Jonsered Chainsaws

[truly]

Newbie here, just joined the forum. I am a chainsaw hobbyist- no pro here. I haven't read this entire thread but (from skimming) am enjoying seeing the love of the 49SP. I just got my first one. A very close friend brought it by. It belonged to his elderly FIL. FIL is/was a prominent man in the community. Bought this saw to keep brush cut back at "the cabin". For the past 20 years the saw has given him fits and my friend basically inherited it. It gave him fits too. They had fits together and have many memories (fond?) of fighting with this saw. It turns out that this highly educated and much accomplished FIL and my friend (a very skilled carpenter and jack of most trades) knew nothing of how to maintain a chainsaw, and did not know that there is a tensioner bolt involved in daily use. They had been prying and twisting and two manning the adjustment of the bar. Turns out they tightened the bar down HARD on the tensioner when it was not in the hole. My friend brought it over and said if I could make it run then I could have it. It started on the 10th pull after sitting idle for 15 years. Then I went to investigating the bar and chain. While Jonsereds are new to me I could tell something was amiss with tensioner. Discovered that the tensioner bolt was bent horribly. Also that drive gear is worn from running overly tight. They would install chain ridiculously tight and it would run for about 3-5 minutes until the chain popped off. I have rebuilt the tensioner and am awaiting the arrival of a new sprocket, bar and chain. I cant wait to put this machine to work.
While waiting for parts to arrive my new admiration for Jonsereds led me to buy a 451E. Ran her for a day and she is nice. Any idea where to purchase the two wire head that goes to the spark plug on a 451E? It must have the transformer built right into the plug boot. Wires look frayed. Runs nice but I want to keep her going for many more years.

 

[bulletpruf]

Newbie here, just joined the forum. I am a chainsaw hobbyist- no pro here. I haven't read this entire thread but (from skimming) am enjoying seeing the love of the 49SP.

Truly - welcome to the Jonsereds thread. Unfortunately, you have to read the ENTIRE thread before you're allowed to post. Skimming is not allowed. See you in a few months! Just kidding, of course. Sounds like your friend and his FIL could use a bit of basic instruction!

 

[joe25DA]

How’s the 451E rate Robin? I looks like a “purebred” jonsereds. But similar to the 5xx series I’d imagine. In good shape great compression. Just got it tonight with 10 other saws

 

[Real1shepherd]

The ignition from the 80 that I got the flywheel off of was configured a bit differently than the 110, 111, or 621. Will have to take a picture and post.

I do have a 90, but I'm still paring down the collection. Started liquidating when I hit triple digits in saws and now I have maybe 35, depending on how you count. Might take me a decade to get to a 3 or 4 saw plan, but I've made some progress.

The plate could be different, but the components themselves should be the same. I know the 80/90 are identical. Yeah, pics would help.

Kevin

 

[Cantdog]

How’s the 451E rate Robin? I looks like a “purebred” jonsereds. But similar to the 5xx series I’d imagine. In good shape great compression. Just got it tonight with 10 other saws View attachment 889382View attachment 889383

Well.....the 451E/EV is a bit more tricky than most older Jonsereds. It was designed as a Pro grade, light, fast limbing saw. As such there are no provisions to bolt on dogs. There were many changes to the basic 451 over the production run. If I remember correctly there were three different igns used. Generally speaking they are a dandy little saw but one has to be careful when acquiring parts or parts saws to get the correct version for your saw. Eric likely has more to add to any 451 discussion ......he always seem pretty well versed in this series. I don't currently have any running 451E/EVs but do have several excellent examples that need some attention. There have been some carb problems noted on this series due to the plastic spacer warping near the bottom of the carb.

 

[joe25DA]

Well.....the 451E/EV is a bit more tricky than most older Jonsereds. It was designed as a Pro grade, light, fast limbing saw. As such there are no provisions to bolt on dogs. There were many changes to the basic 451 over the production run. If I remember correctly there were three different igns used. Generally speaking they are a dandy little saw but one has to be careful when acquiring parts or parts saws to get the correct version for your saw. Eric likely has more to add to any 451 discussion ......he always seem pretty well versed in this series. I don't currently have any running 451E/EVs but do have several excellent examples that need some attention. There have been some carb problems noted on this series due to the plastic spacer warping near the bottom of the carb.

Right after I asked I did research....like a fool. It’s not in the family of the later 5xx saws which I’m happy to know. Certainly is unique in its own right, saw appears to be low hour but missing handlebar. I’ve seen a few on eBay, looking for a unheated version. It has my interest for sure

 

[truly]

I picked up this 451E recently. Have run two tanks thru it. Like it quite a bit. This one has a spark plug wire that is actually two wires running up to an oversized boot. Is that the transformer up there? The wires look frayed and I wish I could replace. Any ideas of who might have one?

