Author Topic: Dolmar Sachs 120si restoring - Picture story  (Read 774 times)

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Offline m_marc

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Re: Dolmar Sachs 120si restoring - Picture story
« Reply #10 on: February 07, 2019, 12:23:05 pm »
At the end of cleaning it does not look so bad.
I disassemble and riassemble cylinder and piston, they have a good tolerance and they are in very good condition. I riassembled with new base gasket.
Also the base bearings and needle cage are good.

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I disassembled carb and I replaced gaskets and diaphragm. I replaced also spark plug, wire and cap.

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I cleaned up and repaint muffler and mounted with new bolts.

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Dismounted, cleaned, greased and remounted oil pump. New oil hose too.

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I replaced starter rope and reassemble with fan cover and I mount the handle.

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Offline Cut4fun .

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Re: Dolmar Sachs 120si restoring - Picture story
« Reply #11 on: February 07, 2019, 12:51:56 pm »
Looking good. Watch the Tygon on the oiler and fuel line.    Heat gets to them. If real tygon is better but if copied stuff sold as tygon is crap.

I use OEM black echo lines now.    Watch them too there is aftermarket copies of it too.
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Offline m_marc

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Re: Dolmar Sachs 120si restoring - Picture story
« Reply #12 on: February 07, 2019, 12:58:27 pm »
Today mechanic at shop find an old used sprocket cover with complete brake assy from a 116si or 120si. I buy them for 50, I'm feel very lucky.
There's only one problem: the brake spring it's broken, several years of use worn out it.
The hand guard is good but the lever it is bended; it's not a big problem.

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Then, this is my idea for rebuilt the brake spring
I use a steel band; I bend them around a pipe and after that I file the parts where it overlaps (where it must be less wide).
At one extremity I bend it for fix it into the cover, at the other extremity I fix it with a pin at the part connect with the brake lever.
I don't really know if this solution works but the steel band seems strong and thicker than the original spring. We'll see...

In my hand a steel band, the same I used for rebuilt the spring.

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At the left the new spring "self-builded" compared with the old one at right (you can see the worn out extremities).

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I have not reassembled the brake in the cover yet.
For now I'm at this point, during weekend I will go on.
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Offline m_marc

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Re: Dolmar Sachs 120si restoring - Picture story
« Reply #13 on: February 07, 2019, 01:08:30 pm »
Looking good. Watch the Tygon on the oiler and fuel line.    Heat gets to them. If real tygon is better but if copied stuff sold as tygon is crap.

I use OEM black echo lines now.    Watch them too there is aftermarket copies of it too.

Thanks for clarification.

I don't know if it is real Tygon (but I think so) but I use it for a long time and I never had problems.
On other engines even after a long time exposed to heat and fuel remains elastic and does not dry out.
I have less than a meter left at home, I remember it was quite expensive.
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Offline Cut4fun .

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Re: Dolmar Sachs 120si restoring - Picture story
« Reply #14 on: February 07, 2019, 05:09:50 pm »
Real will have white lettering stamped on the line TYGON and type # every few 6" or feet.  Fake wont.





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Online 3000 FPS

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Re: Dolmar Sachs 120si restoring - Picture story
« Reply #15 on: February 07, 2019, 10:01:21 pm »
Looking good so far.
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Offline HolmenTree

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Re: Dolmar Sachs 120si restoring - Picture story
« Reply #16 on: February 08, 2019, 09:51:57 am »

Hi guys,
I'm new of this forum, I'm Italian and I live in Nothern Itay near Switzerland.
I want to present you my recent project.

This autumn I decided to clean the toolshed at my granparents' house and in the middle of junk and sundries I found this:

It's a 1989 Dolmar Sachs 120si in bad condition (subsequently become 6800, if I'm right).


I immediately decided that it could not stay in those conditions anymore and that I would have taken some time to fix it.

I did not have much time at home so far but now it's time to start, so I decide to start this post to tell you about the restoration live.

I want to start with some information that I collect: my grandad buy this chainsaw used from a friend in 1991 (the production year could be 1988-1989) and use it for several


It could be a late 1990-'91 by looking at the Made in Germany name tag not West Germany (1990 and older).
I used a older Sachs Dolmar 123 in the mid 1980's,  it was a quick powerhouse of a saw. I believe these saws had quad transfers which why they ran so strong plus the good muffler with oversized outlet pipe.
Husqvarna  got quad porting on a 68-70cc saw  much later on the 372XP. Not sure
 about the earlier 371XP

http://chainsawrepair.createaforum.com/index.php?action=dlattach;topic=7167.0;attach=26485;image
Making a living with a saw since age 16.

Offline 660magnum

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Re: Dolmar Sachs 120si restoring - Picture story
« Reply #17 on: February 08, 2019, 10:41:14 am »
Excellent clean up and restore
We should share what we know... someone may learn...
That knowledge can live after us... and that "Pays It Forward".
Be all that you can be . . .
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Offline m_marc

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Re: Dolmar Sachs 120si restoring - Picture story
« Reply #18 on: February 25, 2019, 12:02:46 pm »

It could be a late 1990-'91 by looking at the Made in Germany name tag not West Germany (1990 and older).


Excellent observation.
On the brake cover that I had bought recently there is "Made in West Germany" because probably it arrives from a older chainsaw.

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I reassemble the brake system with new home made brake spring.

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At hte end I file the chain and mount it on the bar with two new very well made nuts, two nice pieces.
They have an inset that moves freely when you tighten the nut, in this way they never grind on paint.

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The chainsaw works perfectly, he turned on at the third shot; it only needed a carburation adjustment.
Now it needs new stickers, I plan to have them made by a graphic shop near my town, after that it will be ready for a test.

For the moment, in conclusion I'm pretty satisfied about the result and I'm glad the engine did not have big problems.
I'm very happy to have brought back an historical chainsaw.
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Offline 660magnum

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Re: Dolmar Sachs 120si restoring - Picture story
« Reply #19 on: February 25, 2019, 02:45:46 pm »
I'm certain you will really enjoy the 120Si as that model has been a favorite for years. And for you, the nostalgia of it being a heirloom and something you restored yourself. 
We should share what we know... someone may learn...
That knowledge can live after us... and that "Pays It Forward".
Be all that you can be . . .
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