Search --workshop manual for Walbro carburetors
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search --workshop manual for Zama Carburetors
down load the pdf version
the high speed needle is set first ( one closest to the air filter) to obtain smooth high rpm running then the idle needle ( next to the engine ) is adjusted as you slowly slow down the rpm
final idle speed is achieved by adjusting the throttle screw and should be just slow enough that the centrifugal clutch is not engaged
SOURCE: Starts fine, but will not accelerate: Homelite UT-10798R
Do you have the H and L adjuster screws on the carb? If so, then normally I'd back out a little bit on the L (low speed side of carb) The instructions for adjusting carbs, years ago, on 2-stroke, say to back out on the L when motor will not rapidly rev up. Most 2-stroke carbs have these 2-jets. The L is for gas to pass to motor with butterfly throttle plate closed. When opening throttle plate, there is a sudden rush of air, at first, and this L adjustment is allowing enough gas to pass for motor to begin to rev. up. Then the gas will also flow through another small port H, usually a small brass tube in the venture area (smallest diameter section of carb). You adjust the H with the throttle wide open, motor revved up. Turn either in or out slightly till highest RPMS reached, motor smooth and fast, then turn H out about 1/4 turn. The idea is to run motor slightly rich for highest HP when under load (cutting). Hope this helps
SOURCE: difficulty adjusting carb for smooth idle and full power tilling
Your quickest fix for this problem is to simply replace the carburetor, a Zama K54A. Do it all the time. After that, if you can find a 2 cycle oil, Opti-2, it's the best you can use and it's a one mix for all your 2 cycle equipment (blowers, trimmers, chainsaws, etc.) It's the only 2 cycle I sell in my shop.
SOURCE: 2004 sportsman 600, bogs down bad at half throttle.
Check that your choke is working correctly
Your timing may be way off as well
SOURCE: My srm 230 starts but bogs down when you pull
Same issue with mine... I've put in new plug, fuel filter, made sure exhaust was clear. Changed gas.
SOURCE: My poulan wild thing 2375 bogs out when throttle
ok good place to start is close both hi low screws the open as follows low 1 an 1/4 turn hi 1 an 1/2 turn start saw when you pull throttle it should rev quickly with no hesitation if not gradually adjust in until this is achieved then hold wide open saw should run with slight gurgle at top end NOT scream out of control to much blubber and no power to much scream no power and catastrophic engine failure is a real possiblity
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