New bar studs and muffler mod for the Jonsered 920.

Modifiedmark · Mar 5, 2012

I had already swapped some Husky 77 bar studs to the 920 so the Husky bars would be a direct bolt on but they were a little shorter on both ends then I liked so I turned a set up from scratch.

The muffler was quite restricted so I ground out the inner plate and replaced the small 1/2" square tube outlet with a 3/4" round tube. Sounds like its breathing much better and surprisingly not that much louder. Probably cant try it in the wood till the weekend.

Chris J. · Mar 5, 2012

Nice job, Mark,

but what the heck are you doing messing with red & black saws :laugh:

?

cambl · Mar 5, 2012

Geez, that muffler outlet should let it breath! Always good to see an old 920 still working.

Modifiedmark · Mar 5, 2012

Chris J. said:
Nice job, Mark,

but what the heck are you doing messing with red & black saws ?

Ah, just waiting for the next lime green one that I dont have to appear. :laugh:

cambl said:
Geez, that muffler outlet should let it breath! Always good to see an old 920 still working.

Yeah but that inner baffle plate being opened should make a bigger difference.

cbfarmall · Mar 5, 2012

Modifiedmark said:
I had already swapped some Husky 77 bar studs to the 920 so the Husky bars would be a direct bolt on but they were a little shorter on both ends then I liked so I turned a set up from scratch.

The muffler was quite restricted so I ground out the inner plate and replaced the small 1/2" square tube outlet with a 3/4" round tube. Sounds like its breathing much better and surprisingly not that much louder. Probably cant try it in the wood till the weekend.

Sure are moving along with that lathe, getting the bugs worked out. Can't wait to see how that muffler will work out.

I think you're going to need to cut out some better spikes next.

Chris J. said:
Nice job, Mark,

but what the heck are you doing messing with red & black saws ?

I knocked some sense into him with the 930.

Chris B.

Modifiedmark · Mar 25, 2012

cbfarmall said:
Sure are moving along with that lathe, getting the bugs worked out. Can't wait to see how that muffler will work out.

I think you're going to need to cut out some better spikes next.

Chris B.

Ok Chris, since you asked for it, I did it, just for you. :laugh:

(you believe that?)

Got a little time today and cut out a set of spikes for it from the pattern we scanned from your 920. They turned out pretty good and I left them raw for now, might paint them later.

Took it out and made about a dozen cuts in the bigger log with it to get it all tuned in and these bigger double dogs sure do make it easier to line up a bucking cut now.

The new bar studs worked out very well, and making the front one just a hair longer worked real well with the new spike being fastened under that stud.

Messed with the tune some and had it plenty rich to begin with but it pulled pretty well. I checked it with the tach and it was turning about 11450. I leaned it out by ear to where it sounded good and the results were it pulled even harder in the wood. It seems to be 4 stroking just a touch and when I put the tach on it again, it was turning 12200. When I was done I shut the saw off at the end of a cut and pulled the plug, and it seems my ear is still right on, by the looks of the plug.

To be honest when this one was put together, I wasnt that impressed with it. Yeah it was good and all just not overwhelming, but I have to say that the muffler mod woke it the hell up and its pulling real well now. Good enough I dont have any plans on getting rid of it anytime soon.

Here are a few pictures.

cbfarmall · Mar 25, 2012

Modifiedmark said:
To be honest when this one was put together, I wasnt that impressed with it. Yeah it was good and all just not overwhelming, but I have to say that the muffler mod woke it the hell up and its pulling real well now. Good enough I dont have any plans on getting rid of it anytime soon.

My 930 ain't running skeered yet but you're sneaking up on it with that 920.

Might have to modify my 920 muffler after seeing your results.

Chris B.

Modifiedmark · Mar 25, 2012

There isnt many around that would scare that 930 period...

The muffler was worth doing, no doubt about it.

cbfarmall · Mar 25, 2012

Modifiedmark said:
There isnt many around that would scare that 930 period...

