Chain Saw 20″ Bar

Experienced gardeners share their insights in answering this question :
There are no covers, just special ‘D’ shaped screw heads that prevent tampering by non-authorized persons (read non-service personnel) mandated by EPA. Not sure where you could buy such a screwdriver.

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However, if you have an older saw, here`s how to quickly tune it yourself. Start by locating the three adjustment screws. They are typically labeled L (low speed jet), H (high speed jet), and I (idler jet).
Regardless of whether or not the engine is running too rich or too lean, bring it down to a very lean mixture by turning both screws a quarter-turn at a time, counter-clockwise, then slowly bringing them back up to an equal and smooth mixture. Listen to the engine to know when you`ve found the right balance.
The letters on the screws represent High (H), Low (L) and Idle (T). The H screw regulates the Air/Fuel mix during high RPMs, while the L Screw does the same during low RPMs. The T screw regulates how much fuel is sent to the carburettor while idling until the throttle is pressed.
Dirty Carburetor (air+fuel)

If fuel sits in the system for too long, the carburetor (and the engine and fuel lines) can become sticky and clog. Remove the air filter and spray the carburetor with carb cleaner—an aerosolized acetone spray made to remove the gunk.

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Carburetor adjustment zama walbro tuneup – whipper snipper stihl fs 38
ANSWER : Too long to print here. Go to the zama web sit and they give you a wonderful procedure for adjusting a zama carburetor. Especially important after you have taken it apart and installed a new carb kit. And even if you get a new carb the initial settings are so called defaults and you should really fine tune the carb for your specific motor.

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How to adjust carburetor on Poulan FL1500 blower
ANSWER : The L and H mixture screws have unorthodox heads on them, but they can be turned. You can buy a tool for the type of head they have on Ebay. I use a plastic automotive type wire terminal connector and tap it over the head of the mixture screw. The 22 gauge ring-eye type works well because it gives you something to grasp and turn the screw with. Here is the manufacturer’s tutorial on adjusting your carburetor.

http://www.zamacarb.com/tipspage.html

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What tool is required to adjust the carb. on a 142e husquvarna chainsaw?
ANSWER : Http://www.ehow.com/how_7241334_adjust-husqvarna-carburetor.html

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How do I remove the clutch on an Echo chain saw??
ANSWER : Backwards to the rotation of the motor, all you need are basic tools to do this.

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How to stop sawdust from coming into the carburetor section and how to adjust the chain oiler. chain seems dry.
ANSWER : Check to ensure the oil opening on the side of the saw housing is not plugged as well as the matching oil groove in the guide bar first. Turn the saw upside down and see if there is a + and a – sign near the sprocket on the bottom. If so, turning towards the + increases flow. Most new small saws oilers are non-adjustable.

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I have a carburetor adjustment problem on my Mantis S V4/B. I had to remove the adjustment screw limiters because the were just turning on the screw shafts and not turning the screws themselves. Thanks to some unneeded assistance, the screws are well out of adjustment now and I can’t get it started. How many revolutions should I back out each of the screws to get back to near-factory settings?
ANSWER :

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Do I have to remove the screws covers to be able to adjust the carburetor?
ANSWER : There are no covers, just special ‘D’ shaped screw heads that prevent tampering by non-authorized persons (read non-service personnel) mandated by EPA. Not sure where you could buy such a screwdriver.

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I have a 5.5 OHV Briggs and Stratton and it only runs if it is choked or half choked. When the choke is open (run position) the motor kills. There is only one adjustment screw, but making adjustments to that does not seem to make any difference. What’s wrong!
ANSWER : Check your fuel filter if you have one.If the mower/weedeater is over a year old, then I recommend that you buy and install a new carburetor repair kit,because the diaphragm will get hard and that will cause it to be hard to crank.Sounds like you will need to clean the carburetor or replace your carburetor internal rubber parts like the diaphgram and O rings.Be sure to use compressed air to blow out all the fuel and air passages.Be careful when blowing out the passages, because there are sometimes small rubber type seats in the bottom of some of the passages.Sometimes you can get by with priming the carburetor or using starting fluid and letting it run a few times like that and it will flush the gunk out of the jets,but most of the time you will need to rebuild the carburetor.Keep in mind that the float for the carburetor must be level when you go to reassemble the carburetor or follow the instrucitons you get with the carburetor kit.When you clean your carburetor and remove the jet screws, you will first need to lightly seat the jet screws.But before you lightly seat the jet screws count the number of turns it takes to seat the jet screws from their original position.Be sure to mark the turns down on a piece of paper.That way when you put the jets back in, you know to lightly seat them first and then turn them back out to their orginal position before you started.
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