Jonsered Chainsaws

Wesspur
Rugged made
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Real1shepherd said:
According to Acres, the 70 was made from '77-'83. The 70E was released in '79. According to his info, both were electronic...I don't know what the differences were. Robin and Eric can weigh in on the slightly confusing info, or Niko can come in and say again what a crock of sh*t Acres has attempted to put online. If it's just the module, maybe there are some aftermarket units available. Those guys can tell ya hopefully. The plastic flywheel fans were problematic is some models as well.

Kevin
Click to expand...
So the Jonsoreds had plastic flywheels?
 
Kensie1988 said:
So I have a good looking 70e that has no spark, from what I read the SEM modules and or coils go out in them often. What would the best course of action be to correct the problem?
Click to expand...

First thing to do is be certain the connection between the recoil cover and crankcase side is clean and touching......for a quick test I clean the contacts then place one of the recoil bolt washers between the contacts and bolt the cover down tight. Be sure to unplug the kill switch when testing to be sure that isn't the issue. If still no fire it's almost certain you SEM module under the flywheel is spent.....but first remove the flywheel and SEM and make sure the wires coming out the back are not grounded as the insulation often fails right where they exit the module. Of course this is if you have the early version with the plastic fan......the late version has an alum flywheel/fan and the coil is mounted on the cyl not in the recoil cover like the early type. The SEM modules are pretty hard to come by.....ebay or Scott at chainswr.com. might be a while finding one or have to by a parts saw to get one.
 
Real1shepherd said:
Yes, the early ones and they also had a brass contact that needs to stay clean. I'm trying to link you to a primer that Robin wrote on the no-spark scenario of the 70E, but AS won't allow it for some reason.

http://www.arboristsite.com/community/threads/jonsered-70e-no-spark-help.196201/

There it is, finally.
Click to expand...
Only the 52/52E and early 70E had plastic flywheel fans and they were different from each other......the 52E module can be used in the 70E but you have lengthen the connecting wires which is why they carry different part numbers.
 
Cantdog said:
First thing to do is be certain the connection between the recoil cover and crankcase side is clean and touching......for a quick test I clean the contacts then place one of the recoil bolt washers between the contacts and bolt the cover down tight. Be sure to unplug the kill switch when testing to be sure that isn't the issue. If still no fire it's almost certain you SEM module under the flywheel is spent.....but first remove the flywheel and SEM and make sure the wires coming out the back are not grounded as the insulation often fails right where they exit the module. Of course this is if you have the early version with the plastic fan......the late version has an alum flywheel/fan and the coil is mounted on the cyl not in the recoil cover like the early type. The SEM modules are pretty hard to come by.....ebay or Scott at chainswr.com. might be a while finding one or have to by a parts saw to get one.
Click to expand...

Listen to this guy. He knows what he is talking about.
 
SawTroll said:
Surely - I haven't heard of anyone suggesting that he doesn't.

That doesn't necessarily mean that he knows 100% about everything - but mostly he does when he speaks up.
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I don't know anybody alive that knows 100% about everything. And in the many yr I've read your postings and occasionally talked to you, you certainly don't. As far as working on J'reds, Robin has few equals. And it's not just the fact about how many J'reds he's worked on, it's his meticulous approach and diagnosis process. That's something you generally get from being on this planet a long time and paying your dues with respect to small engines.



Kevin
 
LOL!!! I certainly don't, and don't claim to know everything......an impossible goal. Years ago I had a guy on my carpentry crew.....he was a good worker but new at the trade.....I would be trying to explain something in detail so he would understand not only the task but the reason behind the task and method of implementation..............Gil would listen for a while then he'd look down at me and say in a most mocked up Downeast Maine accent....."You know......You don't know it ALL..........I know a little bit!!!!" Damn...that always made me laugh!!

Anything I've found to be tried and true concerning Jonsereds came from an interest in and a lot of "hands on" time and I always try to pass on any help I can to others with a similar interest. Hopefully I can help them avoid some of the mistakes I've made......and there have been more than a couple..LOL!!!
 
