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Mccolluch Mac 463 chainsaw runs erratically

My chainsaw won't run consistently. Sometimes it will start easily enough and will rev high until warmed up then will cut out with the choke off or if I try to use the throttle. Other times it takes a few good pulls to get running and will work ok. The one consistency is that with the chain brake off the chain will keep on rotating, not sure if this is how this chainsaw is supposed to operate as I bought it second hand without the manual. Any suggestions appreciated

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  • Master
  • 577 Answers

Clean carb and if that doesn't do it replace crank seals it's sucking air in the crank seals causing it to run lean and starv for fuel, also a good indication is does it rev high where you cant get it to idle down , then when you do it is erractic

Posted on Nov 29, 2012

  • kevhatch49
    kevhatch49 Dec 01, 2012

    OK .. I got it running semi normal, however, it would only run on half choke and with very high revs ... if I tried to use the throttle it would cut out. Shortly afterwards I noticed smoke coming from the chain cover. After letting it all cool down a further inspection showed that the chain brake had been in contact with the chain drive wheel getting hot and melted the plastic cover!!!!! Now I have completely removed the chain brake mechanism and it seems to be working ok, apart from it starting at high revs and dying down when I blip the throttle and the chain still rotating at speed when no throttle applied.

  • 2strokeJim
    2strokeJim Dec 01, 2012

    re-read my post clean your carb and put diaphrams in it w/ fresh fuel and fuel filter and go from there you obviousily have idle set way too high if chain is turning when idling, or your clutch is bad, the reason you have to have choke on half way is because it is not getting fuel, whether it is carb issue or crank seals !


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Posted on Jan 02, 2017

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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

  • 211 Answers

SOURCE: chainsaw cuts out a few seconds running

hi frado
check the fuel lines,make adjustment to the carb,set the T ,check the fuel filter.Inside the carb,at the fuel pump side there is a screen,carefully clean it.Hope theese help.

regards savumihai71

Posted on Dec 01, 2008

  • 239 Answers

SOURCE: runs for a few seconds then stops

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

Posted on Dec 31, 2008

  • 97 Answers

SOURCE: my husband is fixing his chainsaw. It has a choke

check ur governor spring or linkage---adjust air/ fuel mixture

Posted on Aug 07, 2009

  • 776 Answers

SOURCE: I have a poulan pro pp4620avhd chainsaw. I can get

The best thing you can do to these engines it take them completely apart - take piston out and everything. Believe it or not, my 12-year-old son was able to do it - very few parts in these little 2-stroke engines. He polished the carbon off of the piston with a drummel tool and cleaned everything with carb-cleaner. Put it back together and it ran like a champ. Still does. It was a great learning experience for him too. The worst that can happen is you have a bunch of parts that you will throw away.

Posted on Mar 19, 2010

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I was using my o17 saw today it was runing Just fine I shut it off when I went to start it again it fired on choke seting after that I could not get it to do anything what is wrong with it

All 2-strokes love to run rich when cold thus full choke till it kicks, half choke to start and leave on for 5 seconds high rev's to warm & lubricate, then no choke to run. Restart when hot is 1 pull full choke (you are now flooded) & then no choke til it starts. Try it. Works every time on all of my 2-stroke engines.

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I also have a stihl chainsaw model home light 240. I just had it sharpened and a new spark plug put in by the repair guy. I used it for 30 mins and it kept stopping until I couldn't start it again

Starting procedure for Stihl.
(cold starting)

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.

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remove the muffler and run it the mufflers plug up and restrick the exhaust some mufflers you can open and clean the screen

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Chainsaw won't stay running

You must have dirt in one or more of the carb jets. Remove the carb and clean it with carb cleaner spray and compressed air (compressed air is a must).

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42cc 18 inch craftsman chainsaw model 358-351910-18. Saw runs great at idle or while not cutting wood, when starting to cut wood just after the entire bar gets into the wood engine bogs down and chain...

Generally this is a fuel / air ratio problem. Usually it can be solved by a carb adjustment. On the carb there are usually two screws, one marked low or L , the other marked high or H. Low is your adjustment for idle mixture, high is for mixture at full throttle. The saw should Always be adjusted to run well during the cut. Make adjustments a little at a time, then try The saw. Continue small adjustments untill the saw is performing well at full throttle while Cutting.

Aug 09, 2011 | Poulan Pro Chain Saw 46cc 20"

1 Answer

I can start my chain saw but when I give it more gas it stalls.

Hi jbboitnott,

There are 3 things I can think of that would cause that problem. First, the saw was not warmed up enough. Second, did you cut the choke back after your saw warmed up? The third cause would be that your carburetor is not adjusted correctly.
If you did the first two things, then you could try adjusting your carburetor. The carb has to have a richer mixture when it's cold than when it has warmed up. If you have your carburetor set with the mixture too high, it would start but then choke on the extra gas when it was warmed up. Thus, you should lean out the carb.
Huskys carb adjustment screws are on the same side as the oil and gas fill caps. They are above the gas cap. The screw on the left is for leaning the carb, the one on the right is to richen the mixture.
So, turn the left screw, sometimes marked "L", counterclockwise to richen the carb. Adjust a very small amount at a time. Let it run a little, cut some wood, then adjust again, if need be.

I hope this helps. If it does, I'd appreciate your vote. Thanks for visiting

Handie Andie

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1 Answer

18"poulan chainsaw

Start at 1.5 CCW form lightly seated then tune for performance like this:
Carburetor Adjustment by
CW is leaner; to lean will destroy the saw. If over tightened closed (CW) the adjustment screw faces are easily marred; marred adjustments are difficult to impossible to set properly.
Clean the air filter; adjusting with a dirty filter can cause a run lean condition once cleaned and the saw run.

There are 2 wav (sound - idle & full – may not be highlighted) files that I find most helpful, I think you will too.

I think your starting procedure may be the cause of flooding. Flooded is the #1 cause of hard starts in 2-cycle engines. Read carefully the recommended start in your manual. most miss the second note. It should be similar to this (read 3, read it again):
Warm start in the manual says 1/2 choke BS. Close choke, (sets fast idle) open choke, pull rope.
Start Procedure
  1. Ignition on/off to on
  2. Set compression release – optional step even if saw is equipped with a compression release
  3. Pull (close) choke, set fast idle (done when choke closed on some saws); pull starter and listen for an attempt to start. once heard (usually two pulls; no more than 4).
  4. Set compression release – optional step even if saw is equipped with a compression release.
  5. Push (open) choke pull starter until it starts (usually first pull).
  1. Ignition on/off to on
  2. Set compression release – optional step even if saw is equipped with a compression release
  3. Pull (close) choke, set fast idle (done when choke closed on some saws) – Do not pull with choke closed.
  4. Push (open) choke, pull starter until it starts (usually first pull).
If you still have trouble reply as you did before. I will get back to you. HTH

Feb 18, 2010 | Poulan Garden

1 Answer

I have a homelite xl12 chainsaw it starts and runs fine untill it gets warm about 5/10 mins of run time.....then it dies or if it stays running no high revs cuts in and out.... also if you take gas cap off...

The engine is running hot. A build up of chain lube/saw dust/dirt is likely blocking cooling air to the cylinder cooling fins (and gas line and carb) causing the fuel to boil (vapor lock)
Compressed air, played around openings in the shroud, will sometimes remove enough of the obstruction to help and is worth a try. Best solution is to split and remove the case/cover, after which, the engine and shroud can be throughly cleaned. Be sure to stuff a clean rag in the carburater throat to keep debris out.

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