1971 R75/5 Partial Restoration

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skychs
Posts: 409
Joined: Fri Nov 25, 2016 2:12 pm
Location: Richmond VA

1971 R75/5 Partial Restoration

Post by skychs »

A friend of mine asked me to help him restore his 1971 R75/5. It's a mess, spray paint everywhere to include the engine but Im sure it will all come out fine. I'm starting this blog to document the work and to keep my friend up to date. History of the bike as I get it. Let the fun begin.
Chuck
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Last edited by skychs on Fri Dec 18, 2020 6:20 pm, edited 1 time in total.

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srankin
Posts: 164
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Location: Spencerport, NY USA

Re: 1971 R75/5 Restoration

Post by srankin »

I am looking forward to your progress. Have fun. St.
Owner of a 84, R80RT and 78, R100RS

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kingcowie
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Joined: Wed Oct 28, 2020 1:29 pm
Location: Wollongong

Re: 1971 R75/5 Restoration

Post by kingcowie »

Excellent bike,,look forward to the photos
Shane
Wollongong, Australia
71 R75/5
64 R50/2 Project
77 R100RS Project

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srankin
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Joined: Fri Jul 14, 2017 8:45 pm
Location: Spencerport, NY USA

Re: 1971 R75/5 Restoration

Post by srankin »

One thing I see is you have the chrome side covers, I understand they are hard to find in good condition. The one I see looks pretty good along with the chrome on the gas tank.

Pictures may lie and the bike may be worse than what they show. LOL, only you know that but it looks to be in pretty good shape all considering it's age. St.
Owner of a 84, R80RT and 78, R100RS

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skychs
Posts: 409
Joined: Fri Nov 25, 2016 2:12 pm
Location: Richmond VA

Re: 1971 R75/5 Restoration

Post by skychs »

Today I started to take the bike apart. All the parts seem to be there, most of it in good condition. It's the multiple layers of spray paint that is going to haunt me. Hopefully the sand blasting will take care of most of it.

Question .... The seat pan is plastic. Is that standard on the R75? On my R90S its a metal pan.
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terratenney
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Re: 1971 R75/5 Restoration

Post by terratenney »

Who in their right mind would spray paint the engine?

Looking forward to the progress and learn a thing or five. :D

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skychs
Posts: 409
Joined: Fri Nov 25, 2016 2:12 pm
Location: Richmond VA

Re: 1971 R75/5 Restoration

Post by skychs »

It was a very productive day in the shop today. I was able to strip the bike down to the frame, front end and front wheel. Everything looked good. Everything came apart as expected. Tomorrow I will start on the front end then its time to start ordering parts.
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skychs
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Location: Richmond VA

Re: 1971 R75/5 Restoration

Post by skychs »

Note ......

I need to apologize in advance for some of the photos. Im taking the photos with an old iPhone 8. I have to do that because the images I get with my iPhone 11 are too large to post on this forum. Im still taking hi resolution photos but I can't post them on this site.

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srankin
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Location: Spencerport, NY USA

Re: 1971 R75/5 Restoration

Post by srankin »

The photos are fine, don't worry.

You mentioned sand blasting? Is this for the frame only or are you talking about the aluminum engine/trans parts as well?

Sand is too coarse for the aluminum engine parts. There have been a lot of discussions as to the proper media to use. I myself use glass bead and even that may not be proper to use.

If I were to replace the material in my blast cabinet and was going to only do engine/trans cases, I would most likely go to walnut shell. Something less abrasive than even the glass beads.

Some folks would even say use chemical strippers to remove paint from aluminum parts. I wish I had listened to them.

On my latest overhaul on one of my bikes, I went mostly with chemical and soda blasting. You can read about it in the tips and techniques section. The soda blasting worked well but, I was lazy and did not strip the engine case down to the bare case. The result was abrasive soda material gummed up inside the engine. I had to tear down to bare case (which I should have done to begin with) to flush the soda out of the nooks ad crannies. I won't ever do that again.

Bottom line with any kind of media blasting, get the part to be cleaned down to as stripped as it can be. Or, tape and plug all openings where you don't want the media to get into. Like me, you don't want an abrasive getting loose in the oil from some nook in the engine case.

I am sure, there will be other who will chime in with other tips and techniques. Have fun. St
Owner of a 84, R80RT and 78, R100RS

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schrader7032
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Location: San Antonio, TX

Re: 1971 R75/5 Restoration

Post by schrader7032 »

skychs wrote:
Tue Nov 17, 2020 6:16 pm
Im still taking hi resolution photos but I can't post them on this site.
There are any number of programs that can easily take a large photo and reduce the resolution or size. Windows has one called Paint. I suspect that Mac does as well. There are websites that will accept your photo and return to you an image of a smaller size.

I know it sounds crazy to have to do something like this in this day and age. But the reasons are 1) the computer screen can only display up to a specific resolution...beyond that, it's just a waste of time to upload; and 2) it can create problems for viewers who have to scroll left/right or up/down to see large pictures.
Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2

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