Inside the Husqvarna 550XP

[mweba]

Hey Mitch, I have a PM850 I just put together and need to test, have any logs available? Old school vs. modern technology.

I will try to remember and call Steve Ericksen tomorrow to see if he stiil has all of those trees in the pasture.

Mark

Sure I could scrounge something up

Little bit of a mismatch don't you think?

 

[mweba]

DSC_0230 by mweba1, on Flickr


Ignore the idiot talking please

[video=youtube_share;E4J0xdYAPds]http://youtu.be/E4J0xdYAPds[/video]

 

[blsnelling]

Nice run down in the vid there Mitch

 

[Bluefish]

Great job Mitch, another sweet thread! Russ

 

[mweba]

Nice run down in the vid there Mitch

Anytime, Brad. These threads are fun to make but dang they take some time :crazy1:

All you will need is a 5mm allen and a crabide for the muffler.

 

[blsnelling]

Anytime, Brad. These threads are fun to make but dang they take some time :crazy1:

All you will need is a 5mm allen and a crabide for the muffler.

Thanks for the tip. I can't be running a stock muffler on mine, so the tools will be going with me to FL.

 

[Zombiechopper]

what physically moves the needles? Is it a turning electric motor? Do the needles move in and out like a plunger with a geared shaft on them maybe?

 

[heimannm]

Sure I could scrounge something up

Little bit of a mismatch don't you think?

Don't worry, I worked on the saw AND sharpened the chain...

Mark

 

[wigglesworth]

All hooked up. Thank you for making access to the port easier. What a pain on the 562.


DSC_0202 by mweba1, on Flickr

Hmm. So once you plug all that garb up, you put the headset on and it talks to ya? I also see you cut the trailer light wiring off of it. That should lighten it up a bit, no? But how ya gonna let the guy behind ya know your fixin to nimbly pull a sideways balancing act off?

Think saftey Mitch, think saftey.....

 

[TK]

When you ran it stock, did you find it was louder, quieter, or the same as any other 50cc stock saw?

 

[huskydude]

Impressive thread Mitch. Just like what you did when the 555 came out.

 

[mweba]

what physically moves the needles? Is it a turning electric motor? Do the needles move in and out like a plunger with a geared shaft on them maybe?

Will be doing some carb work so the controller will have to be removed. If I remember right, the whole unit is sealed making the "motors" impossible to see. My guess would be a coiled diaphragm set up like a speaker....but that is only a guess.

When you ran it stock, did you find it was louder, quieter, or the same as any other 50cc stock saw?

Would say the same as nothing really stood out for me. They easily get louder with a MM though.

 

[mtrees]

Thank you very much for this thread. I should hopefully get mine mid next week.

 

[mdavlee]

what physically moves the needles? Is it a turning electric motor? Do the needles move in and out like a plunger with a geared shaft on them maybe?

The 576 carb with autotune had the diaphragm connected to the black box if I remember right. I don't remember if it had all the wires and stuff on the carb like that one.

 

[Zombiechopper]

If it was a coil and magnet setup like a speaker it would either need current prior to startup to open the needles or they would have to return to a 'default' open resting position that would allow the saw to start. I don't think the second theory would allow a ported/muff mod saw to start well.

Very interesting stuff. Please take some pics if you have a carb apart. I'm very curious how it works

 

[blsnelling]

When you ran it stock, did you find it was louder, quieter, or the same as any other 50cc stock saw?

Sounds louder to me. That's why I thought it was MMd.

 

[Tzed250]

Sounds louder to me. That's why I thought it was MMd.

Mine seemed loud.

Did you ever find a 550?

 

[blsnelling]

Did you ever find a 550?

It'll arrive in Florida on Wednesday I guess that's better than not at all.

 

[mweba]

DSC_0230 by mweba1, on Flickr

Checking my 562 today, the carb is labeled REV F, not sure what that denotes? Could someone check a 545?? TK?

 

[Stumpys Customs]

I'm just gonna sit back & learn.