Question about Husqvarna Chain Saw 20" Bar
Starts with the choke and then when you take the choke off the engine rpm's go wide open. when you give it gas it runs until you let off trigger.
SOUNDS LIKE THROTTLE NEEDLE STUCK OPEN CHECK THROTTLE LINKAGE STICKING OR RETURN SPRING
Posted on May 24, 2009
I'm not sure I understand the problem description but it sounds like normal behavior to me.
The saws from Husqvarna, Jonsered, Partner I'm familiar with has the following starting procedure:
1) Switch on ignition and pull the choke fully
2) Pull the starter rope a few times until it "pops", i.e ignites
3) Push in the choke *fully*
4) Pull the starter a few more strokes until the engine starts - it will have approx half speed here since there is a throttle hook-up mechanism, chain will be running
5) Push the trigger briefly to rev it up to full speed then release - this will disengage the throttle hook-up and the engine idles, chain should stop. Now it is ready to use.
This is what it is designed to do. If it misbehaves then you must give some more information for me to help you.
Posted on May 24, 2009
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Posted on Jan 02, 2017
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Both the Hi and Lo screws are simply needle valves. By turning them you allow more or less fuel to flow past the needle. When you adjust them you are directly controlling how much fuel flows through the idle jet and the main jet.
is your car have a choke plate lever ( for warming up ) (like old fashion ) ?
When the engine is cold and you try to start it with the pull cord, the engine is running at an extremely low RPM. It is also cold, so it needs a very rich mixture to start. This is where the choke plate comes in. When activated, the choke plate completely covers the venturi to see it in action). If the throttle is wide open and the venturi is covered, the engine's vacuum draws a lot of fuel through the main jet and the idle jet (since the end of the carb's tube is completely covered, all of the engine's vacuum goes into pulling fuel through the jets). Usually this very rich mixture will allow the engine to fire once or twice, or to run very slowly. If you then open the choke plate the engine will start running normally.
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