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What makes a chain saw run full blast?

Once cranked, chain saw runs only at full throttle.

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I suggest the throttle lincage is disconected
or the spring is broken

Posted on Jul 25, 2009

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Posted on Jan 02, 2017

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Describe your "Chain Saw -


A couple of things too check here, remove the air filter and clean, remove the spark arrester gauze in the top of the muffler, it is held with a single screw, once the screw is out pull the tab to the side and out, this gauze should be clear and not full of carbon, clen or leave out.

Aug 21, 2011 | Husqvarna "Chain Saw - 16" Bar, 3 Hp

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42cc 18 inch craftsman chainsaw model 358-351910-18. Saw runs great at idle or while not cutting wood, when starting to cut wood just after the entire bar gets into the wood engine bogs down and chain...


Generally this is a fuel / air ratio problem. Usually it can be solved by a carb adjustment. On the carb there are usually two screws, one marked low or L , the other marked high or H. Low is your adjustment for idle mixture, high is for mixture at full throttle. The saw should Always be adjusted to run well during the cut. Make adjustments a little at a time, then try The saw. Continue small adjustments untill the saw is performing well at full throttle while Cutting.

Aug 09, 2011 | Poulan Pro Chain Saw 46cc 20"

2 Answers

What are the steps to getting the chain saw started and idling? What are next steps to cut tree limbs and oil the chain? This chain saw was given to me without a manual.


If you are a complete novice you should seek some training before attempting to use the machine, as you do not say what model this is we will go through basic starting procedures, fill the fuel tank with fresh fuel mixed with two stroke oil at 25-1, fill the chain oil tank with a non fling chain oil, switch the ignition switch to on, pull the choke fully out, push in the deco valve if fitted, place the machine on the ground, with the tip of the bar away from any obstructions, put your right foot through the back handle to hold the saw down, place your straightened left arm and hand onto the top handle again to hold the machine, now with your right hand crank the engine until it fires once, at this point push the choke fully back in, crank the engine once again until it fires up, flick the trigger to dissengage the part throttle , the machine should now idle.
Be carefull.

Jun 05, 2011 | Poulan Garden

1 Answer

Have new 450 and is very difficult to start. Lost or didn't get book. How do I start it and re-start it while still warm??


Start procedure is, push the primer as many times as it takes to 3/4 fill the bulb ( you cannot over prime it ) pull the blue choke lever fully out,place the saw on the ground with your right boot through the back handle, crank the engine until it fires once, do not continue to crank the engine with the choke out ( they will not run on choke, only fire ) push the choke fully home, crank the engine until it starts, blip the throttle trigger to bring the saw to idle, warm engine, pull the choke fully out and push in again without cranking engine, this will engage the part throttle, crank the engine until it starts, blip the throttle to bring the engine to idle.

May 18, 2011 | Husqvarna 450 e-series 18" Chain Saw

1 Answer

Saw will not idle down, runs full


First thing to do is remove the top cover, now check that when you release the throttle trigger the spindle on the carb returns ahainst the idle screw stop, if not check the linkage is not sticking and holding it open, if ok make an adjustment to the idle screw, if this screws right out and the revs still do not decrease, then you have an air leak through a crank seal or gasket.

Feb 11, 2011 | Homelite Gas, 20 In. Bar, 46 CC, Chain...

2 Answers

I have difficulty starting my Gardenline 49.3cc chainsaw. Please let me know what the correct starting proceedure is.


Genral starting procedure on a chain saw is as follows, put fresh fuel into the fuel tank, top up the chain oil tank,switch the ignition on, if the saw has a half throttle position on the trigger lock this, if the saw has a primer depress this as many times as it takes to 3/4 fill the bulb, pull the choke fully out, if it has a deco valve push this in, now place the saw on the ground with the chain brake on and crank the engine ( always have the saw body between you and the cutter bar,NO left hand starting, NO drop starting ) the engine will only fire once on full choke, do not continue to crank engine after the first fire or you will flood the engine, push the choke back in, crank the engine until it fires up and runs,release the chain brake and blip the throttle to release the half throttle device.

Jan 22, 2011 | Garden

1 Answer

Relatively new (used once) 45cc petrol chainsaw starts fine but when you use the throttle to make the chain go round it does so slowly before cutting out. There is plenty of fuel and plenty of chain oil


Make sure the chain oil is reaching the chain. Can you turn the chain by hand fairly easily? If not, then the chain tension should be adjusted--loosen the drive cover fasteners enough to allow the bar to move up and down somewhat. Turn the chain adjuster screw CCW so that the chain can be moved by hand, but the chain should not droop from the lower bar edge. Re-tighten the cover fasteners and recheck the chain tension. If ok, try to run the saw again--it should run at full speed, 4-stroking lightly, but immediately 2-stroking when cutting. Make sure the fuel mix is fresh using a modern synthetic saw oil and shaking the container thoroughly each time just before filling the tank to prevent oil starvation. Check the fuel filter, air cleaner, and muffler for plugging. Check the fuel lines for decay or other damage. Hope that some of this helps!

Jan 04, 2011 | Garden

2 Answers

Chainsaw dies out when gas is pressed to full throtle


Carb needs teardown and cleaning. May be a stuck float or clogged jet.
Spraycleaner just wont cut it.

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Apr 05, 2010 | Poulan Pro Chain Saw 46cc 20"

1 Answer

My chain saw bogs down like it is binding up with the chain on or off


I do not recommend operating your saw at full throttle without the bar and a properly adjusted chain.

Remove clean and reinstall the air filter and muffler, do not forget the spark arrestor. If it the problem persists turn the "H" needle valve CCW 1/8 turn. Better?
This is a very good adjustment procedure.
Carburetor Adjustment by Madsens.com
http://www.madsens1.com/saw%20carb%20tune.htm
CW is leaner; to lean will destroy the saw. If over tightened closed (CW) the adjustment screw faces are easily marred; marred adjustments are difficult to impossible to set properly.
Clean the air filter; adjusting with a dirty filter can cause a run lean condition once cleaned and the saw run.

There are 2 wav (sound - idle & full – may not be highlighted) files that I find most helpful, I think you will too. HTH
Lou

Feb 19, 2010 | Echo Garden

1 Answer

Poulan chain saw after carb rebuild.


Is thereadjustment somewhere on the saw
I think there is 2 .

Feb 03, 2009 | Poulan Wild Thing 2375 18" Gas Chain Saw...

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