The muffler was worth doing, no doubt about it.

We'll have to catch up once I get a weekend off. Got that 655BP and a couple others.

Chris B.

Modifiedmark · Mar 25, 2012

Sounds good to me.

Got some things to run past you as well.

Jeff Lary · Mar 26, 2012

That plug looks spot on to me as well .Nice job on the Muffler as well I like the pipe is it brazed on ?.I have a question about a Jonsered muffler maybe you or someone will know the answer.
I had my sons 2040 turbo here last week and I wanted to do the same to his muffler but I could not get it off the saw? I took out the two obvious bolts but it still wouldnt come off.There seems to be another holding it on some place like (inside ? ) but I cannot see any more.I did pry his slot open a little more and wow what a diffrence. Can someone explain how to get a 2040 muffler off for me Just too damn stupid I guess. Very nice Job Mark.

Dan_IN_MN · Mar 26, 2012

Jeff Lary said:
That plug looks spot on to me as well .Nice job on the Muffler as well I like the pipe is it brazed on ?.I have a question about a Jonsered muffler maybe you or someone will know the answer.
I had my sons 2040 turbo here last week and I wanted to do the same to his muffler but I could not get it off the saw? I took out the two obvious bolts but it still wouldnt come off.There seems to be another holding it on some place like (inside ? ) but I cannot see any more.I did pry his slot open a little more and wow what a diffrence. Can someone explain how to get a 2040 muffler off for me Just too damn stupid I guess. Very nice Job Mark.

Jeff

I searched the net for an IPL for the 2040. It looks like there is a third screw hiding under the cover.

Dan_IN_MN · Mar 26, 2012

Nice close up!

Modifiedmark said:
.........

Mark

Nice close up! I think I'll have to break out the real digital camera I want to document a project! My cel does fine with the distance shots.....up close not so hot. The problem is...mine is a dinosaur (4 AAAs!) and it eats batteries!

I tried to REP you! I guess I'll have to find some worthy members to hit a few time.....

Jeff Lary · Mar 26, 2012

manyhobies said:
Jeff

I searched the net for an IPL for the 2040. It looks like there is a third screw hiding under the cover.

Thanks a bunch I just found the same thing I agree under the outer cover there seems to be a small screw inside.

Modifiedmark · Mar 26, 2012

manyhobies said:
Mark

Nice close up! I think I'll have to break out the real digital camera I want to document a project! My cel does fine with the distance shots.....up close not so hot. The problem is...mine is a dinosaur (4 AAAs!) and it eats batteries!

I tried to REP you! I guess I'll have to find some worthy members to hit a few time.....

LOL, I just found out a couple weeks ago what that Macro setting was and that my camera actually had that setting. :hmm3grin2orange:

Jeff I think your question was answered.

Jeff Lary · Mar 27, 2012

Modifiedmark said:
LOL, I just found out a couple weeks ago what that Macro setting was and that my camera actually had that setting. :hmm3grin2orange:

Jeff I think your question was answered.

Thanks Mark I think I will be all set next time I get my hands on it.Is Marco for closeup pictures?

SawTroll · Mar 27, 2012

Jeff Lary said:
Thanks Mark I think I will be all set next time I get my hands on it.Is Marco for closeup pictures?

Macro, not Marco! :msp_wink:

SawTroll · Mar 27, 2012

Jeff Lary said:
Thanks a bunch I just found the same thing I agree under the outer cover there seems to be a small screw inside.

Looks like there are some crap in there that is easy to "loose" as well! :msp_wink:

RiverRat2 · Mar 27, 2012

manyhobies said:
Mark

I tried to REP you! I guess I'll have to find some worthy members to hit a few time.....

I got him for ya,,, yeah that saw will live a long time tuned like that!!!

roncoinc · Mar 27, 2012

Dang Mark causing trouble for me again .

after reading this thread i decided to pull a 920 down off the shelf and check it out.
found the p&c are toasted.
dissapointment..

New bar studs and muffler mod for the Jonsered 920.

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