Question about Husqvarna Chain Saw 20" Bar

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Runs for a few seconds then stops

Spear and jackson chainsaw. needs choke to run. starts then wont rev, just stalls. re-prime and start with choke then stops. plug is ok, fresh fuel.

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  • Heath Capps
    Heath Capps Jan 26, 2014

    yes fresh fuel and plug is new it will idle all day with the choke ingauged idle but pull the triger on the throdle and it dies

  • Anonymous Mar 30, 2014

    What can I try next?

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There are two screws on the carburator one is for air other for gas .that need ajusment

Posted on Dec 31, 2008

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From your description, it sounds like your carb is running too lean. Make sure the spark arrestor screen is free of carbon build-up and the air filter is in place. Warm the saw up. With the saw at idle, adjust the Low adjustment screw to slightly enrich the mixture. If you turn it to run the fastest possible when idling, it is too lean. When the Low setting is right, you will be able to increase the RPM without it dying. If the High setting is way too lean, it may also die when you open up the throttle. If you run the saw too lean, it willl overheat and sieze.

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Spear and jackson chainsaw. runs for a few seconds then stops. needs choke all the time. primer bubble seems to **** back fuel when priming. fuel is clean. saw is 1 month old. plug is fine. saw will not...


OK - let's work through this. If you need choke all the time then the mixture is too weak when the choke is off. Putting the choke on literally chokes off the air supply to the engine by lowering a small shutter across the entrance to the carburettor. That means either there is too much air getting to the engine (don't see how!!) or too little fuel. So, how do we get too little fuel? You could check for this as follows;
- before we do anything tricky let's check the obvious things - is there a fresh fuel mix in the tank? Petrol does go off, especially if there is 2 -stroke oil added to it. If it's over a month old from the pump mix up a fresh batch. Is the idle speed set too low so the engine stalls when the choke is knocked off? You can see this screw to one side of the carburettor (you need to remove the top lid in front of the handle on the chain saw, and then remove the air filter to see it). Turn the screw half a turn clockwise to speed the engine up. Be warned - if the engine starts it will run faster than normal and that means the chain may start to spin around. Also - check that the chain brake is off (i.e. the safety lever is pulled backwards, and that the chain is free to move BEFORE you attempt to start)
- is the fuel filter blocked? To get to this, make a wire hook (e.g. thick fuse wire) and gently hook out the fuel filter that's sitting at the bottom of the fuel tank, and take a look at it (be gentle - you can damage the gauze if you are clumsy). Does the gauze look clear? I.e. if you dip it into petrol it will freely run into the filter and of course drain out when you lift it? If not, replace it.
- next stop - are the jets in the carburettor set right? I don't have a service manual for this (and I know the manual says unhelpfully "return for service") but basically you will have seen two holes on the side of the chain saw (below the handle) two small 0.8cm holes; one marked 'L' (for low speed) and the other 'H' (for high). Put a fine flat screwdriver down the L hole and feel for the slot of the low speed jet. Once engaged turn it out half a turn and this will enrich the mixture - if this seems to help and you can start the engine then adjust the L jet in or out until the engine is idling comfortably. If it idles too quickly then you can also turn down the idle screw (see previous paragraph).
- no luck still? Well, it could be fuel pump or a blocked jet in the carburettor but this really is a 'return to the service centre' task!

Good luck!

Dec 30, 2008 | Husqvarna Chain Saw 20" Bar

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