I haven't used my chainsaw in 5 years and when tried starting, it wouldn't. I began adjusting the 2 mixture screws and believe they are now too rich or too lean because the saw will not start.What is the static setting for the top and bottom mixtures adjustment screws?All the way in then 1/3 turn out?Thx, D2
BEFORE YOU DO ANYTHING, CHECK THE CARBURETOR AND FUEL LINE FOR GUMMY DEPOSITS. TODAY'S GASOLINES DEGENERATE AFTER STANDING FOR LONG PERIODS. IN THE FUTURE, WHEN YOU ARE DONE WITH THE CHAIN SAW, EMPTY THE GAS OUT AND RUN THE SAW TIL THE CARB IS FREE OF RESIDUAL GAS.
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Homelite XL 2 Automatic Chainsaw ... free to shoot me a question or comment and I'll do my best to answer as accurately as I can . ... Homelite SUPER 2 Chainsaw OILER REPAIR & TEST RUN - Duration: ... HOW TO ADJUST A Homelite Carburetor - Duration: 5:01. by smallenginemaster1 177,482 views.
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Several reasons for that,
1. Air is getting into saw through leak in manifold
2. Carb idle/rev screw is set too high
3. Carb idle mixture screw is set too weak (uscrew it a tiny bit and check) See my other answer link below for advice on that:
4. Fuel filter in tank is partly blocked reducing fuel flow. They should be changed once a year on a domestic saw, more often on a professional saw.
5. The springs on the clutch are weak allowing it to engage at too low a speed.
Carburetor adjustment for efco 152 chainsaw
gently run the fuel and air mixture screws on the carburetor all the way closed (clockwise).then turn them out one and a quarter turns each. That setting should allow the saw to start if you are getting fuel to the carburetor. Once the saw starts, make fine adjustments to the fuel/air mixture screws until the saw runs to your satisfaction.
I would first clean the saw... especially the chain drive area (remove the cover first and use compressed air if you have a compressor). Check the drive sprocket for excessive wear. Check the power cord for any damage. pull up on the chain at the middle of the bar to ensure the chain is not too loose or too tight (the chain should be able to be pulled up one eighth of an inch... no more. None of the dogs at the inside of the chain should come completely out of the slot in the bar. If the chain is too loose, adjust it by reinstalling the cover, ( When you put the cover on, make sure that the small nib on the chain tensioner fits in the small hole in the bar). loosen the two chain bar retention nuts and adjust the screw at the front of the main body next to the bar. When the adjustment is correct, tighten the chain bar retention nuts and check the chain tension again. If you have a chain sharpener, now would be a dandy time to sharpen your chain.
Sounds loike its running lean, start by replacing the fuel filter on the end of the pipe in the fuel tank, if this does not help you need to richen up the mixture screws, unfortunayly you need a special toll to adjust the screws ( they have a spline, not a screwdriver slot ) the tool is part no. 530035560, once you have the tool unscrew the carb screws 1/2 turn on each and try again.
Check the air cleaner and muffler for plugging. One screw adjusts the idle stop (idle speed) position and the H and L jet screws set fuel mixture for high speed and idle speed mixture respectively. Turn both jet screws CW to stops (lightly) then back each out CCW 1-1/2 turns. This is a basic setting and should allow the engine to start and run. Start the engine and allow to warm up. Pull the throttle full on and adjust H CW until the engine starts to speed up, but 4-strokes. Correct adjustment is when the engine 4--strokes running free, but immediately 2-strokes when cutting. Release the throttle and adjust L needle CW until the engine idles fairly well, but allows the engine to 'follow the throttle'. Adjust the idle speed screw so that the chain stops turning, but the engine will continue to run. Hope this helps!
Most carburetors can be rebuilt and solve most problems, but occasionally the debris is into places where cleaning is not possible, and must be replaced. I would try some basics first though.
Overfuel or 'rich' condition Basics to check:
1) Spark plug - brown or dark brown - OK a) is it carbon or fuel fouled b) is there spark
2) Muffler remove for inspection a) exhaust screen clean or plugged b) inspect cylinder wall/piston as the flywheel is slowly rotated
3) Check Air filter for fuel saturation
4) Allow engine to run for 5 minutes to excess fuel from muffler
5) Fuel mixture ratio: Make sure the oil mix is per your manufactures recommendations
6) If after the above the engine is still smoking and blubbering: Adjust carb mixture screws to a 'less rich' setting *NOTE: only move mixture screws 1/8 of a turn at a time, and try operation before any more adjustment
disassembly the carb and carefully clean it.Check the air filter,the fuel line and fuel filter,check the needle,lever,small spring and the screen filter from the carb.Check the sparkplug.
high speed H=2 turns,low speed L=2 1/2 turns,adjust T
When chain saw starts adjust H,L and T accordingly.