition! Then they put a compression release in...the 2095's I believe all had that compression release. (Sawtroll or Spike60 will know for certain)

All mine are even worse yet as they don't have their base gaskets..just 1194. I am contemplating sending two cylinders out to have a person with better machining equiment than I add compression releases..one to a 2094 and one to a 930 cylinder. The 2094's pull start is flimsier yet than the 920's I would guess that had to be a weak spot for them! Fortunately I have two spares for mine.

What is the possibility than along with really high compression, their stock timing was a little too far advanced on the 920?

Al_Smith · January 01, 2011, 09:49:48 AM

Quote from: quietrangr on January 01, 2011, 09:04:48 AM
You better dropstart that sucker about 90 miles an hour or it would just buck back at you. Then when you shut it off, the rope pulled into the housing with a big thwack. You had to replace the starter rope every couple of weeks. I don't remember if they ever came up with a fix for that.

Not to skew the subject but I had an SP 81 Mac walk the rope on me once .That was the very last time I ever drop started that saw BTW .It's kind of a wake up call when 28" of bar goes wizzing past your ear . Lawdy if it would have started they'd be calling me one ear Al by now .

Now perhaps the problem in some cases could be a worn bushing on the starter rope reel .I experianced such a thing on a 2100 Husqvarna and repaired it by fabricating a brass bushing to replace the worn out nylon one .

HolmenTree · January 01, 2011, 01:04:28 PM

Quote from: quietrangr on January 01, 2011, 09:04:48 AM
I had those old Jonsreds, too. A couple of 920s, but before that a 90 that pull started like a V8. You better dropstart that sucker about 90 miles an hour or it would just buck back at you. Then when you shut it off, the rope pulled into the housing with a big thwack. You had to replace the starter rope every couple of weeks. I don't remember if they ever came up with a fix for that.

My 1970s Jonsered 90 had a decompression button in the top cover. The Jonsered's rubber starter handle helped ease the rewind kickback as well.

Willard.

quietrangr · January 01, 2011, 04:11:18 PM

That might have been a later model. They probably put in the decomp to cut down on the number of dislocated shoulders. And don't try cranking that hog between your legs.

weimedog · January 02, 2011, 01:09:08 PM

Working the 920 "Test Mule" today..the one that going to get surgery after Kevin's 357/359 gets done.....Stock 920 with 28inch Oregon & Stihl 3/8 chain. Was a Beech with the top dying off and making widow makers...decided to pro act vs. have in on my Sugar shack..what better way to test a saw! Have to go to work..tomorrow the 61 gets to limb & block the top half...

(Notched the far side, bore cut 3/4 side to side but bar wasn't long enough even with the notch to get out the back...started back cut saw I was a bit off...took a second cut from back and once 12in or so in put in a wedge & cut to hinge & then wedged it over...it wasn't certain which way it wanted to go..needs some persuasion.)

HolmenTree · January 02, 2011, 06:02:24 PM

Quote from: quietrangr on January 01, 2011, 04:11:18 PM
That might have been a later model. They probably put in the decomp to cut down on the number of dislocated shoulders. And don't try cranking that hog between your legs.

Yep those old Jonsered 90s had kick alright and you couldn't kill them. My 90 was a 1978 and had the decomp. But you want to see compression kick my Jonsered 80 sure had some. One of my favorite Jonsereds, a little bit lighter and almost as much h.p. as the 90, with its silver top it was a beautiful old classic saw.

Willard.

HolmenTree · January 06, 2011, 11:27:58 AM

Quote from: Spike60 on December 30, 2010, 08:33:30 AM
910's do have the case cutouts and the open bottom cylinders. Open port actually. There are some other differences that prevent parts swapping between the 910 and the 920/930. Haven't run my 910 in a while; maybe I'll bring it up next month. I also have an extra 910 P&C that we can compare to the 920 and 930 examples you have.

I did a little research for you Jonsereds fans. The 920 replaced the 910 in 1982 aimed for the west coast market. The man who designed the 920 and 820 was senior project engineer Niels Hartz at Electrolux Motor AB. The new features over its predecessor the 910 are: totally new handle system, new crankcases which provide better fuel tank isolation, a new venting system for the fuel tank, a new clutch, completely redesigned piston and cylinder with new porting, relocated ignition triggering mechanism, new crankshaft and a anti-kick brake.
A good quote I like from Hartz was: "The whole chainsaw is a compromise. You fix one problem and you create another. Sure you could design the 'perfect' chainsaw, but it would weigh 40 pounds!"
From this 1986 press release he also said future chainsaw technology will have on-board computers.

Willard.

isawlogs · January 06, 2011, 11:14:15 PM

I have a 630 that is in need of a top end, where do I start to look for one ???

SawTroll · January 07, 2011, 11:21:35 AM

Quote from: HolmenTree on January 01, 2011, 01:04:28 PM

My 1970s Jonsered 90 had a decompression button in the top cover. The Jonsered's rubber starter handle helped ease the rewind kickback as well.

Willard.

I believe they all did.

Spike60 · January 07, 2011, 12:32:19 PM

Quote from: isawlogs on January 06, 2011, 11:14:15 PM

I have a 630 that is in need of a top end, where do I start to look for one ???

This one is still available, and because the set was also used by Husky, (162), any Husky dealer can get it. Not sure if it's still available from Tilton, or for how long.

Part number is 503 517 502; price is about $250.

A 266XP top end will also work, and there may be some less expensive aftermarket options out there. Any other top end in this family will work, but as discussed in Weimedog's thread, there are some carb/intake changes necessary to fit them.

SawTroll · January 07, 2011, 08:00:35 PM

Quote from: Spike60 on January 07, 2011, 12:32:19 PM
Quote from: isawlogs on January 06, 2011, 11:14:15 PM

I have a 630 that is in need of a top end, where do I start to look for one ???

This one is still available, and because the set was also used by Husky, (162), any Husky dealer can get it. Not sure if it's still available from Tilton, or for how long.

Part number is 503 517 502; price is about $250.

A 266XP top end will also work, and there may be some less expensive aftermarket options out there. Any other top end in this family will work, but as discussed in Weimedog's thread, there are some carb/intake changes necessary to fit them.

Yes, that saw family is really hard to get a grip on all the facts about, as there were several different top ends and carbs, then there also were different intakes, top covers + variants of the case - and who knows what more..... ;D