Project Impossible? - updated

heckenzwirn
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heckenzwirn
Edited Date/Time 5/13/2015 12:38pm
last year I´m started a new project. I bought just a frame and a swingarm. very bad conditions. think this frame standing few years in a backyard under a appletree :-)



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heckenzwirn
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heckenzwirn 12/5/2011 4:34pm
12/5/2011 4:34pm
after cutting, welding, sandblasting and painting



who know this bike?
PN27416
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PN27416 12/6/2011 4:40am
12/6/2011 4:40am
Sachs and I'm very envious of you. I'm just starting a replica of the few Sachs factory bikes that were here in the US. I have to use a Sachs/Hercules frame and do major modifications. You picture will come in handy.
Great job! please keep pictures coming as your project progress's
heckenzwirn
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heckenzwirn 12/6/2011 3:44pm
12/6/2011 3:44pm
PN27416 wrote:
Sachs and I'm very envious of you. I'm just starting a replica of the few Sachs factory bikes that were here in the US. I have...
Sachs and I'm very envious of you. I'm just starting a replica of the few Sachs factory bikes that were here in the US. I have to use a Sachs/Hercules frame and do major modifications. You picture will come in handy.
Great job! please keep pictures coming as your project progress's
PN 27416 , you right! is a Sachs MC 250 US- model. the original german model have a silver frame with blue plastics. it´s very interesting to here that you build a replica of this bike.
I bought long time bevor a Hercules GS 250 ( enduro-model) with a 5speed engine. the GS model have original a 7speed engine. the 5 speed was used in the MX models. good luck for me, because the 5 speed gearboxes are very rare. so I removed the 5speeder from the GS and rebuild it. together with the frame I had a good base for my dreambike.

5 speed:


7 speed:





The Shop

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slowvet
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slowvet 12/6/2011 6:44pm
12/6/2011 6:44pm
Very cool, keep us posted! Wasn't SWM also using Sachs?
heckenzwirn
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heckenzwirn 12/7/2011 1:53am
12/7/2011 1:53am
slowvet wrote:
Very cool, keep us posted! Wasn't SWM also using Sachs?
SWM using Rotax engines, sold in US under the name Bombardier. maybe the early bikes have Sachs, but I´m not sure. the Rotax was a very popular engine here in Europe. lot of companys used this. my Kramer ER 250 have a Rotax rotary disc valve.
heckenzwirn
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heckenzwirn 12/7/2011 12:48pm
12/7/2011 12:48pm
next step was to build a fork. remeber, I bought only the frame/swingarm. a original fork was not to be received . I want use this bike here in germany for competition, so I need a good fork with a good breake. Honda CR 250 fork with 38mm and a duplex drumbreake will be nice.






and the rules here for competition are not so strict. together with a set of rebuild FoxAirShox, the bike look´s fantastic, or?



PN27416
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PN27416 12/7/2011 1:31pm
12/7/2011 1:31pm
Heck, the bike looks great, that is trick!
Motor also. These transmissions confused me at first. I knew they had 5 and 7 speeds then I opened up my engine up and saw 4 gears per shaft and was baffled. Now I understand.
I'm sticking with 35mm forks I think, I found some longer ones and have Fox airs to use as well. I will have to have a custom pipe made. Are the gas tanks like yours available there in Germany? I have not found one here yet and was trying ebay Germany.
wpark89
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wpark89 12/7/2011 1:59pm
12/7/2011 1:59pm
Great project! And I thought my 2 Cagiva's were a lot of work. I'm not sure of the year but I have a few pictures of a Sachs that I took at the Primm Museum a few years ago. Andy Stacy was with me and he was pretty sure this was the factory Sachs his brother Frank raced..
heckenzwirn
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heckenzwirn 12/7/2011 2:19pm
12/7/2011 2:19pm
PN27416 wrote:
Heck, the bike looks great, that is trick! Motor also. These transmissions confused me at first. I knew they had 5 and 7 speeds then I...
Heck, the bike looks great, that is trick!
Motor also. These transmissions confused me at first. I knew they had 5 and 7 speeds then I opened up my engine up and saw 4 gears per shaft and was baffled. Now I understand.
I'm sticking with 35mm forks I think, I found some longer ones and have Fox airs to use as well. I will have to have a custom pipe made. Are the gas tanks like yours available there in Germany? I have not found one here yet and was trying ebay Germany.
yeah, the transmission is a bit different or? there is a other axle below. the needle-bearings of this axle are always scrap! check this befor you assemble the engine.
a friend of mine build by hand a very nice pipe. pic´s later. the gastank is a Hoss Industrie piece. made in america. I think it´s easier to find one in US than in germany. but if you can´t find one, i will have a look for you here.
heckenzwirn
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heckenzwirn 12/7/2011 2:23pm
12/7/2011 2:23pm
wpark89 wrote:
Great project! And I thought my 2 Cagiva's were a lot of work. I'm not sure of the year but I have a few pictures of...
Great project! And I thought my 2 Cagiva's were a lot of work. I'm not sure of the year but I have a few pictures of a Sachs that I took at the Primm Museum a few years ago. Andy Stacy was with me and he was pretty sure this was the factory Sachs his brother Frank raced..
oh my god, you know the Stacy brother´s? Frank was the only one worksracer for Sachs in US. must be in 1978. Trans AMA, or? the bike is a bit different to the production bikes. the plastics are from Hoss, rearwheel from the GS-models. handmade alu-airbox, pipe and the shocks also not stock. nice bike.you have more pic´s?
wpark89
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wpark89 12/7/2011 2:34pm
12/7/2011 2:34pm
Yes, that sounds right. I believe Frank raced for Sachs in '78 for the Trans AMA series. We saw this bike at the museum...Andy said he remembered Frank building the guard for the pipe in their workshop. I have no idea if this is the real works bike. This is the only other picture I have.
PN27416
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PN27416 12/8/2011 4:51am
12/8/2011 4:51am
PN27416 wrote:
Heck, the bike looks great, that is trick! Motor also. These transmissions confused me at first. I knew they had 5 and 7 speeds then I...
Heck, the bike looks great, that is trick!
Motor also. These transmissions confused me at first. I knew they had 5 and 7 speeds then I opened up my engine up and saw 4 gears per shaft and was baffled. Now I understand.
I'm sticking with 35mm forks I think, I found some longer ones and have Fox airs to use as well. I will have to have a custom pipe made. Are the gas tanks like yours available there in Germany? I have not found one here yet and was trying ebay Germany.
heckenzwirn wrote:
yeah, the transmission is a bit different or? there is a other axle below. the needle-bearings of this axle are always scrap! check this befor you...
yeah, the transmission is a bit different or? there is a other axle below. the needle-bearings of this axle are always scrap! check this befor you assemble the engine.
a friend of mine build by hand a very nice pipe. pic´s later. the gastank is a Hoss Industrie piece. made in america. I think it´s easier to find one in US than in germany. but if you can´t find one, i will have a look for you here.
thanks heck, i'll check those bearings for sure. And I had heard of Hoss tanks, i'll look into that as well.
heckenzwirn
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heckenzwirn 12/9/2011 8:48am
12/9/2011 8:48am
PN27416 wrote:
77 Trans am was the year Stacy campaigned the bike. Here is a side bar from Feb 78 MXA for a better view click the link...
77 Trans am was the year Stacy campaigned the bike. Here is a side bar from Feb 78 MXA for a better view click the link