 

[Real1shepherd]

I picked up this 451E recently. Have run two tanks thru it. Like it quite a bit. This one has a spark plug wire that is actually two wires running up to an oversized boot. Is that the transformer up there? The wires look frayed and I wish I could replace. Any ideas of who might have one?View attachment 889504View attachment 889505

Like Robin said above, the 451e underwent production changes in the ignition. So searching for parts, you need to know early from later models etc. Chainsawr has an early module and coil assembly(used) for $75.

If it works and if it were me, I'd judiciously apply some marine grade liquid insulation(couple of coats) and let it go at that. If it's just missing some insulation.....but if it's frayed bad, cut, slip some heat shrink on the line, solder the damage and slide the heat shrink over the repair.

Looks like a nice low hr saw.....just time has screwed with the ignition insulation.

Kevin

 

[bulletpruf]

What do y'all think about this dog? It was on one of the 80's that I got in the mail. Is this a one-off or look like something from Madsens?

 

[Woodslasher]

What do y'all think about this dog? It was on one of the 80's that I got in the mail. Is this a one-off or look like something from Madsens?View attachment 889507

Looks like an H and S spike, commonly seen on old Macs and Homelites.

 

[Cantdog]

I picked up this 451E recently. Have run two tanks thru it. Like it quite a bit. This one has a spark plug wire that is actually two wires running up to an oversized boot. Is that the transformer up there? The wires look frayed and I wish I could replace. Any ideas of who might have one?View attachment 889504View attachment 889505

No....that's actually the spark coil on the plug.....that why it has two small wire going to it rather than a normal plug wire.

 

[Zero_sum]

Looks like an H and S spike, commonly seen on old Macs and Homelites.

Yup, H&S spike i have a 80 that came with one from out west. Not sure as to how common, but definitely not a one off.

 

[bulletpruf]

Thanks for the confirmation on the H&S spike. Someone drilled an extra hole in the case to mount it on the beat up old 80 that it came on. I don't think I'll end up doing that on mine.

With the full wrap, H&S spike, and 90 jug and piston, mine should be a neat old saw.

On a related note, is there anything else you need to do to swap a 90 jug on the 80 besides drill a hole in the lid for the decomp? Will the 80 muffler work on the 90 jug?

 

[Cantdog]

Thanks for the confirmation on the H&S spike. Someone drilled an extra hole in the case to mount it on the beat up old 80 that it came on. I don't think I'll end up doing that on mine.

With the full wrap, H&S spike, and 90 jug and piston, mine should be a neat old saw.

On a related note, is there anything else you need to do to swap a 90 jug on the 80 besides drill a hole in the lid for the decomp? Will the 80 muffler work on the 90 jug?

Nope and yep....

 

[joe25DA]

Unfortunately the piston is scored on the 451e. Too bad otherwise it’s very ckean

 

[Cantdog]

Unfortunately the piston is scored on the 451e. Too bad otherwise it’s very ckean

Give Brian Plust or Shayne Blair a call.....

 

[Real1shepherd]

What do y'all think about this dog? It was on one of the 80's that I got in the mail. Is this a one-off or look like something from Madsens?View attachment 889507

Scott...what I did was lay the old J'reds factory dawg on a piece of metal stock, the same thickness. I copied the saw edge and holes of the factory dawg and then traced the design for the rest from a Husky 2100 dawg. I deemed it as not doable to make one for the clutch cover. That was 41yrs ago and it looks like the day I did it. I've run a file on the points a few time because they got hit with something metal moving the saw around a lot.

When your buy these saws well used, at least one of the holes for the dawgs is usually broken on the case. I just moved to some fresh meat and drilled another.

I don't know what's out there for aftermarket dawgs on saws that old. I don't particularly like the design of the one you show, but it works.

Kevin

 

[Real1shepherd]

Unfortunately the piston is scored on the 451e. Too bad otherwise it’s very ckean

The jugs are pretty hard on these saws.....chances are you can clean it up. Used piston are out there......if you think it might have been straight gassed, be sure to test the crank for play. Replace the crank seals as a matter of course. Replace any crank seals that are over 20yrs old, for that matter.

Kevin

 

[JBCattle]

I'm looking for a spark arrestor type muffler from an 80/90 (West Coast muffler). I'm finishing up a restoration on an 80 and it had a 621/66e/70e muffler on it, and it's mashed and perforated. Anyone have one they'd be interested in parting with?

 

[bulletpruf]

I can help if you'll settle for a 621 muffler, but no spare 80/90 mufflers here.