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How do you adjust the high and low jets on a Poland 38cc chain saw

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SOURCE: need to adjust carburetor jets of homelite chain saw

what is the adjustment for high and low settings on a homlite 330 ?

Posted on Feb 06, 2009

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Settings for mixture screws


Most Chain Saw Engines Have Three Carburetor Adjusting Screws:
1. Idle Speed/Throttle Stop - This is the adjustment that controls how much the throttle valve (butterfly) stays open when the throttle trigger is released. If this adjustment is set too low, the engine will die when the throttle trigger is released. The throttle valve (butterfly) simply cuts off the supply of combustible air/fuel and the engine stops. If this adjustment is set too high, the high idle speed will cause the centrifugal clutch to engage and the chain will run. This is a dangerous condition and should never be allowed.
2. Low Speed Fuel Adjustment (marked L on carb, this is the low speed jet)- This is the adjustment that controls the proportion of fuel in the combustible air/fuel mixture at idle speed. An adjustment that is set too rich will cause the engine to load up and die at idle speed. A mixture that is too lean will starve the engine and cause it to race or surge. An extremely lean adjustment will cause the engine to die, too.
3. High Speed Fuel Adjustment (marked H on carb, this is the high speed jet) - This is the adjustment that controls the proportion of fuel in the combustible air/fuel mixture at cutting speed. It would not be accurate to say that this is the most important setting, because all of these adjustments need to be accurate for a saw to perform its best, but this is the adjustment that determines how the saw runs in the cut. An adjustment that is set too rich will not allow the saw to reach the RPM level necessary to build maximum power. Throttle response may also be sluggish and the engine would smoke and perform poorly. A mixture that is too lean will allow the engine to reach an RPM level where bearing failure and cylinder seizure are likely. It will also lack power in the cut and tend to run very hot.
The preceding information briefly explains rich and lean running conditions. It also identifies the three adjustment screws and their function. It should be noted that some chain saws lack the high speed adjustment needle. These saws have what is called a "fixed jet" which is set from the factory. "Fixed jet" carburetors are used to prohibit the saw operator from setting the adjustment too lean and damaging the saw. Unfortunately, they also often prohibit the saw from achieving maximum performance.

Apr 11, 2016 | Garden

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Are the carb jets clogged? The low and high carb adjustments fail to change my Husc. saw speed. It says running (rough) only when the trigger is depressed. Fresh gas, new air filter, and new plug. The


Fuel, Chain saws are the most pickiest when it comes to fuel, I normally buy the Premixed Fuel already made for me at lowes they have a 40:1 and a 50:1 ratio mixes. I would try that.

Sep 28, 2014 | Husqvarna Craftsman 36cc, 16 In. Gas Chain...

1 Answer

How to adjust carb. on a poulan chain saw 38cc model 2175


If the carb is adjustable, it will have two small screws on it ( maybe covered with a plastic cap) One is low speed and the other is high speed. Adjust very little at first.

Sep 24, 2014 | Garden

1 Answer

Craftsman 28cc 16" chainsaw wont idle


If you've already tried the idle adjustment screw and that didn't work, you need to turn the low side adjustment CCW a quarter turn and try again.

Jul 06, 2014 | Craftsman 38cc 16" Gas Chain Saw

2 Answers

How to adjusted the high and low in a ryobi rcs3535c4


The initial hi and low jet settings are in the owner's manual or sometimes stamped on the side cover next to the carburetor. If you do not have a manual go to lawnandgarden.manualsonline.com to get one.

Oct 04, 2013 | Garden

2 Answers

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

My Homelite ZR10926 16-Inch 33cc Ranger it is starting, idling, it dies when I accelerate it. I assume is the carburetor, maybe ? thank you.


It probably is not getting enough fuel. Check the filter in the tank. If it has been sitting with stale gass this filter plugs up.
Try running the engine with some choke. If this helps, try adjusting the carburetor high speed screw.

Jun 04, 2011 | Homelite ZR10926 16 Chain Saw

1 Answer

I have a 38cc champion chainsaw. The hi, lo and idle settings are all wronge so i cant get working correctly. Could you please tell me how to get the wright settings for it? cheers Nick


Hi Nick and welcome to FixYa. I am Kelly

If your starting from scratch do this:
1. First off completely remove the jets one at a time and inspect for a point on the end of the jet. If one of the points is missing it is stuck in the body of the carb and will have to be removed. (I have had to replace carbs because of this due to the fact the piont proke off in the body and could not get the broken piece out of the carb body)
2. Re install each jet and screw it in until it reaches the closed position until they just stop moving DO NOT over tighten.
3. Open each jet 1.5 turns from closed
4. Start the chain saw and accelerate to max speed
5. Adjust the high jet so that under no load it no longer sputters / misses
6. Let unit return to idle
7. As soon as it reaches idle accerate to full throttle again
a. Repeat the return to idle and accelerate process and adjust the low jet setting so that the chainsaw does not hesitate when you rapidly accelerate the engine.
8. Adjust the idle speed so that the chain saw idles but does not rotate the chain.

That is pretty much 2 jet / 2 cycle carb adjustment 101.

Make sure you have the air filter installed when making final adjustments as air filters can cause it to perform differently when installed vs removed especially if the filter is not clean.

Make MINOR 1/8 th turn or less adjustments as your going through the adjustment process!

Thanks for choosing FixYa.

Kelly

Oct 04, 2010 | Garden

1 Answer

Macculloch 14'' (350)chain saw,and cannot get my saw to fire up there are three adjusting screws marked T L H how many turns back for each screw from the closed position to enable a rough setting to fire...


t is your throttle stop
l is your low speed jet for fine tuning low rpm.s and idel itself.
h is high speed jet.

basic settings for the L and H jets are one turn out / open

throttle stop will vary but once you have it ideling you can tune that one while you are holding the trottle then go back to the L jet till u got it running sweet. then re adjust throttle stop if necessary. now move on to high speed jet.

Mar 03, 2010 | Measuring Tools & Sensors

3 Answers

Need to adjust carburetor jets of homelite chain saw


what is the adjustment for high and low settings on a homlite 330 ?

Jan 11, 2009 | Garden

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