Author Topic: husqvarna 394xp Rebuild  (Read 2062 times)

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Offline 05_sprcrw

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Re: 394xp Rebuild
« Reply #10 on: May 16, 2011, 05:45:27 pm »
Thanks Kevin, I know I had fun and I am already looking for my next saw to build, or find a junk burnt cylinder cheap that I can practice porting on.

Offline 05_sprcrw

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Re: 394xp Rebuild
« Reply #11 on: May 27, 2011, 07:49:50 am »
Well last night I finally worked up the nerve to try and port my 394xp last night. I think it turned out ok for a first time porting job.  A million thanks to everyone that helped me along the way. I still need a round stone so I can bevel the ports to make sure a ring doesn't catch. I have a muffler and new meteor piston on order, right now I have a forrester muffler that has a very restrictive opening so I wanted to start with a stock muffler that had the square muffler on it to give it more room to breath. I am thinking I will end up modding the muffler as well.

Before:





During:



After but still waiting for a round stone to bevel the ports. I did soak it in muriatic acid to clean up the cylinder.

I still have to clean the alum transfer up on the bottom bellow the exhaust port yet a little more. I don't know why it looks so terrible in this picture it definitely is not that bad in person.





Offline Cut4fun .

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Re: 394xp Rebuild
« Reply #12 on: May 27, 2011, 12:51:21 pm »
Just so you know. If you go to tighten up the squish, there is redneck ways to get the cylinder base down on your own.  ;)

The last time I paid a machinist to turn a cylinder and cut a pop up cost me $40.
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Offline 05_sprcrw

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Re: 394xp Rebuild
« Reply #13 on: May 27, 2011, 01:02:44 pm »
Just so you know. If you go to tighten up the squish, there is redneck ways to get the cylinder base down on your own.  ;)

The last time I paid a machinist to turn a cylinder and cut a pop up cost me $40.

Any suggestions on those redneck ways? I would really like to tighten it up if possible. I wish I had a machinist around here willing to do it that cheap.

Offline Cut4fun .

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Re: 394xp Rebuild
« Reply #14 on: May 29, 2011, 11:58:21 am »
I was hoping someone else would chime in with their redneck ways too. I sent this to him in a pm right after he ask.

You have to get a thick level square board or square Plexiglas or something similar and sturdy.  Make a round hole where the jug will slip in. Use different grit from rough to get it down  to fine to smooth out  (cant remember the name of the black cloth sand paper stuff. Emory cloth I think. Twist in circle motion till you get it down to what you want. Keep equal pressure and check for square on all 4 corners. Measure all 4 corners before starting and make sure to keep square and same amount off all around.
Works like a charm. 
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Offline 05_sprcrw

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Re: 394xp Rebuild
« Reply #15 on: May 31, 2011, 12:09:32 pm »
Thanks I ended up finding a buddy of a buddy that would be willing to do it for me. I am sending it out today to him. I opened the intake port a tad more on one side to make it more evening.  Here is the picture.


Also does the exhaust look good or can I bring the sides of the roof up a tad to get a little more flow, or would I be better off leaving it as is? I will be beveling the ports after the pot comes back from getting the squish adjusted.

Offline man of stihl

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Re: 394xp Rebuild
« Reply #16 on: May 31, 2011, 06:10:17 pm »
Looks real good! Again. I am not a pro builder. I am learning also, but this is what i would do. I would square up the edges a little on the exhaust but you still need to keep the dome shape on top of the port. Also it looks like you can grind closer to the flange holes. I only leave about 1mm of meat between the hole and the port. But on the inside i stay away from the witness lines about 2mm. And dont forget to chamfer your port!
Ron

Offline Cut4fun .

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Re: 394xp Rebuild
« Reply #17 on: May 31, 2011, 07:07:17 pm »
This is a comparison of 2 exhaust ports on 2 sachs dolmar 166 I had. One was race and one woods ported.  Just to share with you.




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Offline 05_sprcrw

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Re: 394xp Rebuild
« Reply #18 on: June 01, 2011, 08:08:50 am »
Thanks guys the more examples I can see the better.  ;D

I might take it a tad wider on the exhaust and work on squaring up the corners a little more yet.

Offline 05_sprcrw

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Re: 394xp Rebuild
« Reply #19 on: June 10, 2011, 01:49:47 pm »
Here was a quick first cut video of the saw ported.  Sorry the camera angle isn't good didn't have a stand or someone to film it. I was cutting about a 30" elm, with an 8 tooth rim and 28" chain.

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


 

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