Author Topic: Jonsered 2050 wide open throttle problem  (Read 591 times)

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Offline Dave_NH

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Jonsered 2050 wide open throttle problem
« on: November 17, 2012, 11:03:24 am »
I have a Jonsered 2050.  It has been running just fine for almost 20 years.  Gas is fresh, oil is Echo brand, air filter is clean, plug has only about 10 hours on it, saw is cleaned after each use, blade is sharp, etc.

However, now it has a problem after running 10 minutes or so.  The first thing I notice is it will bog down while cutting.  Then, it will not run at all at wide open throttle.  If I back the throttle off to about 3/4 I van get it to finish the cut.  If I use it the next day, it will have the same symptoms after a while.

I would rather not take it to the shop if I can fix it myself.  Any ideas?

Dave_NH

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Offline man of stihl

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Re: Jonsered 2020 wide open throttle problem
« Reply #1 on: November 17, 2012, 12:45:35 pm »
When was the last time you changed the fuel filter? Changed the fuel line? I would start there. It may need a carb kit and\or carb adjustment.
Ron

Offline Cut4fun_

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Re: Jonsered 2050 wide open throttle problem
« Reply #2 on: November 17, 2012, 12:50:28 pm »
After checking above.

It might still be a stiff diaphragm from age or ethanol.   Carb repair kit $8-$15 and 30mins to do.  Just a diaphragm kit $3-$7
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Offline Dave_NH

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Re: Jonsered 2050 wide open throttle problem
« Reply #3 on: December 06, 2012, 01:45:12 pm »
Closure.

Thanks for the input.

A new fuel filter and re-adjusting all throttle settings fixed it.  Ready for another 20 years of trouble free cutting.

Dave


Offline Spike60

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Re: Jonsered 2050 wide open throttle problem
« Reply #4 on: December 07, 2012, 03:21:00 pm »
What color is the spark plug electrode?
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Offline Cut4fun

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Re: Jonsered 2050 wide open throttle problem
« Reply #5 on: December 07, 2012, 04:38:58 pm »
What color is the spark plug electrode?

Bob are you seeing any different looks of the plugs with ethanol gas now days?

Reading spark plugs link  http://www.dansmc.com/Spark_Plugs/Spark_Plugs_catalog.html
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Offline Spike60

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Re: Jonsered 2050 wide open throttle problem
« Reply #6 on: December 08, 2012, 11:27:57 am »
No not really. A good running saw should still produce the usual tan color.

My question was along the line that the OP might have an air leak.

Next thing I would look at is the throttle cable, and make sure that the throttle plate is fully closing when the trigger is released.
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Offline Cut4fun

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Re: Jonsered 2050 wide open throttle problem
« Reply #7 on: December 08, 2012, 12:34:15 pm »

My question was along the line that the OP might have an air leak.



Gotcha, your thinking he might be 2-3 turns out on each.  Hopefully he will get back and let us know.
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Offline HolmenTree

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Re: Jonsered 2050 wide open throttle problem
« Reply #8 on: December 15, 2012, 09:36:27 pm »
Ignition module may be breaking down when heated up.

Offline HolmenTree

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Re: Jonsered 2050 wide open throttle problem
« Reply #9 on: December 19, 2012, 10:28:20 am »
Closure.

Thanks for the input.

A new fuel filter and re-adjusting all throttle settings fixed it.  Ready for another 20 years of trouble free cutting.

Dave


OOPs, I didn't see OP found the problem before I posted :-[

 

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