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Posted on Jan 02, 2017
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
Posted on Nov 19, 2008
SOURCE: bogging down
The 2 stroke engines,your chain saw as well need to be check every year due to the carbon deposit from burning gases.Check if the engine is sealed properly(gaskets from carb,cilinder,crankcase and the seals.Pay attention at the flyweel key(not to be sheared off)crankshaft,piston,piston rings,piston rod.
Posted on Dec 06, 2008
Since you don't indicate the make and model, I can't give you specifics, but when I had this problem it turned out to be a dirty carb. This can cause uneven fuel flow and loss of power. At full throttle, you may not be getting sufficient fuel to work properly. Try cleaning the carb a nd update this with the results.
Posted on Jan 30, 2010
SOURCE: poulan saw wont run
Clean the muffler spark arrestor screen and check the cylinder port for carbon build-up at the upper edge. Try presetting both carburetor H and L adjustments (from lightly CW stops) 1-1/2 turns CCW each. Start the engine and allow to warm up. Pull the throttle wide open and adjust H CW until the engine speed increases, but still 4-stroking. Correct setting is when the engine 4-strokes, but immediately 2-strokes when cutting. Allow to idle and adjust L for smoother running, yet allows the engine to 'follow the throttle'. Set idle speed to keep the engine running, but doesn't try to move the chain. You may have to look closer at your carburetor if the above doesn't help. Go to:
for an excellent article (but poor pix) on Walbro carburetors, but related to most all 2-stroke carburetors. Hope this helps!
Posted on Feb 24, 2010
I think your on the right track
Blowing compressed air through your tank vent
is great but it is way more air than the natural asperation
that the saw pulls on it own
I would replace the vent cap and also look for a pinched fuel line between the fuel tank and the carb
Posted on Apr 07, 2010
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