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Quick cut saw revving too hard

Quick cut saw trouble starting and revving at maximum with out throttle and will not stop without choking

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  • dontbother10
    dontbother10 May 11, 2010

    Good catch Jerry... I'm thinking stsrter recoil... Hard to find on an electric.

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 1 Answer

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!

Good luck!

Posted on Jan 12, 2009

  • 23 Answers

SOURCE: 4 y/o oulan chain saw hard to start and quit running, no spark.

TRY RUNNING AT HALF OR FULL WHEN IT DOES POSSLBY BAD GAS/MIX IF YOU CHANGED THAT ALREADY CARB PROBALY NEED TO BE CLEAN

Posted on May 17, 2009

  • 135 Answers

SOURCE: I have a Husqvarna 350 (1998). Just replaced

Kinda hard to hook up the throttle rod incorrectly. When you replaced the piston did you notice which way the arrow on the piston head pointed. It should point towards the exhaust. Also, you probably should have replaced the two crank seals just to be on the safe side. Sometimes, those little creatures can cause total agony and most guys do over look them.

Posted on Aug 02, 2009

dontbother10
  • 2220 Answers

SOURCE: When chain saw is starte it goes to full throttle.

You understand there is a fast idle start position? If your saw is new it is triggered when the choke is pulled and remians in this position (even when choke pushed in) until the throttle is advanced once. Read your warm start instructions, it says pull clutch, push clutch, start. This is why we should buy saws from a chainsaw seller/mechanic NOT Home Depot!!!
I made the mistake ONCE of attempting to start mine without the fast idle engaged... my shoulder aches just thinking about it. GL
Lou

Posted on Sep 14, 2009

rwvanlue
  • 486 Answers

SOURCE: Husqvarna chain saw Model 141 running at high rpm's

You may wnat to inspect the intake manifold/boot that mounts inbetween the cylinder and the carb. Also, the impulse tube that comes from the bottom of the cylinder to the carb manifold or carb itself. Sounds like you are running a lean condition. You need to locate the source very quickly, or continued operation will permantly damage the saw. I have listed a few other things to check.
Please let me know what you find. rwvanlue

Basics to check:
1) Spark plug - brown or dark brown - OK
a) is it carbon or fuel fouled (black and carbon deposits)
b) is there spark

2) Muffler remove for inspection
a) exhaust screen clean or plugged
b) inspect cylinder wall/piston as the flywheel is slowly rotated
3) Check cylinder compression

Fuel starvation - 'lean fuel' condition
Basic things to check:
1) spark plug
2) spark arrestor in muffler
3) fuel lines and tank filter
4) turn adjustment needles out (counterclockwise) 1/4 to 1/2 turn
Chain Saws:
5) check impulse tube and intake boot for cracks or leaks
*if all of the above are OK and/or do not improve performance then:
Remove Carburetor
6) replace gaskets/diaphragms
a) use a spray carb cleaner to clean jets, holes, and body of carb
b) fuel pump diaphragm goes against the carb body,
then the gasket towards the outside
c) metering gasket goes against the carb body,
and the diaphragm goes towards the outside

Posted on Nov 13, 2009

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1 Answer

Model 026. when trying to cold start, why does the compression button pop out without starting?


Its ment to.!!! that's the job of a decompression button.

Procedure:
1.push on off switch into full choke position, depress the decompression button.
2.pull the saw over until it 'fires' once.
3. the decompression button would have popped back up, click the on/off switch up to half choke.
4.pull saw over and it should fire up, revving.! blip the throttle to return it to tick over.

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I would take it back to the repair person you used and let them know that they fixed one problem and caused another.

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Choke trigger on the handle will not lock to start the chainsaw


more information please..

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.

Dec 31, 2012 | Stihl MS181 14" Chainsaw

1 Answer

How do you keep the blue choke to stay out


Hi,

The choke is designed to spring back in when the chainsaw operator depresses the throttle trigger for easier starting.

If the choke needs to be out for the saw to run you have a problem with the saw, make sure there is fuel in the saw, and the fuel filter is clean, if it fails to run still without the choke you may have a blockage in the carby stopping the fuel from flowing thru to the crankcase...

Brad

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1 Answer

I replaced fuel line from carb to intake and now it wont start?


