Question about Garden
After running through a tank of fuel my chainsaw starts and then stops after 1-2 seconds. The fuel is fresh but the saw is slightly warmed up from recent use. What are the likely reasons for this problem?
Posted by Anonymous on
Once the saw cools down will it restart and run fine? There are a couple other solutions that are not directly due to carburation. The first two solutions above are definitely your first options.
1. Ignition Coil: Highly unlikely, but possible. I seen some where they get hot and run fine while cutting, you shut it down for a few minutes for whatever reason and it won't restart or starts and stalls.
2. Crankcase Air Leak: We started to see more and more of these issues. There are a couple of quick ways to test this if you do not want to pay a shop to do an actual test. You want to do a cold test and a hot test. With a half tank of fuel, start the saw up for the first time of the day. While the saw is idling, turn the saw sideways from right to left, do this slowly, listen to the saw idle, if the speed changes by increasing or almost stalling, you have a crankcase air leak. Most bad air leaks won't be noticeable until the saw has gotten hot and the aluminum crankcase starts to expand a bit. Do the same thing once the saw has gotten hot. If this happens when it's hot, chances are that it won't start or starts and stalls until it cools down and everything retracts.
Sporadic idling when cold: Most likely just the oil seals, fairly inexpensive repair.
Sporadic idling when hot: Most likely crankcase itself is leaking, requires a complete crankcase gasket replacement. Can be fairly expensive to repair.
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Posted on Jan 02, 2017
Just follow the fuel hose from the carburator and see where it is entering in the fuel tank.Fill out the gas from the fuel tank.At the end of the fuel hose is the fuel filter.Take them out (hose filter and fuel filter),then change it.Disassembly the carb and carefully cllean the inner parts.
:-* best wishes savumihai71
Posted on Dec 04, 2008
SOURCE: spear and jackson chainsaw. runs
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!
Posted on Jan 12, 2009
two things could be happening.......first is vapor lock......make sure you breather tube is clear and working........next is ....it could have a bad ignition coil on it.....after the coil gets hot the spark can become irratic or just not work any more.....
Posted on Feb 23, 2009
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