Jonsered Chainsaws

[WoodDean]

Probably be a good idea at this point to block off the carb & exhaust port....do a vacuum test and a pressure test and look for a leak......if you wanna continue onward with it.

Kevin

Yup, that's exactly where i was headed.

 

[Cantdog]

No, I didn't use a sealer.

Good!

Well Dean it sounds to me like an impulse problem.....That's why I asked about sealer, to much can squeeze out and plug the impulse hole....if it will only run at half choke that tells me that it is getting fuel by creating a vacuum in the bore to suck fuel up from the tank rather than actually pumping the fuel. When you installed the base gasket are you sure you got it on so the cut out lined up with the impulse hole in the case and cyl? The cutouts must face the intake side of the cyl. With the carb off can you blow compressed air in the impulse hole on the manifold and hear or feel it coming out in the crankcase? Or you can squirt WD in the impulse hole in the manifold with the red straw...if it disappears and doesn't squirt back at you it's clear. If you are certain that this passage is clear of obstruction, then the issue is in the carb itself. Be certain you have the carb to manifold gasket on correctly so that the hole lines up with the hole in the carb. Then it's on to the fuel pump.....are you certain you have not flipped the pump layer? The little pointed nib on the corner of both the pump and the gasket point to where the choke shaft attaches to the choke pull. Also I assume you removed/cleaned or replaced the final fuel filter screen in the carb body. I know these may sound like simple questions with obvious answers......but in my experience the simplest things are the easiest to overlook and do incorrectly.....we always want/expect something to be epic when troubleshooting.....the reality is generally the opposite in the end. No harm in doing a pres/vac test but my money is on something simply put together wrong. Not insulting your abilities either.....very easy to overlook the obvious. These days when doing the work you have done on this saw I always install a new set of crank seals anyway....cheap insurance.....can only expect 30-40 yrs out a set..LOL!!

 

[tbone75]

Anyone know if I can use a 920 P&C on my 820 saw ? I would guess I could , but gotta know for sure !

Thanks !!!

 

[Real1shepherd]

Good!

Well Dean it sounds to me like an impulse problem.....That's why I asked about sealer, to much can squeeze out and plug the impulse hole....if it will only run at half choke that tells me that it is getting fuel by creating a vacuum in the bore to suck fuel up from the tank rather than actually pumping the fuel. When you installed the base gasket are you sure you got it on so the cut out lined up with the impulse hole in the case and cyl? The cutouts must face the intake side of the cyl. With the carb off can you blow compressed air in the impulse hole on the manifold and hear or feel it coming out in the crankcase? Or you can squirt WD in the impulse hole in the manifold with the red straw...if it disappears and doesn't squirt back at you it's clear. If you are certain that this passage is clear of obstruction, then the issue is in the carb itself. Be certain you have the carb to manifold gasket on correctly so that the hole lines up with the hole in the carb. Then it's on to the fuel pump.....are you certain you have not flipped the pump layer? The little pointed nib on the corner of both the pump and the gasket point to where the choke shaft attaches to the choke pull. Also I assume you removed/cleaned or replaced the final fuel filter screen in the carb body. I know these may sound like simple questions with obvious answers......but in my experience the simplest things are the easiest to overlook and do incorrectly.....we always want/expect something to be epic when troubleshooting.....the reality is generally the opposite in the end. No harm in doing a pres/vac test but my money is on something simply put together wrong. Not insulting your abilities either.....very easy to overlook the obvious. These days when doing the work you have done on this saw I always install a new set of crank seals anyway....cheap insurance.....can only expect 30-40 yrs out a set..LOL!!

This is sage advice....I just assumed that everything was put back correctly. The diaphragm lever adjustment was a long shot for the symptoms you described...it's not so critical that it won't let the saw run without choke. And those aren't really the conventional symptoms for leaky crank seals. I like Robin's idea that it's an impulse problem.

It's a bum....you need to get rid of it. I'll give it a good home....lol.

Kevin

 

[WoodDean]

Thanks guys, let me check a few of these things off the list. Appreciate the help.