http://f1.grp.yahoofs.com/v1/QPjhTq7s7-FaR-zWZwCrUuBsJOYSNmfqE6HkB3AfPP…
you are right man! my mistake. 1978 was the yaer of production here in germany. Stacy´s 1977 bike was a pre-production bike.
heckenzwirn
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heckenzwirn 5/10/2015 7:07am
5/10/2015 7:07am
today I see that I never finish this topic. sorry guys, sometimes I´m a lazy bastard ;-). was a hard project for me, but I´m very happy to finish the bike and enjoy the ride!
remember, I starting only with a frame. so I have to build a airbox. build a dummy from cardboard.



first one was from aluminium, but I wasn´t happy with this thing.




second one from glasfibre

heckenzwirn
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heckenzwirn 5/10/2015 7:10am
5/10/2015 7:10am
a friend build a pipe for me,looks really nice and fit´s perfect

Pit Row

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heckenzwirn
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heckenzwirn 5/10/2015 7:14am
5/10/2015 7:14am
before I decidet to build my one plastics I put the original on



ugly, or?
MaxPower
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MaxPower 5/10/2015 4:45pm
5/10/2015 4:45pm
Maybe it's me but the aluminum air box you made looks great to me.
How do you mod the Fiberglas into the shape you needed ?
PN27416
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PN27416 5/11/2015 2:01pm
5/11/2015 2:01pm
Looking good!!! I like the aluminum air box too. and the pipe
heckenzwirn
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heckenzwirn 5/11/2015 2:40pm
5/11/2015 2:40pm
the aluminium airbox was a bit to small, the filter dosn´t fit. was to complicated to change the design, so it was much more better to build a airbox from glasfibre. I use aluminium-mesh to create the right shape of the airbox and cover it with glasfibre, inside and outside. now I can use a bigger, modern slip-on airfilter.

now more pics from the bike for you:







tomorrow more ;-)
Kidkawie
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Kidkawie 5/12/2015 7:01am
5/12/2015 7:01am Edited Date/Time 5/12/2015 7:02am
Sick!

That's what I love about the 70's stuff. You can make alot of parts yourself and not need a CNC to do it.
heckenzwirn
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heckenzwirn 5/12/2015 9:34am
5/12/2015 9:34am
thanks guys ! nice to hear that you like the bike. here more pics



heckenzwirn
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heckenzwirn 5/12/2015 9:49am
5/12/2015 9:49am
engine power is great, much torque in low refs, much power in high. but the Fox Shocks are to long and create massive problems. I tried Corte&Cosso shocks, but wasn´t better. my latest update was a set of Öhlins, fresh rebuildet by self and now I´m happy! after the first mudrace I was a littlebit crying, but it´s ok for me. racebikes are made for racing, not for showrooms :-)



RM Mike
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RM Mike 5/12/2015 11:52am
5/12/2015 11:52am
What a neat bike. I am old enough to remember seeing 1 or 2 of these on the track. Is it hard to start?

BTW I have a big Sachs-Dolmar chainsaw. It is absolutely badass too.
Tdub13
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Tdub13 5/12/2015 12:01pm
5/12/2015 12:01pm
Amazing work Heck! That pipe looks absolutely gorgeous!

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