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How to set idle on model 2150 turbo jonsered chainsaw is idling high and chain is moving when not in use !!!!

Saw is idling high how to set correct idle also chain is in continuous movement and will not stop even when saw is not in use but motor running

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You adjust the T screw at the carburetor. Don't adjust the L or H unless your having performance problems.

how to set idle on model 2150 turbo jonsered chain - 25319302-luuq2o0t1ccvsxgxp1ajlj0a-3-0.png

Posted on Dec 12, 2014

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I am looking for base settings for carburetor jets on a Jonsered 2036 turbo saw


Try screwing the "H"screw in then out one and 1/4 turns then rev the saw up and adjust till in really start,s to rev cleanly the "L" is for low revs at idle adjust till it idles at required rev,s.

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Jonsered 2149 turbo , does any one know the factory settings fornthe carb ? Iv turned the H L in all the way waiting instructions , what about the idle ? Thanx


Yes I do. Do not over tighten the H and L needles you will ruin the needle seats (clockwise closes the needle jet, counter clockwise opens the needle jet) There is no air mixture needle on a chainsaw carb (2 cycle engine) all are gas mixture needles H - high speed operation, L - low speed operation. [The saw carburetor operates like a 4 barrel carb on a 350 chevy, runs on 2 but kicks in all 4 when you hammer it.] Turn the H needle to 1(one) full turn open (counter clockwise). Turn the L needle to 1 1/4 (one and one quarter) turn open (counter clockwise). NEVER EVER close the H needle to less than 3/4 open or the L needle to less than 1 turn open. If you do you will burn the saw up from lack of oil lubrication. [I have several Jonsereds saws a 52E, 451EV, 49SP, 520SP, 621 race saw, 630, 70E, 70E race saw, 80E and last but not least a 90E. I worked many years for the importer and distributor of Jonsereds as a Territorial Rep. All my saws run like a top. My newest saw is a 1984. I chainsaw carve and cut firewood with all of them year round. In short I like-em, they're the best.] I find that all my saws run the best and strongest with the carb set at around 7/8 turn open on the H needle and just above 1 turn open on the L needle. The idle screw I set last after the saw responds correctly to the carb settings. I quick throttle the saw to make sure the saw picks up RPM and doesn't fade out, put in a log to make sure it maintain tourque under load and not bogg down (tweak the H & L if needed, remembering the 7/8 - 1 1/4 rule I adjust the idle screw to where the saw sound smooth and un-labored at idle. I never let it idle to where the chain moves when it idles. For safety reasons. Hope this helps. EdN

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1 Answer

I have a jonsered 2149 turbo


Hi Stian:
If this is anything like the chain saws that I know and love, it would get "tuned" on site for where you're running it. (Altitude changes can affect performance).
- Normal procedure.
Start it up and let it warm up..
- With saw running at full throttle, Set high speed to leanest (screw in until RPM drop, then screw in 1/3 to 1/2 turn.
- Throttle back. set idle screw... smooth but chain not turning.
Hope this helps.

Dec 04, 2015 | Garden

1 Answer

Chainsaw won't idle- runs fast only


Gently Tighten the carb adjustment screw fully tight then adjust it out 360 (full turn) then again a further 180 ( half a turn) and your idle speed should be set correctly. Let me know how you get on

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My Johnsered 625 chainsaw clutch work????


is it a high idle? most chainsaw's chain continues to turn with a high idle.

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Chainsaw chain oiler not working


There is probably a filter on the bottom of a hose within the oil tank. Go through the tank fill cap with a blunted rod. Move it slowly you should find the hose. Draw it gently toward the opening. You can probably find a new filter at a Husqvarna (parent company) dealer if you don't have a Jonsered dealer handy. Oil pump replacement is complicated. Any good chainsaw mechanic can replace it regardless of what saw they sell. Arboristsite dot com is a buch of chainsaw nuts (Eye r 1). They will give you better guidance. Please do a searh in the chainsaw forum before asking "how do I fix my saw", the answer has almost certainly been asked. Spike60 is a Jonsered dealer and is always helpful. HTH Lou

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1 Answer

Idle is off??


hi leobowdy

disassembly the carb and carefully clean it.Check the air filter,the fuel line and fuel filter,check the needle,lever,small spring and the screen filter from the carb.Check the sparkplug.
high speed H=2 turns,low speed L=2 1/2 turns,adjust T
When chain saw starts adjust H,L and T accordingly.

cheers savumihai71.

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