 

[nstueve]

Anyone got a hankerin' for a 820 runner? Kinda one last chance before it hits the bay... 145psi on my gauge. Clean P&C, and squish barley even marked my .050 soldier. Cleaned up real nice, new chain, and reconditioned total super bar.

 

[tbone75]

Anyone got a hankerin' for a 820 runner? Kinda one last chance before it hits the bay... 145psi on my gauge. Clean P&C, and squish barley even marked my .050 soldier. Cleaned up real nice, new chain, and reconditioned total super bar.View attachment 338476
View attachment 338469
View attachment 338470
View attachment 338471

If I hadn't already bought most of the parts for mine ! LOL I am sure I would have been better off and money ahead ! LOL I am looking for a 920 builder or parts saw ?

 

[nstueve]

If I hadn't already bought most of the parts for mine ! LOL I am sure I would have been better off and money ahead ! LOL I am looking for a 920 builder or parts saw ?

You could buy this one and have a 820 and then get a 920 top end for yours. I'm almost positive they are the same bottom end. They have the same 38mm stroke. I messaged "jonsered raket" b/c he would know for sure.

I had thoughts of pulling the top end on this one to delete the base gasket and put on new caber's but just haven't found the time yet...

 

[Stihl 041S]

Just left the JonseredS dealer.
He likes the S.

Handle for Tbones 820
Air Filters for my 111S.
Finally got around to getting them.

 

[tbone75]

Just left the JonseredS dealer.
He likes the S.

Handle for Tbones 820
Air Filters for my 111S.
Finally got around to getting them.

Thanks Ol Buddy !!
I seem to have Jonsereds fever right now ! Working on the 820/920 & 490 ! LOL Need more parts !!!!!! Anyone have anything they would let go of ? Got trade stock !! LOL

 

[Stihl 041S]

Thanks Ol Buddy !!
I seem to have Jonsereds fever right now ! Working on the 820/920 & 490 ! LOL Need more parts !!!!!! Anyone have anything they would let go of ? Got trade stock !! LOL

The guy knows his jonsereds and got great NOS!!! LOL
And he'll mail stuff.

 

[tbone75]

The guy knows his jonsereds and got great NOS!!! LOL
And he'll mail stuff.

Would love to know everything he has ! I need lots of stuff ! LOL

 

[Real1shepherd]

Would love to know everything he has ! I need lots of stuff ! LOL

Hell, all of us keeping the older JonseredS alive need lots of stuff. If you've got an old 80/90,801, I'm poor with ignition stuff.

Kevin

 

[nstueve]

I have a really nice 80 top end if anyone is needy... Got it from an old school dealer down south a while back. Cylinder is clean and it seems like there was one small black score on the piston.

 

[Real1shepherd]

I have a really nice 80 top end if anyone is needy... Got it from an old school dealer down south a while back. Cylinder is clean and it seems like there was one small black score on the piston.

I'd be interested in that. Is that with wrist pin, clips and bearing?

Kevin

 

[nstueve]

I'd be interested in that. Is that with wrist pin, clips and bearing?

Kevin

you got any trade foddar? Got a bunch of saw needs for Stihl right now. 026/036/044/066 and always interested in Makita and Dolmar stuff.

throw me a PM...
Nathan

 

[Real1shepherd]

you got any trade foddar? Got a bunch of saw needs for Stihl right now. 026/036/044/066 and always interested in Makita and Dolmar stuff.

throw me a PM...
Nathan

Sent you a conversation starter.....

Kevin

 

[redunshee]

Is there a differance between the Johhny 670 Champ and Super? Specs seem the same. Is it a manufacturer date?

 

[tbone75]

Is there a differance between the Johhny 670 Champ and Super? Specs seem the same. Is it a manufacturer date?

That is one I would like to know too ! LOL I have a Champ but no Super.

 

[Real1shepherd]

Well, the 90 on ebay went for $108.50 plus $44.71 for shipping. No deal there for sight unseen saw in dubious condition. More frenzy buyer crap....I went to $80 and thought with shipping that I was losing my mind....glad it went to another knucklehead!

Hey Dean....what's going on with your 90??

Kevin