Took carb all apart soaked it in a cleaner for a day blew it out with air- put it back togeather. New fuel line and filter. Saw started after 2 pulls but wont idle - no matter what i do with the low speed adj.or throttle adj. It revs up on high speed no problem-but cant idle....any ideas? tks...
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If the plug is soaked, then the needle in the carb is most probably leaking, you need to do a pressure test on the carb to prove this, if you do not have a pressure tester it will be a case of replacing the needle and hope for the best, make sure the gasket goes on before the diaphram, it acts as a spacer.
First I would start with the fuel filter, was that replaced too?, then I would make sure you have fresh gas and a new spark plug, Probably what I would suggest next is to pull your carb off and take apart and clean it with carb cleaner, most likely you will find dirt and possible small fragments from rotten fuel lines,partially plugging the inlet screen in carb, also your diaphram could be stretched, wouldn't hurt to pur carb kit in it while it is apart, I have just cleaned them before and been o.k. this should help you out
Operate the throttle trigger to see if it returns to the idle speed screw when the trigger is released. If it seems to 'float' somewhat, the trigger assembly may be full of dirt/sawdust, or the throttle return spring on the carburetor is damaged or disconnected. When taking the trigger assembly apart, be sure to make notes so that it can be put back together correctly. Make sure the throttle plate in the bore is tight to the shaft. When the carburetor was off of the engine, did the gaskets and heat insulator seem to be ok? Any air leak behind the carburetor will cause run-away speed. As for the engine quitting, check the fuel filter, air cleaner, and muffler for plugging. Check the condition of all of the fuel lines for decay or other damage. Did you check the condition of the diaphragm in the lower chamber of the carburetor--it should be quite flexible with no holes or cracks. With the jetting set where you have it, the engine should be 4-stroking heavily. Hope this helps!
if you have a good compression,a strong enough blue spark and carburetion for the fuel air mixture try priming the engine(put small amount of gas in the spark plug hole)then start the engine.If the engine runs only the gas you put inside the cilinder there is a carburetion problem to find and fix.
let me know regards savumihai71
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
Check the fuel filter, air cleaner and muffler for plugging. Was the carburetor disassembled when soaked and did you use compressed air to blow out all passages? If the carburetor jet screws have been moved, preset them as follows: Turn both H and L screws CW to stops (lightly), then back out CCW each screw 1-1/2 turns. Start the engine and allow to warm up. Pull the throttle full on and adjust H CW until the engine speeds up somewhat but 4-stroking. Proper adjustment is when the engine 4-strokes, but immediately 2-strokes when cutting. Allow to idle and adjust L CW until the engine runs fairly well, but still allows the engine to 'follow the throttle'. Adjust idle speed screw so that chain stops turning, but the engine continues to run. Hope this helps!
Recheck that carburetor was assembled correctly and that fuel lines, including the one in the fuel tank, are in good condition. Preset the H & L needles at 1-1/2 to 2 turns from stops. Check for good spark on the spark plug. Check air cleaner and pull muffler apart to check for plugging. If will start and run, set H needle so that engine 4-strokes at speed, but smooths out when cutting wood. Set L needle so that engine idles fairly smooth, but allows engine to accelerate rapidly with throttle. Idle speed adjusted to keep engine running, but chain stopped.
after jerkin fingers bloody today same problem i took carb apart,,the old hoses deteorated an clogged screen on in take side/// inside of carb plate //of carb,,blew out with choke cleaner,, reassembled now runs well make sure to run same size hoses large an small,,as original other wise floods out,,,