Husqvarna 562 XP

[HiTech]

Has anyone had trouble with this saw restarting after it has been run awhile and warmed up? I did the running it for so many minutes at a certain RPM to set the Auto Tune. Still after you run it for awhile and shut it off and leave it sit for a few minutes it may not start again. My other Husqvarna saws start on the first pull after they run then sit for awhile. The saw really cuts if you can get it running. Love the way it handles. Starts good cold, just not hot or warmed up. 

[sharkey]

From what Im hearing you have 2 options.  You can take it back in and have the computer re-flashed or you can set up a large log and keep the engine under load at full throttle for 5 min to recalibrate.  Its alot of cookies unless you have a big stick! 

[OAP]

For hot starts pull out choke then push it back in this sets fast idle, then push in decompression valve, leave the throttle alone and pull the start cord.
This works on the new auto tune saws its just a matter of getting used to it.

[HolmenTree]

My new last fall 562 gave me a little trouble restarting when left sitting for 5-10 minutes after warmed up, even after doing the initial 5 minute break in as the manual says. Had to hold the throttle wide open and drop start it, but only did that a few times on the 2nd or 3rd tank. Has run perfect since, it can sit a long time after warmed up and start without the choke. Now I still haven't mastered the primer bulb yet, is there a special procedure for its use? I can only see it being useful when the saw has been sitting for a few weeks or after running the tank dry.

You don't have to cut cookies to do the 5 minute run up. I just put a 2 ft long block on end and rip with the grain multiple cuts a 1/2 inch apart for 3- 5 minutes. 

[HiTech]

Thanks guys, perhaps i haven't run it enough yet. Still fairly new. Only about a gallon and a half of gas through it. I took it back to the dealer I bought it from and he seemed clueless about it. Sooo many want to sell but not service.

[HolmenTree]

The idea with this micro processor AutoTune in my opinion is it's designed to bring the servicing business back to the dealer who sold it, just like what the auto industry did with their computerized controls.
But the dealer has to realize that he has to purchase the required software and learn how to use this technology.

[sablatnic]

You might have a leaking needle valve. All the computer and injection stuff doesn't make the saw immune to an old-fashioned defect.

About the primer bulb on chainsaws: It doesn't inject any fuel into the engine. It just flushes the carburettor with fresh fuel, the excess fuel running back to the tank. You can't flood the engine by pumping too many strokes.

[ehp]

OK in most cases the saw is heat soaked so its hot so its told to run rich to help cool the motor , in this case just hold the throttle wide open when trying to start it , you will find it starts alot better in those hard to start times, I know my 562's all do this off and on and I just hold open and crank and they start

[Corley5]

So do you guys with these saws like them better than the old fashion models  ???  I'm interested ;) ;D

[HolmenTree]

It was 90F with lots of humidity for the last couple of days and my 562 acted up a few times while dissecting some big maples and poplars. A little hard starting after shut down a few times but nothing serious.

For the amount of good care free performance the AutoTune technology delivers through out the different seasons of the year, far out weigh any hiccups it might have.
But I can see the technology improving in the near future. This improvement won't mean major changes in the saw's design......just a simple soft ware programming modification.

[HolmenTree]

I had the 562 up in a big spruce today doing a spar pole removal blocking it down [338XPT Husky and Silky handsaw removed the limbs].
The little bugger 562 was starting only on the 2nd pull half of the time when fully warmed up... a real PITA. It was still close to 90 with lots of humidity.
I guess I'll have to take it into the "servicing dealer" to get it tuned up :laugh:

[MidWestTree]

I keep reading these posts on the 562's hard re-starting issues, is there some line in the sand where Husky has gotten this figured out and made changes on newer product or are they still using the backs and wallets of their customers for Guinea pigs? 

I desperately need to replace two tired 60cc class saws with new ones and just can't bring myself to buy another one of Husqvarna's products that's in the field and failing prematurely or just wasn't tested enough before being released.

But I really need to buy saws again and it isn't going to wait another 90 days. Not sure what to do at this point but maybe look at another manufacturer.

