Author Topic: Husqvarna 550xp Pro Camp.  (Read 12545 times)

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Offline mweba

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Re: Husqvarna 550xp Pro Camp.
« Reply #80 on: August 07, 2012, 10:02:34 pm »
I'm usually a man of few words so bare with me  :)

http://www.youtube.com/watch?v=E18quXUqOz0

Offline EHP

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Re: Husqvarna 550xp Pro Camp.
« Reply #81 on: August 07, 2012, 11:11:07 pm »
your kind of over thinking some of it , its a pretty simple system, the walboro autotune in my books is a better system than zama's on the  562's . The metering holes in the 562's is to lean on idle circuit and to rich on midrange and that has nothing to do with the autotune , the autotune cannot make up for the wrong fuel curve . I took my 562's carb a part and changed the hole sizes in my carb on idle and midrange , A lot better now plus made my strato carb come on sooner , that also helped clean up the mid range . I hate a saw that when I hit the throttle it does not come to life NOW

Offline mweba

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Re: Husqvarna 550xp Pro Camp.
« Reply #82 on: August 07, 2012, 11:28:57 pm »
A better explanation on the carb mod would be appreciated.  Afraid I'm not 100% with you.   I did note per the throttle position sensor, the strato secondary starts to open at 40%.  Thanks Ed

Offline EHP

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Re: Husqvarna 550xp Pro Camp.
« Reply #83 on: August 08, 2012, 12:09:36 am »
I have had a couple 562's carbs stripped down, the first carb had a .021 low speed hole the later carbs have .022 ' hole , this is still to lean on idle so you either got to drill low hole bigger or make the notches in the butterfly smaller to let less air into motor on idle , I choose to drill the low hole bigger , I'm sure zama would of done this but to pass the EPA they had to make the saw idle very lean  , now when you hit the throttle on the 562's you get a bog then they come to life , mid range is to rich , they have 2 holes letting fuel in on mid range so you need to figure out how to resize these holes smaller , I blocked the next hole up from the idle circuit right off so only running 1 midrange hole now , that made a hell of alot better throttle response . Now playing with the stratos can make the mid clean up real nice , but you have to leave enough play for when you pull the choke on that only the butterfly moves in the main carb , if your moving the stratos butterfly when choking it makes cold starting abit harder cause your not getting full air pulling  threw main carb , now if you make your strato come on earlier your going to have to change the cam arm ratio cause you will end up with the stratos way over centre  so drilling a new hole in the strato butterfly arm is needed , Now this stuff is just me and what I do as like I said I hate running a saw that is not as close to perfect as I can get it

Offline mweba

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Re: Husqvarna 550xp Pro Camp.
« Reply #84 on: August 08, 2012, 09:21:10 am »
Ed,
Thanks for the explanation on your mods.  Guess I misunderstood, thought you meant I had over engineered some parts of it in my own mind, getting some of it wrong.  Turns out we are on the same page just took a different approach. 

The way I dealt with the hesitation was increasing the size of the venturi.  This cured the issue for me while giving a little more useful power curve on the top end.   My theory is at mid range the extra air leans out the mixture slightly reducing hesitation while dropping the low pressure at the nozzle forcing the MP to feed more fuel to stay with in spec.  Although speed in the cut and the fuel mixture settings shown by the DT tool when linked are my only supporting evidence....One things for sure, if ported right, they are very strong.

Offline EHP

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Re: Husqvarna 550xp Pro Camp.
« Reply #85 on: August 08, 2012, 02:59:42 pm »
I open up the venturi myself as this does help on power , just like most ported motors , if you get it ported correct they work very well and produce good torque , I know running a ported 562 brings a smile to my face  ;D and thats not easy cause I do not smike much  :D

Offline William Greene

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Re: Husqvarna 550xp Pro Camp.
« Reply #86 on: August 09, 2012, 05:39:39 am »
mitch, you and ed sure brought a smile to my face!!!....as i am a man of few words too!

you guy's just let me know whatcya need for parts to correct them new saws your working on,and i'll get'em right out to ya  ;D

i got a 562 full wrap heated handle in unopened carton that need's "tendin' too"......bye the sounds of the above post's.

Offline William Greene

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Re: Husqvarna 550xp Pro Camp.
« Reply #87 on: August 23, 2012, 09:47:05 pm »
glad you got "the package" whatchya think about the contents.....got any new's?

Offline mweba

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Re: Husqvarna 550xp Pro Camp.
« Reply #88 on: August 24, 2012, 10:49:26 am »
I never did find the root cause of the valve failure.  The unit functioned properly besides that one issue.

Been waiting for some free time to swap that carb onto my 562 to get a feel for it.  Will keep you posted.

Offline Cut4fun .

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Re: Husqvarna 550xp Pro Camp.
« Reply #89 on: October 15, 2012, 05:21:20 pm »
Got to run a woods ported 550 at the last GTG Sat. Love the rear handle feel thicker, noticed the saw felt light and nimble with 16" 325 on it.  Really think the saw could use 3/8 chain IMO.   

If I had to choose my woods ported OE 346 45cc that pulls 3/8 with authority or the woods ported 550 I would take my OE all day. But of course I have traded and sold all my NE 50cc too.   Maybe when they come out with fuel injection and all the dealers are up to speed on this new stuff maybe. But for right now I am staying old school till they get the kinks worked out.

I do love the feel of the 550 though a lot better then the test run I had with the stock 562.

Now I need to get a hold of procarbines stock 550 to see how it cuts before he muffler mods it then run it later with muffler mod.
REDNECK Saw Repair Getter Done

 

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