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Carburator problem it cuts out. saw only run at high speed

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Turn both H and L adjustment screws CW to stops (lightly), then back out CCW 1-1/2 turns. Engine should idle and run fairly fast with these settings. If it won't, then remove the carburetor and disassemble it. Clean all metal parts with spray carburetor cleaner, and blow out with compressed air. Check the condition of the rubber and plastic parts for stiffness, holes or cracks. Re-kit if any found bad. Check the fuel lines for condition. Install the H and L needles as above. Start the engine--it should now idle and run up. Warm the engine up, then apply full throttle and adjust the H needle (probably CW) to get the engine up to maximum 4-stroking speed, but it should smooth out immediately with a light load (cutting). Then drop to idle and adjust L for best idle, yet rich enough to allow engine to follow the throttle. Adjust the idle speed a little below where the chain stops moving.

Posted on Sep 08, 2009

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SOURCE: What tool do I need to adjust the high & low

Should just be a little bladed screw driver, most are, turn the screw very little, 1/4 turn at a time till something changes, they are sensitive. If you run out of adj and nothing has changed, turn the screws in all the way, both of them, then out 1 1/2 turns, this will get you running, you can fine tune from there.

Posted on Aug 29, 2010

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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

1 Answer

How to stop saw from bogging

Two things. First, is the chain dull? Second, if it develops a "throaty" sounds when you're cutting instead of the "crisp" sound you normally get from a chainsaw or weedwhacker or dirtbike... then the carburetor's running rich - it's "four-stroking". Try fiddling with the two mixture adjustment screws; one should be for idle mixture, the other for high-speed mixture. Get the saw idling and turn one of those screws clockwise ONE-QUARTER TURN. If the saw's idle doesn't change, turn that screw one more quarter-turn. if the saw's idle still doesn't change, thats the high-speed mixture screw.

If the saw's idle changes while you're doing that, then you're on the idle-mixture screw - return it to exactly where it was and adjust the OTHER screw clockwise a quarter-turn. Now try cutting - see if you've improved the saw's performance. If it's still four-stroking, try another quarter-turn.

If you go too far, the saw won't want to run at all at higher speeds... so you'd need to back up the screw the other way. Run it at the richest (most counterclockwise) position where it doesn't four-stroke under load.

Jul 25, 2014 | Dolmar Cyl & Piston Cpl Ps-510 - DM...

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 to get one.

Oct 04, 2013 | Garden

1 Answer

Stihl ts400 runs rich and wont idle

Sounds like it is leaking on the inlet needle, a pressure test of the carb will quickly tell you this, the needle will have a rubber tip, if dust has gone through the carb the needle seat may be worn, the needle is replacable unfortunatly the seat is not, the metering lever is also adjustable, if it is set too high the needle will leak, it is also important that on the metring side the gasket goes on first followed by the diaphram, the gasket acts as a spacer, the metering lever should be level with the sides of the carb body, if too high simply bend it down, if the metring lever is high this is a good sign the rubber tip of the needle is worn.

Feb 04, 2013 | Stihl Concrete Cutoff Chop Saw Clutch...

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

Chain saw carburator settings for husqvarna 61

Turn both screws CW to stops (lightly), then back out CCW 1-1/2 turns each. This is a basic setting and the engine should start and run. Allow the engine to warm up, then pull the throttle full on. Turn the H jet screw CW until the engine starts to speed up, but still 4-strokes. Proper adjustment occurs when the engine is 4-stroking, but immediately 2-strokes when cutting. This gives best power and lowest heat. Release the throttle and adjust L jet CW until the engine idles fairly well, but will allow the engine to 'follow the throttle'. Adjust idle speed screw so that the chain stops turning, but the engine continues to run. Hope this helps!

Jun 06, 2010 | Husqvarna "Chain Saw - 16" Bar, 3 Hp

2 Answers

What are the adjustments for the high and low mixture screws on the carbureator? the carbureator is from an echo 500vl chainsaw.

Echo thinks your actual model number is CS-550EVL. Page 14 lists the starting points for carburetor adjustment here:
Additional manuals for you saw can be found here:
More choices can be found by typing CS in the model: window then clicking “Search”.

Once initialized this is the best procedure I have found.
Carburetor Adjustment by
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

Feb 13, 2010 | Garden

1 Answer


The make, model, and occationally the serial number help us solve your problem.

Does the engine quit running? (Carburator needs adjustment)
Or does it continue running and chain stops? (need clutch refaced or replaced.) (to aggressive a chain for the size of the engine)

I think you replaced parts unnecessarily. Maybe quicker and cheaper to visit your friendly neighborhood chainsaw shop. A good one can repair it even if they do not sell your brand.

Sep 09, 2009 | Homelite Garden

1 Answer

I would like to know how to adjust the carburator of McCulloch 3516 chainsaw 35cc/cm 46759-77

the carbuator has two 2 adjusting screws on is high side and the other is low side.start by turnig them both in until they touch turn them both out 1 1/2 turns.this should start and run saw.throttle saw up to full throttle and adjust high side in until you get the best RPM out of not adjust high side any less then 7/8 turn out from bottom.if you do you will burn saw up from to lean burn.once the high sie is set now adjust low side until the saw will idle by it's self.let me know if this helped you.......

May 02, 2009 | Garden

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