Turning A Stihl 038 Into A Ported 038 Magnum

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Mastermind

Mastermind

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Here's a really nice 038. It's an early magnesium tank, non brake, point ignition saw. I've never seen a better looking example.

LeesStihl038001.jpg


LeesStihl038003.jpg


All OEM parts for this build. The owner is a Stihl tech, and has done a fine job on bringing the saw this far.

LeesStihl038002.jpg


In order to fit the jug on this case the bolt holes must be slotted inward a bit.....

LeesStihl038007.jpg


And the case has to be clearanced for the piston skirt.

Normally I would split the case to do this step but the case gasket, seals, and bearings are in excellent condition so I taped it up and covered the area I'm working in with grease to hold any chips. Then I used a vacuum to clean it up before I removed the tape and grease.

LeesStihl038008.jpg


This is where I gave up for the night........more tomorrow. :)
 
you lazy bum.

btw
i heard you ported this saw.
[video=youtube_share;fdwC4vhc594]http://youtu.be/fdwC4vhc594[/video]
 
That is a very nice looking 038 AV. I'm suprised it has the newer gas and oil caps on it unless they changed them. Looks like it will be an interesting thread.
 
I thought I had a mint 038, that thing is very clean. When converting a regular 038 to a mag will the converted saw run the same as a factory mag? I'm thinking about case differences.
 
young said:
you lazy bum.

btw
i heard you ported this saw.
[video=youtube_share;fdwC4vhc594]http://youtu.be/fdwC4vhc594[/video]
Click to expand...

Yeah.......when I was 10 years old......that was back when I was still using a cold chisel and a horse shoe rasp........looks like Ol' Chuck dulled the dang chain......bastard! :msp_sad:

fastLeo151 said:
I thought I had a mint 038, that thing is very clean. When converting a regular 038 to a mag will the converted saw run the same as a factory mag? I'm thinking about case differences.
Click to expand...

Good question......we shall see. :msp_wink:
 
I never had to mess with the case , on 038S to mag conversions. Factory mentions a need for this on 038 to 038S conversions, they have a template

You will find even a dual port 038S mufflers is in need of width.

Plan a on a Bing or a Tilly?

I'm interested to see what happens with the ports.

This conversion has been done with OEM and TECOMEC by me, the latter works fine too
 
fastLeo151 said:
I thought I had a mint 038, that thing is very clean. When converting a regular 038 to a mag will the converted saw run the same as a factory mag? I'm thinking about case differences.
Click to expand...

The 038S conversions I've done are strong/stronger than My 038 Mag, but they had some tweaks and the Mag is OEM.

Internals are mint on the Mag, , factory piston with OEM machine marks, so a good comparision.

Oh yes a Bing or a Tilly from a 038S run the same. Don't use a 038 tilly as it is smaller
 
Mad Professor said:
I never had to mess with the case , on 038S to mag conversions. Factory mentions a need for this on 038 to 038S conversions, they have a template

You will find even a dual port 038S mufflers is in need of width.

Plan a on a Bing or a Tilly?

I'm interested to see what happens with the ports.

This conversion has been done with OEM and TECOMEC by me, the latter works fine too
Click to expand...

I only have the 038 Tilly.....I need the Mag carb...Bing or Tilly.

redoakneck said:
Very cool MMind!!! I have an 038 super electronic that I just went thru, runs very well but... could be up-graded???
Click to expand...

Upgrades......I like upgrade almost as much as I like pie. :msp_biggrin:
 
Mastermind said:
I only have the 038 Tilly.....I need the Mag carb...Bing or Tilly.



Upgrades......I like upgrade almost as much as I like pie. :msp_biggrin:
Click to expand...

Mastermid,

038S Tilly and the Bing have same size venturi.

The last conversion I did , either carb ran best at 1 1/4 out, slight MM, polished Ex port

Parts are way cheaper for the Tilly.


EDIT : MM early Tillys were smaller, you want a SUPER Tilly or BING

Let me know what you do to the ports, I was very mild in my conversions.

Thanks!

Forgot, about !000' elevation, 100LL and Golden spectro 50: 1
 
Last edited:

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