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Author Topic: New from Germany with Sachs 50cc's  (Read 264 times)

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Offline oakdesign

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New from Germany with Sachs 50cc's
« on: March 31, 2017, 04:29:37 AM »
Hello guys
may I introduce myself. My name is Richard I'm 47 years old and from the South of Germany near Munich.
I grew up with smell of 2 stroke engines. My grandparents owned a specialized bicycle and Motorbike (Mopeds) retail and workshop until 2001. I already started to do my first repairs at the age of 10 or so.

Then there was a break of about 25 years.
In 2013 I started again to get into the 2 stroke fever.
Bought a first Hercules Moped for restoration and then a second and a third. After doing the first things, I rembered all the basics(repairing and tuning) I learned from my grandpa and dad back in the late 1970th and early 1980th.

My First Bike a Hercules K50 Sprint from 1973 still with the Stock engine
Sachs 50s
5.8 HP
50cc Cast Iron Cylinder
5 Gear
44 mm stroke 38 mm bore 2 transfer ports

this bike got a little Engine tweak

the modifications I have made
  • Built in 6 Gear transmission from a Sachs 50SW (LC Version)
  • Gilardino 80cc Alu Nikasil plated Cylinder 48mm bore 44mm stroke 4 tranfer ports
  • Upgrade from a 18 mm Bing to a 26 mm Dellorto carburator
  • replaced stock crankshaft with a RITO crankshaft with enforced crank pin and full crank cheek (don't know is that the right englsh term for it??)
  • pipe is custom built by Ralf Waldmann aka "the most sucessfull Moto-GP rider who never won the World Chapionship"

The second one how I got from ebay Hercules K50 RL from 1976


This how she looks like at the moment. The Engine is still the Stock Engine but completely revised.
Engine Sachs 50s
Original Mahle Cylinder Nicasil plated 38mm bore 44 mm stroke with 6.25hp
Original Bing 1/19/31 carburator but will be replaced with a Mikuni VM20-151



And my latest project a Hercules Ultra III LC from 1979 but not started to rebuild yet.


Regards Richard

Offline jspooner

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Re: New from Germany with Sachs 50cc's
« Reply #1 on: March 31, 2017, 05:07:24 AM »
Cool looking little bikes.  :thumbsup:
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Online jimmer

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Re: New from Germany with Sachs 50cc's
« Reply #2 on: March 31, 2017, 06:40:21 AM »
That is an excellent collection of tiddlers! Is that really dual discs on the front of the '79 LC? 😎

Offline oakdesign

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Re: New from Germany with Sachs 50cc's
« Reply #3 on: March 31, 2017, 07:16:05 AM »
Hi,
yes these are dual discs. Hercules was the first of the 3 major Moped Manufacturers (Hercules, Zündapp and Kreidler) having dual disc on the 50cc's already in 1977 with the first Hercules Ultra ("Die Rote" - " The Red One")

Regards Richard

Offline Cambo1200

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Re: New from Germany with Sachs 50cc's
« Reply #4 on: March 31, 2017, 02:32:20 PM »
Those bikes look like a lot of fun!
I travel to Germany a few times a year for work, just east of lake Constance. I would love to bring over an RD some day and do some riding in the Alps, there are some amazing roads over there.

Offline oakdesign

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Re: New from Germany with Sachs 50cc's
« Reply #5 on: March 31, 2017, 04:45:11 PM »
I live near the Alps just North of Munich. In June I'll go on a special Trip to the Alps at the VI Oetztal Moped Marathon Event.
1111 Riders
Only Rule: 2 Stroke not more than 50cc  with 1 track (is that the right technical Term?) so nothing like a trike.
1 Day 160 mi over 4 mountain passes in Austria and Italy.
Most of the riders take part with their smaller motorcycles so about 1-3 HP max. Funiest Road Trip you can make. :dance:

Offline dvsrd

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Re: New from Germany with Sachs 50cc's
« Reply #6 on: April 01, 2017, 02:26:25 AM »
Very cool! I remember one guy had a Kreidler RSGS 50, while everyone else had Japanese 100 cc bikes. This all was down to Norwegian licence laws, 16-18 year olds were limited to 100 cc bikes, supposedly restricted to 7 hp. Obviously everyone ripped out the restrictors, to get the "full 10-12 hp" from these bikes. But still that little green 50 cc screamer kept up with most of the 100 cc bikes.
And the lucky Kreidler 50 RSGS owner upgraded directly to a Kawasaki Z1300 the day the turned 18.....Shortly after, he put a turbocharger on that same Z1300.  You could call it a steep progression curve :)

Offline SoCal250

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Re: New from Germany with Sachs 50cc's
« Reply #7 on: April 01, 2017, 05:09:59 PM »
Welcome Richard. Cool little bikes!

