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Races will not idle down so the chain will not turn

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  • kerry littleton May 11, 2010

    if it races the chain should be racing too please clarify

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  • Master
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Your not clear on the saw model or manufacturer. Is the throttle in the start position (Fast idle)? Is the chain brake engaged (Must be disengaged before chain will turn)? IMO the chain brake should not be activated before start, (hard on clutch) but may save your leg if you drop start! I start mine on the ground with right foot in rear handle with the brake disengaged.

Posted on Sep 03, 2009

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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

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My chain saw 'races' when it warms up.


Try starting it with the chain brake on,once brake released and chainsaw revved it should go back to idle speed if not adjust the idle speed or take it to a repair shop

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Reference the Husqvarna 350 chainsaw. Why does the chain continue to turn at idle? I just installed a new clutch. Adjusting the idle down causes the saw to shut off upon trying to accelerate.


Sounds like the clutch is still grabing. Easy solution is to apply the chain brake at idle to stop the chain turning. Try adjusting the L screw for a smoother idle.

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I have a Makita DCS640120 Commercial Grade 20Inch 64cc and when i turn it on the chain automatically moves how do i fix it to where it will idle till i press the trigger?


Turn the idle speed screw CCW till the chain stops turning at idle, but the engine continues to run. Make sure the carburetor fasteners are tight. Remove the chain cover, bar, and chain. Spin the outer drum of the clutch to check the bearing which lies between the drum and internal components. If it doesn't spin freely, try oiling the drum bearing area and work it into the bearing. If no help, plan on replacing the clutch mechanism. Hope some of this helps!

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When idling chain keeps turning


if this is happening, then your chainsaw is just idling to fast, you need to turn down the idle speed a little. on the carby, there are 3 screws, 2 small (H), (L), and a larger screw is the idle speed one, turn anti - clockwise to reduce idle speed.
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Carburator settings


If you have played with them the only way is to get it going pretty well is" ....
find the idle screw - usually larger - and turn in 1/2 a turn - hopefully that will keep it running - then find the 'slow' running screw turn it in until it stops then turn out 1 and 1/2 turns. Leave the fast one alone.
Get it started then adjust idle screw so its faaster if need be.,, now slowly turn the 'slow' screw in then out say 1/2 turn and listen for it either speeding up or slowing down leave it at the point where it sounds ok and try giveing a few 1/2 speed rev ups. If it goes back and idles as before - leave it.

The fast screw... (first make sure your exhaust outlet is totally unblocked - the slightest restriction here will cause it to never run right at high speed). Start it up and then try full throttle - same thing as before try adjust the fast screw first in a little then out until it runs well at what seems the faster speed it can - then check that it accelerates well from idle to full speed. If not adjust it a little more until it does.
Once it will idle ok and return to idle and also run full speed, then you can back off the idle screw until it will idle without the chain racing arond the bar.

Bear in mind th chain wil be racing around while you adjust it so keep fingers kids and idiots well away..because you are adjusting it with that chain moving..

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Chainsaw blade turns constantly, even when idling.


If the chain turns on the bar when the saw is at idle, then the idling speed is still too fast. If you turn the idle screw down until the chain stops moving, it should still idle well enough not to stall. The chain should not move at idle.

If you turn the idle screw down until the chain stops and it won't idle, then you have to adjust the low speed carb screw. Odds are if you back off the idling speed until the chain stops moving you'll be fine. The idle screw is usually the one with a spring under it to maintain torsion. Somes the throttle plate, the one with the throttle wire against it, will rest against a screw stop for idle control. This is the easiest adjustment. Just back it out until the plate returns more and the speed will drop.

Make sure it is lubricated and not clogged up with sawdust.

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