Check the carb fuel stub to see if its seated in the hose. Chech to see if you re-installed the piston underside scavenge hose to the bottom stub of the carb. Check your compression. New is 160 psi, operational but problematic (hard start) 130~140 and completely toast at 90. This saw is easy to flood when compression has fallen off. Cold start, 3 pulls choke on with the throttle trigger locked wide open. At first sputter, put choke in normal run and it should fire by the 3rd pull. If not its flooded. Then remove the plug and with an air hose vacate the cylinder of fuel for a few minutes and try again without the choke or throttle lock set at wide open.

Good luck.

Nov 27, 2010 | Makita DPC7311 73cc 14Inch Gas Powered...

1 Answer

I have a poulan pro pp4620avhd chainsaw. I can get it to start and stay running as long as I have the choke on. I can even run it at high speed using the choke control. When I pull the trigger to feed it...


Check the fuel filter and muffler for plugging. Check the fuel lines for condition. Check the carburetor fasteners for tightness. If the saw has a lot of hours, remove the lower section of the carburetor and check the condition of the diaphragm--it should not be hard/cracked. If everything seems to check out ok, Turn both jet screws CW to stops (lightly), then CCW each 1-1/2 turns. The engine should start and run--allow the engine to warm up. Pull the throttle full on and adjust H needle CW til the engine speeds up, but still 4-strokes. Proper adjustment is when the engine 4-strokes, but immediately 2-strokes when cutting. Let idle and adjust L CW so that the engine runs fairly well, but allows the engine to 'follow the throttle'. Adjust the idle speed screw so that the chain stops turning, but the engine continues to run. Hope this helps!

May 11, 2010 | Poulan Pro Chain Saw 46cc 20"

1 Answer

I own a McCullogh 610 Pro mac chain saw. Why does


Check the muffler to make sure that the spark arrestor screen is not plugged. Make sure the air cleaner is clean and not plugged. Turn both L and H mixture screws CW to stops (lightly), then back out 1-1/2 turns each. Warm up the engine, then open the throttle and turn the H needle CW until the engine speeds up, but still '4-stroking' but should immediately start '2-stroking' with light cutting. Release the throttle and adjust the L needle CW for fairly smooth idle, yet rich enough to allow the engine to 'follow the throttle' immediately when accelerated. Adjust idle speed CW until the chain starts to turn, then back off until it quits turning. Make sure the chain is being properly oiled and is adjusted for no chain droop, yet turns freely by hand. Hope this helps!

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1 Answer

Gilera Runner very difficult to start cold,then cuts out when hot


to check the electric choke..take it/off out of carb & unplug it. then get 2 short lenghts of wires, strip both ends...shove one end into the choke plug teminals(one in each hole) .then put one of the striped ends of thewires on a charged battery(one on the positve & one on the negitvie terminals) .keep them on for about 5 mins & you should see the choke head extend (you could always mesure it befor you put to battery & check in 5mis to see if extened!!) this will tell you if its working!!...if its not working this will explane why you have trouble starting from cold!!..it also sounds like the main jet is blocked...this is found by taking of the float bowl (as you may know!)it will prob be the small hole up the middle of the jet that is made up with muck!!...try sticking a strand of a wire brush up/threw it...also it sounds like the exhaust is leaking round the maifold..will have to take exhaust of & check if it need a new gasket..or resealing!!(does the exhaust blow?. this is good way to tell if it is leaking(put a rag/palm of hand over end of exhaust & you should beable to hear it blowing. ...hope this helps....Howard

Dec 14, 2009 | 2005 Gilera Runner VX 125

2 Answers

When chain saw is starte it goes to full throttle.


You understand there is a fast idle start position? If your saw is new it is triggered when the choke is pulled and remians in this position (even when choke pushed in) until the throttle is advanced once. Read your warm start instructions, it says pull clutch, push clutch, start. This is why we should buy saws from a chainsaw seller/mechanic NOT Home Depot!!!
I made the mistake ONCE of attempting to start mine without the fast idle engaged... my shoulder aches just thinking about it. GL
Lou

Sep 13, 2009 | Husqvarna Garden

1 Answer

I have a Husqvarna 350 (1998). Just replaced cylinder and dismantled the saw for a complete wipe down. After reassembly, the saw runs great if I start with a squeezed throttle. Will not idle at all. Help!...


Kinda hard to hook up the throttle rod incorrectly. When you replaced the piston did you notice which way the arrow on the piston head pointed. It should point towards the exhaust. Also, you probably should have replaced the two crank seals just to be on the safe side. Sometimes, those little creatures can cause total agony and most guys do over look them.

Jul 05, 2009 | Husqvarna "Chain Saw - 16" Bar, 3 Hp

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