Porting The Husqvarna 572XP

[Mastermind]

Really a simple saw to do that responds well to mods.

First......I mill a flat spot on top of the jug to make setup for the rest of the machine work easier.

 

[Mastermind]

Then I cut the squish, and the base to give it a bit more bang.

 

[Mastermind]

The porting part is the easiest part of this build.

Just clean up the casting lines in the transfer passages, raise the uppers a little, and raise + widen the exhaust port.

 

[Mastermind]

There's a couple of places to pay attention to. The cylinder extensions need the same amount off of them that you take off the base + the gasket if you are ditching it. The radius on each side need to be clearanced as well.



Then there is this spot the the transfer cover touches...

 

[Mastermind]

Ignition timing takes advancing well.....I look to move the flywheel about 1/4" CCW.

 

[Mastermind]

The muffler.....

I cut this little feller off.



And add this.



The difference.

 

[Mastermind]

I open the area under the deflector up too......and use a screen with a more open mesh.

 

[Mastermind]

Questions? Comments? MILD criticisms?

 

[deye223]

Looks good to me ...... got any vid Randy

 

[srcarr52]

I like that you kept the deflector at an angle. Keeps the exhaust from blowing back off a log at the operators hand.

 

[Onan18]

Does the piston need any work?

 

[Onan18]

How are they holding up in the field after mods?

 

[Mastermind]

Looks good to me ...... got any vid Randy

Nope. No video my friend. I've done a bunch of these. Haven't made any videos since I was testing to find my recipe.

 

[Mastermind]

Does the piston need any work?

Not in my opinion. The relationship between the strato opening, and the intake opening points is about perfect after the machine work.

 

[Mastermind]

How are they holding up in the field after mods?

The guys I'm selling them to have only had one problem. They break the chain brake handles pretty often. I'm not saying that's a issue with the saw......some guys can break an anvil with a rubber mallet.

 

[mortalitool]

Awesome info!

Great pics. nice tidy work.

Are you machining .029 from the base and ditching the base gasket on these?

 

[Mastermind]

Awesome info!

Great pics. nice tidy work.

Are you machining .029 from the base and ditching the base gasket on these?

Well......I normally use a base gasket. One of these two saws ended up with a torn up gasket......and I don't have one here to replace it with. So......I cut .029 from one, and .033 from the other and assembled them without a base gasket. I took .040 from the squish on both.

 

[deye223]

Nope. No video my friend. I've done a bunch of these. Haven't made any videos since I was testing to find my recipe.

Just had a look on the tube some good some not so ......

Cheers D

 

[mortalitool]

Well......I normally use a base gasket. One of these two saws ended up with a torn up gasket......and I don't have one here to replace it with. So......I cut .029 from one, and .033 from the other and assembled them without a base gasket. I took .040 from the squish on both.

Right on! Made it work with what you had. I like that. Keeps things moving forward!!

I appreciate the reply. I have one on the bench now and was just doing some visuals on it. Comparing it to the MK2 and a 562. The exh roof is interesting on these 572's as with the exh roof on the MK2. In your picture of the exh roof i noticed you took care of "that" ( I dont know what it would be called, the recess area on the 572 )

 

[Mastermind]

Just had a look on the tube some good some not so ......

Cheers D

I had a few videos on my phone.......I thought. Turns out I took some pictures rather than starting a video. We could do a series on that. Old Farts Meet Smart Phones