[HolmenTree]

I haven't taken my 562 to the dealer yet, I come to realize they don't seem to like hot weather. Hard starting again today a few times after warmed up.

[MidWestTree]

I haven't taken my 562 to the dealer yet, I come to realize they don't seem to like hot weather. Hard starting again today a few times after warmed up.

Question for you if I may, are you finding the warm / hot re-start issue to be just a minor inconvenience requiring an extra couple pulls on the starter handle or is it costing you real lost time on a job for ten, fifteen or more minutes? Everyone seems to agree that their hands on experience with the performance of the 562xp is in a class all by itself compared to other 60cc class pro saw offerings currently available.

[HolmenTree]

Drop starting a saw with the right hand holding the throttle wide open and the left hand pulling on the rope is not my favorite way to start a saw, especially when you have to pull it multiple times to get it going, and its already warmed up .
Last saw I had to do this to was back in the 1970s with a Jonsered 621.
When weather temperatures are cool like in the spring or fall the 562 runs fine.
The 550XP seems to have the same issue.

[HiTech]

I haven't taken my 562 to the dealer yet, I come to realize they don't seem to like hot weather. Hard starting again today a few times after warmed up.

Question for you if I may, are you finding the warm / hot re-start issue to be just a minor inconvenience requiring an extra couple pulls on the starter handle or is it costing you real lost time on a job for ten, fifteen or more minutes? Everyone seems to agree that their hands on experience with the performance of the 562xp is in a class all by itself compared to other 60cc class pro saw offerings currently available.

From my experience with the hot start on the 562XP is it either starts on the first or second pull or you could be in for a session. A couple times I had to pull the plug to dry it off and no the saw wasn't choked, just set at high idle. If you start it cold and cut all day with it it is one awesome cutting saw. Can't believe the power it has...just don't shut it off. lol I think sometimes modern technology is better left in the labs...auto tune carbs. I would imagine one could get an aftermarket carb and solve the problem but why should you have to do that? I can't believe they didn't see this problem if they test ran these saws before letting the public have them.

[HolmenTree]

The way I see it these saws were designed for 8 hour a day production work at a logging site in the forest. Myself doing arborist work where it's stop and go cutting in a warmer weather urban environment.
I hope they get the T540XP  arborist auto tune saw right.......a lot of stop and go in aerial tree work.

[John Mc]

The description of it running fine if you keep it running, but having troubles if you run it hard in hot weather makes me wonder if it's getting vapor locked ??  If this is the case, keeping some fuel moving through the system might help prevent the vapor lock -- it may be when it sits still that some of the fuel in hotter spots boils, causing fuel flow issues when you try to restart.

Does letting the saw idle for a couple of minutes before shutting down help the restart issues at all?  This may let some of the hotter spots cool down a bit from where they'd be running under load at WOT, but still keep the fuel flowing a bit while it's doing so.

[HolmenTree]

Not very practical John ,letting it idle for a few minutes before turning it off while busy doing treework.
But you may have a good point, I'll try it tomorrow, but having said that it has been cooler weather lately and the 562 is running fine. :D
This auto tune with a carb is the problem in my view. The future is going to see hand held gas powered tools with fuel injection............
Take for example Stihl's TS 500i Cutquick saw with computer mapped fuel injection, which they claim continuously and precisely determines fuel mixture, injected quanity and ignition timing. These Cutquick saws work in the harshest environment cutting concrete in the hottest of weather. Just a matter of time Stihl will have their pro chain saws with this setup.
I'm quite sure Husqvarna has their eye on this technology. ;)..........or do they ???

[John Mc]

Not very practical John ,letting it idle for a few minutes before turning it off while busy doing treework.
But you may have a good point, I'll try it tomorrow, but having said that it has been cooler weather lately and the 562 is running fine. :D

I had forgotten you're doing arborist work. I agree it's not practical.  Still, might be interesting to help diagnose the problem when on the ground.

I had another thought:  I'm not all that clear on how the auto-tune works, but is the autotune just tuning for conditions created when the saw is very hot, then remembering that setting when you try to restart? 

