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2 cycle engines almost all share the same characteristics when setting the carb. this link should get ya going. remember if the piston is damaged you wont pump fuel. carb adjustment screws dont adjust themselves. google(piston blow by) http://www.tillotson.ie/docs/techinfo_HS_US.pdf
When you buy a chainsaw the carburetor is set to run at sealevel basically. The fun thing about chainsaws is you can go to the top of the mountain and cut firewood. There is a lot of difference in elevation so the carburetor settings you use at your house might not run good at the top of the mountain so it is benificial to know how to quick tune your chainsaw.
You need to set the mixtures for the carburetor. There is usually a rubber grommet on the side of the housing near the carburetor. You will find a Low and High adjustment screw. The default setting for the H and L carburetor jet is usually to turn them in all the way till they stop and back them out a turn and a half. You should start the chainsaw and warm it up untill it will run without choking. Make sure that the air filter is cleaned. Start by turning the low adjustment screw out. You will notice that the rpms should start increasing. keep turning it out until the rpms start to drop then turn it back in a quarter of a turn from where it idled at the fastest rpm. At this point you may need to adjust the idle adjustment till the saw idles at a good speed but not fast enough that the chain turns. You may need to readjust the idle speed so the chain doesn't turn during idle. To set the high adjustment screw will require that you run the saw at max RPM. It may be a good idea to get someone to hold the saw so the bar doesn't hit anything while you're doing this. Hold the throttle trigger all the way down and then turn the high adjustment screw in and out until you find maximum rpm. Turn the screw back in a quarter turn. Your saw is now tuned for the elevation you're currently at.
Most saws will have a high, low and idle screw adjustments.
First make sure we are dealing with a clean air filter, clean with air or tap air filter and brush to remove saw dust. Replace fuel if it is a season old or older. (Fuel filter replacement if it has seen years of use.)
2nd GENTLY turn the high screw clock wise until it bottoms out and then counter clock wise 1 and a quarter turns.
3rd do the same for the low idle.
It should run and idle at this point, let it warm up before making final adjustments. If it dies when giving it gas then more than likely it will need further adjustment on the low idle screw.
If it is really stubborn, often times the the ports are full of sludge from the bad fuel. I prefer to remove the bar and chain especially for the novice. Start the saw, secure with another set of hands if need be, turn the idle screw in to quicken the speed a little. Now you can work the low and high screws back and forth 1/4 turn while the saw is running, periodically giving it full throttle. That should be enough to dislodge buildup replace bar and chain and then your final adjustment.
If not you may have to look else where as in an air leak.
If the two screws are side by side, one is the high speed mixture screw and the other is the low speed mixture screw. To set the high and low adjustment screws, tighten the screws in until they stop, don't force the screw after it stops. Back each screw out 1 1/2 turns. The engine will start and run here if everything else is ok. Fine tune each adjustment screw by closing the screw off (CW) until the engine runs rough. Back the screw out (CCW) until the engine smooths out. Run the engine at full speed and adjust the high screw. Let off the trigger and adjust the low screw. Once the mixture screws are adjusted, you can turn the idle screw to adjust the idle speed. It can take some time getting it all adjusted.
There is no fixed carburetor setting on these engines, just two screws to adjust low-end and high-end operation. Special tool may be required, there are about a half-dozen screw head standards. Check eBay for tool. Get the engine to run and idle fast (idle adjust) so it doesn't stall, adjust low-end screw so that engine doesn't hesitate or sputter when accelerated. Adjust high-end screw to run fast and smooth on full throtle. Readjust idle to normal.
All carburetors have 3 screws high and low and idle, then screw high and low all the way in, then turn them back 1 and half that should be factory settings go from there. start with the high idle back it out slow until it sounds good. My blower ran good on two turns out on high idle then three turns on low idle. Good luck...
Most poulan chain saw have three screws idle, high, and low.. if you look air filter cover you will usually see three holes and the high and low will usually have plastic covers on it.. adjust the low 1/4 of a turn and the idle screw in about 1/4 or until the idle picks up... On the plastic cover where the three holes are you will see H which is High L which is Low and I which is Idle... Let me know if you have any problems.. thanks
Not knowing the model, you can always look on the body of the carburetor, there should be an "H" for the high speed mixture screw and an "L" for the low speed or idle mixture screw. Both screws should be set initially 1 to 1 1/2 turns out from seat and then the carb. will have to be fine tuned from there. The high speed screw is adjusted when the throttle is in fast position, at 1 1/2 turns out you should have a slightly rich mixture so you may need to slowly turn it in until you hear the saw's rpms start to increase. You want to find a medium point between too rich and too lean. The low speed or idle mixture screw is set the same way just at idle rpm instead of full throttle, find a medium between too rich and too lean. You should be able to throttle form idle to wide open without any "lag" or "stumbling". You can also offset any rpm change at idle with the idle speed screw (not to be confused with the idle mixture screw). Hope this helps.
The standard setting on needles is to screw them in all the way and then back them out 1 and a half turns.
You need to set the mixtures for the carburetor. You will find a Low and High adjustment screw. turn the low adjustment screw out. You will notice that the rpms should start increasing. keep turning it out until the rpms start to drop then turn it back in a quarter of a turn. You may need to readjust the idle speed so the chain doesn't turn during idle. Do the same for the high adjustment screw.
The screws are for high and low. Start by tighting the screws . Then unscrew both about 1-1/4 turns. Work on one at a time. Get the high adjustment dialed in first, then work on the low or idle.
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