That 76 has an interesting front suspension design. Also radial fins on the head like DG heads and some dirtbikes. I like the rearsets in your build pic
91 TZR250R (3XV);  89 FZR400W
79 RD400F Daytona;  77 RD400D - mod project
75 RD250B (350 project);  75 RD200B (in boxes)
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Offline oakdesign

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Re: New from Germany with Sachs 50cc's
« Reply #8 on: April 02, 2017, 08:35:25 AM »
The Front Suspension "Schwinggabel" Swing arm system was used by Hercules from the 1950's until 1977 the Model on my pictures is one of the last using this suspension type.
It' quite a different feeling to ride. You either love it or hate it. I love it. As I'm living in a town with a medieval town center with lots of Cobblestone roads it is much smother to ride
Below a picture of one of the early Version on a Hercules / DKW 75 GS from 1958

« Last Edit: April 02, 2017, 08:43:32 AM by oakdesign »

Offline oakdesign

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Re: New from Germany with Sachs 50cc's
« Reply #9 on: April 02, 2017, 12:36:28 PM »
The Rearsets are a combination of aftermarket parts and some parts build in my shop.










Offline pushin9s

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Re: New from Germany with Sachs 50cc's
« Reply #10 on: April 12, 2017, 05:40:54 AM »
The picture of the yellow bike in your first post looks remarkably like the RD60.  Amazing little bike and a hoot to ride but limited to backroads only due to my size.  Those little bikes are fun to ride.  I was in Europe about 5 years ago and we rode rented BMWs from Thun, Switzerland to Munich (to visit BMW Welt) then down to the Deutsch Alpenstrause over to Austria, back over to Stelvio and back up to Thun.  Remarkable experience in every way.  The people, the scenery were amazing and what was most noticeable was how clean everything was.  You never see trash, abandoned cars, junk in yards; everything was picture post card beautiful.  :thumbsup:

What fun it would be to be able to partake in that Alpine ride with a RD50 or YSR50!  It would be worth flying over there and doing.  Nice bikes and thank you for sharing.

Offline oakdesign

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Re: New from Germany with Sachs 50cc's
« Reply #11 on: April 13, 2017, 04:23:23 AM »
The RD50(DX) was one of the competitor to my Hercules Sprint. But back in the 1970's the German market was dominated by the three german manufactures Hercules, Zuendapp and Kreidler. About 85% of all 50cc's sold have been manufactured by those 3 companies. So it would be easier to get 10 Hercules barn finds than a single RD50.

This changed dramatically by the year 1980. With a change in the german driver licencing law and some other licencing laws the german governement established the 80cc class which by that time was limited to a max HP of 8.5 HP at 6000 revs.
The insurance rate of the "howling" 50cc's went up in a way that nearly no 16 year old was able to afford those.

That was th point when the Japanese manufactures came into play. The german manufactures just tried to but a new engine into their old bikes but no new innovations, wheras Yamaha, Honda, Suzuki could easily adopt their 125cc to meet the german regulations.

By that time my grandfather owned one of the biggest bike,Moped shop in southern Germany. From one day to the other Hercules was not our best selling brand anymore and we sold much more Honda. Especially the Honda MB8, MT8 and their successors MBX 80 and MTX 80 as their price was nearly have of the comparable German 80cc's
« Last Edit: April 13, 2017, 04:25:10 AM by oakdesign »

Offline 50gary

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Re: New from Germany with Sachs 50cc's
« Reply #12 on: April 14, 2017, 08:32:45 PM »
I have an "Earles" front end on my 1967 BMW R50/2  I like it on the BMW, I don't have one but they are said to be good for sidecars.
  Cheers, 50gary
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Offline oakdesign

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Re: New from Germany with Sachs 50cc's
« Reply #13 on: April 16, 2017, 11:03:47 AM »
Indeed works great on sidecar.
This is a Hercules K50 RL custom that I have built together with my best friend for his wedding




Offline m in sc

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Re: New from Germany with Sachs 50cc's
« Reply #14 on: April 18, 2017, 12:42:58 PM »
oh.. oh damn thats cool.  :thumbsup:
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