I may be pushing the comparison a bit, but I fly a Cessna 172 with an air-cooled piston engine.  The mixture control is manual on these, so it's something I do have to fiddle with mixture regularly to compensate for altitude, temperature, etc. (not to mention the FAA grills you on this stuff in written and oral tests when you go for your pilot's license). Hotter air is less dense, so a hot day (or turning on the carb heat) puts less air through the carb making the engine run a bit richer.  You compensate by leaning a bit.  If i shut off at that setting, the engine is harder to restart.  Is the autotune remembering the "hot condition setting when you restart, or does it "know" you are starting, and richen the mixture accordingly?

[MidWestTree]

John your on the right track with the AT system and it's ability to sense "heat" and ambient air conditions. This feature is supposed to richen up your mixture and prevent a lean out condition automatically, subsequent scoring and destruction of the P&C should never happen due to hot and or lean conditions if it does it's job.

There's the problem with a warm restart on these, the saw is shut off with a hot cylinder. The AT system senses the heat and accordingly (I am assuming based on the numerous user complaints) gets the mixture a bit to rich to start it. As some users have advised blipping the throttle open with one hand and pulling with the other this would make sense to overcome the AT's design flaw.

Bottom line, just about all of us have to start and stop saws numerous times for a variety of reasons in the course of any day. This Auto Tune technology is ridiculous at this stage of it's offering and I wish I could go back ten years and stock up on saws that did the job we paid the price to these manufacturers for.

I'm sick and tired of seeing working guys pay the price for pro saws and get used for manufacturers R&D in the field while they try to make a living.

[HolmenTree]

Not very practical John ,letting it idle for a few minutes before turning it off while busy doing treework.
But you may have a good point, I'll try it tomorrow, but having said that it has been cooler weather lately and the 562 is running fine. :D

I had another thought:  I'm not all that clear on how the auto-tune works, but is the autotune just tuning for conditions created when the saw is very hot, then remembering that setting when you try to restart? 

I may be pushing the comparison a bit, but I fly a Cessna 172 with an air-cooled piston engine.  The mixture control is manual on these, so it's something I do have to fiddle with mixture regularly to compensate for altitude, temperature, etc. (not to mention the FAA grills you on this stuff in written and oral tests when you go for your pilot's license). Hotter air is less dense, so a hot day (or turning on the carb heat) puts less air through the carb making the engine run a bit richer.  You compensate by leaning a bit.  If i shut off at that setting, the engine is harder to restart.  Is the autotune remembering the "hot condition setting when you restart, or does it "know" you are starting, and richen the mixture accordingly?

Good post John!
I'm no expert on this technology let alone computers and their software. But when treework slows down this winter I will have time to learn how to use the Husqvarna AutoTune software kit that I'm buying from a friend.
I'm sure someone here can better explain how this micro processor controlled carb works.

All I can say is last February when it was -20F below I had 3 brand new never started 550XPs that sat for a week in my unheated garage. When I went to start these saws I had to pull the rope on each one a couple hundred times before they were able to idle on their own. The choke seemed to do nothing and I guess the friction of the piston in the cylinder while pulling the rope that long , was enough to warm it up a little to get the micro processor to release some fuel. :D
The way I see it the saws "memory" was room temperature at the factory in Sweden when they had their initial run in. I should have warmed them up to room temperature before fueling them up and trying to start them.
 

[John Mc]

I've heard the autotune saws need a run in when brand new to get their initial settings dialed in by the autotune software.  Is this correct?

[HolmenTree]

I've heard the autotune saws need a run in when brand new to get their initial settings dialed in by the autotune software.  Is this correct?

Yes that is correct, 5 minutes WOT cutting steady in a log. Don't cut cookies unless you have a log big enough to bury the bar. What I do is stand a 2 foot long block on end and rip cut down into it for as many cuts I can within 5 minutes.
I believe this should be done during change of seasons too.

[HiTech]

On my older Husqvarna saws I just pull them once when hot and they are running. No auto tune on them. Technology!? Good/Bad?? It's very aggravating pulling that rip cord many times to get a saw started. I am going to look for a replacement carb.