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Oct 23, 2020 - 2:22:48 PM
5879 posts since 9/5/2006

so i got out my old jonsred 2149 turbo... did the normal cleaning and stuff,,, got a new plug ,,,fresh fuel and oil mixture.
this is what is going on.... went to start.hard to pull... and the compression release is pushed in !!!!
so i pulled the plug out and pulled it easy peasy... so i sprayed so WD40 down there pulled it a few times.. sprayed some more and let it set for a day.
went back pulled it again,, easy peasy... put plug back in ,,, pulls hard again. could i have a bad compression release or should i look somewhere else?

49 cc

plug gap   at 020

Edited by - 1935tb-11 on 10/23/2020 14:25:55

Oct 23, 2020 - 5:12:47 PM

Owen

Canada

6802 posts since 6/5/2011

Looks like the experts are otherwise occupied so....... [tongue-in-cheek] I think I see your problem.  You say, "....did the normal cleaning and stuff,,, got a new plug ,,,fresh fuel and oil mixture."    I'm pretty slack with those things,  and don't have too-too many problems with my small engine stuff.... ergo..........  .

None of my small engine stuff have a compression release, but from what I don't know, your take sounds plausible.... at least until an expert tells me otherwise.   Hopefully one of them can give you something more substantive than I can.

Oct 23, 2020 - 9:24:36 PM
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9723 posts since 8/22/2006

Did you remove your compression release at anytime during your trouble shooting efforts? If not I would suggest replacing the compression release. It could be gummed up.
Oh no I didn’t stay at a holiday inn express just 71/2 years at Beaird Poulan making and breaking Poulan chain saws.

Oct 23, 2020 - 10:41:57 PM

nakigreengrass

New Zealand

5291 posts since 5/16/2012
Online Now

it would only cost a few bucks for a brand new compression valve to find out if that's your problem....I'd give odds of 3 to1 that's what it is.

Oct 24, 2020 - 3:49:38 AM
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OM45GE

USA

101733 posts since 11/7/2007

Replace the compression release valve. They do fail, but also can get clogged by carbon buildup which is more likely your problem.

Carbon buildup can happen over time but is often caused by too much oil in the fuel mix or using the wrong oil in the mix. 

Here’s a link to the owner’s manual for your saw. Fuel mix info is on page 26.

Jonsered 2149 manual
 

Oct 24, 2020 - 3:58:31 AM

5879 posts since 9/5/2006

think i will , like ya'll said it ain't but a few bucks ,,,, i took the muffler off and checked it and the screen to make sure it wasn't clogged up , screen had a little trash but not much.

Oct 24, 2020 - 5:16:05 AM
Players Union Member

DC5

USA

14463 posts since 6/30/2015

I don't know what happened to my post, but it seems to have disappeared. I don't remember everything I said, but based on what happened when you removed the spark plug I would remove the compression valve and it it can't be cleaned, replace it. Least expensive place to start. The only other reason I can thing why removing the plug made it easier is if the plugs are the wrong size and so long that they push against the piston. cheeky

Oct 24, 2020 - 12:58:14 PM

nakigreengrass

New Zealand

5291 posts since 5/16/2012
Online Now

Or...DC5.....you don't get any compression with a plug out....

Oct 24, 2020 - 1:11:35 PM
Players Union Member

DC5

USA

14463 posts since 6/30/2015

quote:
Originally posted by nakigreengrass

Or...DC5.....you don't get any compression with a plug out....


Uhm, yes, the OP said he had no problem pulling the starter rope with the plug out, so he has too much compression and so the logical conclusion is the compression release valve is not working.  Everything else I posted was a joke - thus the cheeky

I was actually the first one to reply, but my post never made it for some reason.  And the jokes are for me, I don't care if no one else finds them funny.

Edited by - DC5 on 10/24/2020 13:11:51

Oct 26, 2020 - 4:54:45 AM

5879 posts since 9/5/2006

yes i get compression out of the spark plug hole,,, i think the compression release is my next move.

Oct 26, 2020 - 9:41:35 AM

DRH

USA

564 posts since 5/29/2018

I have never seen a compression release on such a small saw so things have changed since my saw days. I can tell you those screw-in compression releases are notorious for sticking, leaking, and breaking. Many pro saw owners removed them and plugged the hole. Home users generally wanted them fixed.

The device can usually be cleaned with methanol and a brass bristled brush. If they leak long enough the carbon causes the plunger to stick so that it will neither open nor close.

From your description of the problem it is possible you have fuel mix in the crankcase. If fuel drains into the case over a long period the gas will evaporate leaving a glob of oil in the bottom. Spinning the motor pushes the oil up into the headspace. Oil being non-compressible, it causes the motor to lock. Remove the spark plug and leave the saw upside down on a suitable surface for a day and see if anything comes out.

For reference, a two stroke engine needs about 90PSI compression to start. I once got one started that initially had only 70PSI by spinning it with a drill motor until it overcame ring bypass and had enough pressure to start.

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