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Author Topic: Husqvarna 2100 performance upgrade?  (Read 3443 times)

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Offline SquareFile

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Husqvarna 2100 performance upgrade?
« on: December 21, 2014, 08:51:09 am »

Will a 395xp piston help performance on 2100cd?

If so, what modifications need done for the piston to work?
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Offline bloodontheice

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Re: Husqvarna 2100 performance upgrade?
« Reply #1 on: December 21, 2014, 09:22:09 am »
I think the 395 is slightly taller only a mil or two from what I can remember.

I lucked out and picked this NOS thin ring piston and rings up off ebay a few weeks ago.


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Offline SquareFile

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Re: Husqvarna 2100 performance upgrade?
« Reply #2 on: December 21, 2014, 09:38:48 am »
I currently have a thick ring piston with a few scratches on the skirt in my saw. Its useable. If a 395xp piston is a little taller from the wrist pin I can face it off. Do you know if I'd gain performance? I know I've read that some builders like the 395 piston but I cant find in my searches.
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Offline man of stihl

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Re: Husqvarna 2100 performance upgrade?
« Reply #3 on: December 21, 2014, 10:04:04 am »
If your tightening the squish with a taller piston there will be performance gain. I don't know any thing about the 395 piston but If it was me I would find a thin ring 2100 piston and machine the cylinder to desired squish. That's what I did with mine. Its extremely torquey. I love that saw....
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Offline man of stihl

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Re: Husqvarna 2100 performance upgrade?
« Reply #4 on: December 21, 2014, 10:06:40 am »
If I remember right the stock squish was .050. Now its .025
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Offline srcarr52

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Re: Husqvarna 2100 performance upgrade?
« Reply #5 on: December 21, 2014, 10:55:23 am »
Yes, it can be used but you have to machine the squish band of the cylinder to make it swing. 
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Offline SquareFile

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Re: Husqvarna 2100 performance upgrade?
« Reply #6 on: December 21, 2014, 12:00:24 pm »
If I machine the squish band for proper clearance, wouldn't the port timing be effected with the taller piston?

Would it increase performance?
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Offline 660magnum

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Re: Husqvarna 2100 performance upgrade?
« Reply #7 on: December 21, 2014, 01:42:36 pm »
Some people take a little rim cut on the deck of the taller pistons in the squish area and this minimizes the timing difference.
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Offline srcarr52

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Re: Husqvarna 2100 performance upgrade?
« Reply #8 on: December 21, 2014, 05:56:32 pm »
Quote from: SquareFile on December 21, 2014, 12:00:24 pm
If I machine the squish band for proper clearance, wouldn't the port timing be effected with the taller piston?

Would it increase performance?

Yes, it does alter the port timing and the exhaust and transfers would have to be raised up to get the performance you want.

Quote from: 660magnum on December 21, 2014, 01:42:36 pm
Some people take a little rim cut on the deck of the taller pistons in the squish area and this minimizes the timing difference.

You could do a pop-up on the piston to make it clear which would leave the exhaust and transfer timing alone.  I'd personally still change them to get more performance though.  Here is a 2100 with a 395 piston I did.  It also has a 394 carb and a custom made v-stack. 

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Offline SquareFile

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Re: Husqvarna 2100 performance upgrade?
« Reply #9 on: December 21, 2014, 07:07:33 pm »
Quote from: srcarr52 on December 21, 2014, 05:56:32 pm
Quote from: SquareFile on December 21, 2014, 12:00:24 pm
If I machine the squish band for proper clearance, wouldn't the port timing be effected with the taller piston?

Would it increase performance?

Yes, it does alter the port timing and the exhaust and transfers would have to be raised up to get the performance you want.

Quote from: 660magnum on December 21, 2014, 01:42:36 pm
Some people take a little rim cut on the deck of the taller pistons in the squish area and this minimizes the timing difference.

You could do a pop-up on the piston to make it clear which would leave the exhaust and transfer timing alone.  I'd personally still change them to get more performance though.  Here is a 2100 with a 395 piston I did.  It also has a 394 carb and a custom made v-stack. 



Sounds like its holding some crazy RPM's. Great job

I don't have porting tools, degree wheel or knowledge of good numbers. So I think I'm just going to cut a popup on a 395 piston.

Thanks for all the help
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