Author Topic: 562XP / 555  (Read 5386 times)

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Offline 2spud

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Re: 562XP / 555
« Reply #20 on: April 02, 2012, 02:30:57 pm »
In the systems I'm familiar with... which I admit *isn't chainsaws*.... measuring true fuel flow entails sophisticated electronic$.
For conversation sake, let's say the mixture adjusting is via a stepper motor. If so, the software would have a "first start" (or whatevfer you want to call it) initialize routine that finds the low limit ('0') and high limit ('100'). Thereafter you would measure digital pulses (count) required to keep within the feedback loop.

Offline mweba

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Re: 562XP / 555
« Reply #21 on: April 02, 2012, 02:51:44 pm »
The inputs are throttle position, carb temp and rpm.  I'm sure it has a set/default parameter that it plays off.  It seems to me, the issues for the most part are carb flaws which in turn will not allow the fuel control system to work within its "values"

www.youtube.com/watch?v=EBXvPFko0a0

Offline William Greene

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Re: 562XP / 555
« Reply #22 on: April 02, 2012, 03:46:05 pm »
William, when I was demoing the 562 at my dealers. I had ask about the autotune diagnostic tool etc and they didnt have it.   

From what you have shown here. It seems it should be a  must for the dealers to have to set the autotune up correctly with updates etc before being sold.  Do you feel the same way on this?

kevin, i could not imagine selling or starting up one of these new generation saws with out the proper tools!!! the dealers that have no tool or woodpile ,  certainly will be at a dis-advantage to say the least!

It seems you are having a high rate of failure though.  It is a misconception that these new saws are set/ready to roll out of the box(not saying you fall into this category).  There has been many instances of the metering lever being way to low, causing the saw to accelerate poorly and start hard warm and hot.  Also the pop off pressure is for some reason very high.  I clipped one ring off my 562 and it starts well at any temp.

Why the 100 fuel?  Just curious.   My 562 handles the transition from 87 to 92 flawlessly but vice versa, it takes a tank to adjust.

the reason for 100LL AV fuel is because i see so much trouble with ethanol fuel that come into my saw shop, i'd like to start out with the best grade of ethanol free fuel that i can get ahold of. (it certainly has been working real nice in my stuff) the customer has choice on what he wants to run. i try and tell them to run premium grade gas and not the low grade. i'm expecting to be able to see the differences in gas ,  in the download data from each saw . because the customer is keeping me in tune with his gas (hopefully)

nice post you added to my thread. just the stuff i was lookin' for!!!!
keep it comming.

i consider my high failure rate as "luck of the draw"......i've not had to many failures over the years to get all shook up about. all though 20 out of 25 of the first 455's i got, was an eye opener!

Offline mweba

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Re: 562XP / 555
« Reply #23 on: April 02, 2012, 04:02:31 pm »


the reason for 100LL AV fuel is because i see so much trouble with ethanol fuel that come into my saw shop, i'd like to start out with the best grade of ethanol free fuel that i can get ahold of. (it certainly has been working real nice in my stuff) the customer has choice on what he wants to run. i try and tell them to run premium grade gas and not the low grade. i'm expecting to be able to see the differences in gas ,  in the download data from each saw . because the customer is keeping me in tune with his gas (hopefully)

i consider my high failure rate as "luck of the draw"......i've not had to many failures over the years to get all shook up about. all though 20 out of 25 of the first 455's i got, was an eye opener!


I hear you on the ethanol.  Any equipment that sits for an extended period will have issues.  So far I am fortunate to have non alky 87,89,91,92 locally but I see that changing soon.

And to your point, this system is a god send for taking the customer out of the equation.  Short of raw fuel that is.  Did you generate a return for the faulty 555 carb?  If not I would be interested in the height and pop off....or the possession of the carb in question.

Offline William Greene

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Re: 562XP / 555
« Reply #24 on: April 02, 2012, 04:42:58 pm »
HVA warranteed the first 555 and i'm working on second one now. i still have the faulty carb here as they did'nt want it back.

Offline MacLaren

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Re: 562XP / 555
« Reply #25 on: April 02, 2012, 10:32:17 pm »
Mr. Green, for what its worth sir, the 562xp is by far the best stock saw "Ive" ever owned.  I like it that much.  Take into consideration though my experienced is very limited.  Ive owened 372xpw,395xp,390xp,555,346xp ans 2171.  But like I stated earlier the 562xp really does it for me.  I can certainly agree with you also about the 562xp cutting better than the 555.  Thats to take nothing away from the 555 as I felt it was a great saw too.  I sold the 555 to a friend and later on when I got the 562xp we decided to run them head to head per say.  I thought going into it there wouldnt be much difference at all.  The 555 actually had a few tanks ran thru her as well as a muffler mod.  The 562xp was never fueled.  The difference in cutting speed was noticeable.  The 562xp also spooled up better.  Just more saw IMHO.  I will say as for the 555, i only had 1 episode that she didnt want to fire warm.  That was easily fixed by taking the plug out and putting a little fuel in the plug hole.  She then fired up and never has missed a beat that i know of. 

Offline Cut4fun .

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Re: 562XP / 555
« Reply #26 on: April 08, 2012, 10:18:28 pm »
sawking made a video. Maybe something there for you guys and this thread.

http://www.youtube.com/watch?v=Lb8ZjHM5uco
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Online John Mc

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Re: 562XP / 555
« Reply #27 on: April 11, 2012, 09:24:26 am »
bummer. The video has been "removed by user"

Offline 660magnum

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We should share what we know... someone may learn...
That knowledge can live after us... and that "Pays It Forward".
Be all that you can be . . .

Offline J.Walker

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Re: 562XP / 555
« Reply #29 on: April 12, 2012, 05:55:50 pm »
Well the 562xpg models are now listed for sale so I might have one next week if all goes well. Been holding out for the heated edition forever.

 

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