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Re: it starts up, but when trigger is pulled, the
Most saws have a safety or anti kickback brake. Yours might have tripped. There is a guard in front of where your left hand holds the saw. With the saw NOT running, pull the guard HARD towards the back of the saw. It should move a bit ant you may hear a click. The chain should now move. If the chain moves easily when the saw is not running, but doesn't move when you rev the saw up, the clutch is broken.
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https://www.stihlusa.com/.../instructionmanuals/stihl-ms-290-310-390-owners-instructio... Instruction Manual - improper use can cause serious or fatal injury. MS 290. Warning! ..... model. Safe use of a chainsaw involves. 1. the operator. 2. the saw.
Some saws have a throttle lock that locks the trigger to aid starting. Get a look at the carb to see if it opens when the trigger is pressed and closes when the trigger is released. If it stays open the lock may not be releasing or the throttle linkage is bound up or disconnected from the carb.
I'm guessing from the statement that it "will not work to increase speed" that you have been able to successfully start the chainsaw.
I have to look at this with the assumption that you haven't run a chain saw before, so bear with me if some of this is excessively simple.
If the throttle trigger does not move, something is jammed. The handle for the choke should automatically move to the retracted position when you pull on the throttle. If it doesn't, see if the trigger will move after you push the choke handle back in.
If the trigger moves in when you squeeze it but you don't hear any change in the engine sound then it's probable that the throttle wire has disconnected at the carburetor or at the handle.
Is the chain brake off? You need to pull it firmly back toward the upper handle for it to be disengaged. If the handle is forward it will lock the outer portion of the clutch. If you try to accelerate with it locked the engine will bog and not allow the chain to move.
Any of these conditions other than the chain brake will probably require some disassembly. Make sure you're confident that you've correctly reassembled everything if you're going to do it yourself.
To lock the choke on:- 1. depress dead mans trigget on top of back handle 2. squeeze throttle trigger fully in. 3. slide on switch fully down to 'full choke' position. 'it should stay there'. 4. Pull saw over until it fires once. 5. click 'on' switch up one position to 'half choke' 6. pull saw over again, saw should start running and be revving high. 7. 'blip' throttle, saw should stop revving and run on tick over.
Place saw on floor (flat clear surface). Make sure chain break is on. Hold throttle in, while pushing on switch all the way down. Place right foot in the flat of the rear handle. Place left hand on top handle. Pull starter handle until saw fires, it should then cut out. Click the starter switch up 1 click to half choke. Pull starter handle again untilsawfires up. note: it will be reving because the trigger is loched on, (blip the throttle once) and it should go to tick over.
There should be np need to keep playing with the choke when the saw is warm. No need to lock the trigger when starting warm.
Warm starting is performed by holding the rear handle between the thighs rather than on the floor.
The start procedure is done on one red lever, as you say prime till the bulb is 3/4 full, push deco vave in, pull the red lever out against the spring and right up, this engages choke and part throttle, pull until it fires once, push red lever down to dissengae choke, then pull again until it starts, flick the throttle trigger to release the part throttle and bring the engine to idle,if all is correct it should start within three to four pulls, if not it needs tuning on the carb screws.
There are two types of choke systems, the basic choke has a ball and spring in the carb body which locks the choke either in or out, the other type is connected to the half throttle position, once pulled out it stays out, however if you lift the throttle trigger it will go back in on its own, queation, are you holding the throttle trigger whilst trying to start it, if so this is why it will not stay out, if this is not the case, pull the choke out with a little more force, it may be just not coming out enought to lock.
Genral starting procedure on a chain saw is as follows, put fresh fuel into the fuel tank, top up the chain oil tank,switch the ignition on, if the saw has a half throttle position on the trigger lock this, if the saw has a primer depress this as many times as it takes to 3/4 fill the bulb, pull the choke fully out, if it has a deco valve push this in, now place the saw on the ground with the chain brake on and crank the engine ( always have the saw body between you and the cutter bar,NO left hand starting, NO drop starting ) the engine will only fire once on full choke, do not continue to crank engine after the first fire or you will flood the engine, push the choke back in, crank the engine until it fires up and runs,release the chain brake and blip the throttle to release the half throttle device.
First the chain should be tightened properly before starting. When you pick up on the chain midway of the bar it should pull away from the bar about 1/4". The proper mix of oil & gas in the fuel tank & Oil for the chain in the oiler tankk is needed, If so, locate the on/off switch & turn it to "on". Pull the choke lever out. Depress the throttle trigger & engage the latch for the trigger. With the saw held firmly in place, pull the starter rope until the engine hits. Then move the choke to half & pull till it cranks. move the choke lever to the run position.