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Start out with both screws at 1-1/2 run saw full throttle and adj. screw closest to air filter, which should be "H" screw it in slowly till you reach max rpm's then reverese the screw just till it starts to slow down, keep in mind don't take forever to do this cause you don't want it running lean (max rpm's) because it will COOK in no time! After you have the high speed set let saw Idle, then accelerate quickly, if it bogs turn the "L"" clockwise little at a time reving it each time, till you get the bog worked, then when acceleration sounds quite responsive then go back to H speed and readjust it, open it up some and run it wide open and readadjust H speed to where it just drops off on rpms on the rich side not lean side, righty (leany)...Lefty Richy ! Good luck
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The idle adjustment screw on the carburetor usually has a spring on the shaft. Turn it counterclockwise to lower the idle speed. It probably won't shift because the gears are turning too fast...assuming that it's an automatic.
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.
Check there are no air leaks around where the air intake rubbers are at your carburetor. It sounds like your bike is running too lean or weak which means your air/fuel mixture is running on too much air and not enough fuel. This would explain it running smoothly when you put the choke on as the choke "chokes" the majority of the air from the carburetor and allows more fuel to flow through the carburetor creating a richer mixture. There will be a mixture screw somewhere on the carburetor which will allow you to either richen (more fuel and less air) or weaken (more air and less fuel) by turning the screw either in or out. Only adjust this by a small amount (about a quarter turn at most) at a time and try the bike to see how it rides each time. After adjusting the screw each time let the engine idle for about 30 seconds or so to let it settle to the new mixture setting before riding. There will be another screw on the carburetor which is your "idle" or "tick over"speed adjustment screw which adjusts how high your engine revs while the engine is "ticking over". Turn it in to increase idling speed and out to lower the idling speed. This will probably need adjusting as you change the fuel/air mixture. I hope this helps you and good luck :o)
There is an idle adjustment screw that adjusts the idle speed of the weed whacker on the carburetor.
Look for the throttle cable, and there should be a screw adjustment in the area where the throttle cable hooks to the carburetor. It will normally adjust with a screwdriver, turn the screw one way and see if it speeds up, if so then adjust the screw the other way to slow the idle speed down.
I hope this helps,
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Surging engines in lawn mowers are usually related to a lean fuel/air mixture. With today's environmental concerns, the carburetors on these engines are set with a very lean mixture (to reduce air pollution). Furthermore, they usually put limiter caps on the carburetors where you cannot easily adjust the mix to get the engine to run better.
If there are adjustment screws on the carburetor, try turning the high speed adjustment screw a bit counter-clockwise (if the limiter cap will allow it). This will enrich the fuel/air mix a bit and might help the engine run a bit better.
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