Cantdog said:
LOL!!! I certainly don't, and don't claim to know everything......an impossible goal. Years ago I had a guy on my carpentry crew.....he was a good worker but new at the trade.....I would be trying to explain something in detail so he would understand not only the task but the reason behind the task and method of implementation..............Gil would listen for a while then he'd look down at me and say in a most mocked up Downeast Maine accent....."You know......You don't know it ALL..........I know a little bit!!!!" Damn...that always made me laugh!!

Anything I've found to be tried and true concerning Jonsereds came from an interest in and a lot of "hands on" time and I always try to pass on any help I can to others with a similar interest. Hopefully I can help them avoid some of the mistakes I've made......and there have been more than a couple..LOL!!!
Click to expand...

There's a phenomenon that goes on in any of these hobbies. I call it the 'God complex'....wherein people pass on so much information from print and what they read others have said, that too soon they become the purveyors of 'fact'. It often doesn't take in account what happens or can happen in the field. It's nice to read factory lit, sales/dealer brochures and specs but as with most things in life, they don't always bear out in the field. There's always been a chasm between what engineers do in R&D versus what the guys out in the field are trying to tell them about their 'baby'. Sometimes the engineers/technicians listen, sometimes not. Case in point.....Husky really wanted to get on the world map with their 2100 flagship saw. They sent prototypes over to the PNW with one of their top Swedish engineers. He came, he listened to the guys using the saw in the field and they made changes to the 2100 saw before production. That seems like a logical, simple enough process, but it was somewhat rare even back then and almost unheard of now. Today, they jump a model out in the field and if enough people complain they make some changes, or drop the model altogether. That may be a great business model for the bean counters, but it doesn't build a lot of consumer confidence.

So the point I'm trying to make in all this is; I listen to the guy that actually works on saws BUT also uses/tests them for long hrs in the field before making 'greatest saw ever' claims .....versus the guy who builds saws, puts a few tanks(sometimes one tank) through them and goes on to the next saw or project, hailing that he achieved another 'great' build. Or.....you're so much up in your head about specs, factory lit and what's been written on forums that you have no idea what's going on out in the field long term(rule by armchair).



Kevin
 
Amen. In school, while I was taking metallurgy back in the early '70's, our foundry prof and our physical metallurgy prof worked in the field well into their 50's and then quit to teach. They were great. They'd often say, "this is what the text book says, but its not entirely correct in the real world."
We learned a lot from those two men.
They always injected practical stuff from their careers into the lessons which made them very interesting.
 
Yes(!) and that kind of practical teaching is all but extinct. Stuff you learn from guys like that last your whole lifetime. I've been fortunate, I had great teachers out in the field over my lifetime....or maybe I just put myself around them because I knew I could learn more that way.

Kevin
 
Those instructors were fun too. One afternoon, Reg, out physical metallurgy instructor who used a lot of film strips (remember those?) and a roll down screen got a surprise.
We taped a Penthouse center fold to the screen and rolled it back up. Reg pulled it down, took a look and said, "wait here". He trots down the hall and gets John, our foundry instructor and brings him back. We thought we were in for shite for sure. John looks at Reg and says in his heavy Dutch accent, 'Zey didn't make zem like zat when I was young", and then asked if he could have it.
Can you see that happening today?
 
Real1shepherd said:
I don't know anybody alive that knows 100% about everything. And in the many yr I've read your postings and occasionally talked to you, you certainly don't. As far as working on J'reds, Robin has few equals. And it's not just the fact about how many J'reds he's worked on, it's his meticulous approach and diagnosis process. That's something you generally get from being on this planet a long time and paying your dues with respect to small engines.



Kevin
Click to expand...

True.
 
Cantdog said:
LOL....only when selling.......when buying it's just obsolete junk that you can't buy parts for......
Click to expand...

Absolutely....when we die and our kids/grandkids get this junk, it won't be fun for them to sort through and dispose of.

Those J'reds are defintiely on the high-end for me....but it is that time a yr and the big sharks, they be swimming.

Kevin
 
Real1shepherd said:
Absolutely....when we die and our kids/grandkids get this junk, it won't be fun for them to sort through and dispose of.

Those J'reds are defintiely on the high-end for me....but it is that time a yr and the big sharks, they be swimming.

Kevin
Click to expand...

LOL....We'll see if they is bitin'.....gawd...if either of those sell for anywhere near that price you'll see nicer examples hit ebay from the "Rockbound Coast of Maine".......
 

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