BMW K bikes (Bricks)

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1Back to top Go down   Surface Corrosion Empty Surface Corrosion Wed Jan 05, 2022 8:00 pm

jjefferies

jjefferies
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Being winter here in the Northern Hemisphere, my bikes aren't being ridden as much as I might want. And I just took my Silver K75 for an around the block/island ride to get a bit of lunch. Any excuse to ride anywhere what with Covid, rain, and chill even here in Paradise of S.F. Bay. And before I get started I do acknowledge up front that my riding glasses are tinted red or rose, whatever. One result being that surface rust/corrosion shows more readily. So Looking at the bike I'm seeing all this preliminary surface corrosion on all the shiny metal bolts/fasteners. Red spectacles are wonderful for making the world look rosy and showing up rust. Now in the recent past, my approach has been to take each affected fastener, wire wheel brush it, and then rattle-can spray it with clear coat. This does work to a degree or for a period. But it also seems to allow the corrosion to reform much faster than it did initially. I've also tried fabric wheel polishing the corrosion off which adds a wax coating to the part.

So I'm asking if anyone has a better or more enduring approach to this minor but endemic issue/problem?  What does the factory do to keep the fasteners rust free for the initial years? I do realize that stainless steel is one possibility. But is there a youtube video  of  anti-corrosion coating  fasteners? In my situation - at least - the corrosion is of the head and not the threads/body of the fastener.

    

2Back to top Go down   Surface Corrosion Empty Re: Surface Corrosion Wed Jan 05, 2022 9:47 pm

Point-Seven-five

Point-Seven-five
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I got one of these kits for my K75RT.  Yeah, the kit is for a K100RS, but except for some of the fairing hardware both bikes share about 95% of the same fasteners.

Removing the old fasteners and replacing them with anti-seized stainless took a couple evenings.  Besides looking good, it's nice to know that everything was tightened properly and because of the anti-seize will come out without problems if the need arises.

Since the tensile of the stainless isn't as high as the OEM hardware, I used torque setting on my wrench about 80 or 85% of the specified torque.  After 6 years there have been no issues with broken screws, stripped threads or lost fasteners.


__________________________________________________
Present:
1994 K75RT
1991 K100RS
1988 K100RS SE

Past:
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

3Back to top Go down   Surface Corrosion Empty Re: Surface Corrosion Wed Jan 05, 2022 10:18 pm

jjefferies

jjefferies
Platinum member
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@Point-Seven-five wrote:I got one of these kits for my K75RT.  Yeah, the kit is for a K100RS, but except for some of the fairing hardware both bikes share about 95% of the same fasteners.

Removing the old fasteners and replacing them with anti-seized stainless took a couple evenings.  Besides looking good, it's nice to know that everything was tightened properly and because of the anti-seize will come out without problems if the need arises.

Since the tensile of the stainless isn't as high as the OEM hardware, I used torque setting on my wrench about 80 or 85% of the specified torque.  After 6 years there have been no issues with broken screws, stripped threads or lost fasteners.
Well that beats the price from Motorworks £298.44 INC VAT. And I know that the steel ones are probably way stronger than needed. But I've got three bikes to retrofit and would like to do it in steel. IF possible.
thanks point-seven-five. I'll keep it in mind. Probably a lot easier to change the bolts than any other approach.
Any idea if the set of screws is exact for a K75 as well as the K100?

    

4Back to top Go down   Surface Corrosion Empty Re: Surface Corrosion Wed Jan 05, 2022 11:01 pm

jjefferies

jjefferies
Platinum member
Platinum member
@Point-Seven-five wrote:I got one of these kits for my K75RT.  Yeah, the kit is for a K100RS, but except for some of the fairing hardware both bikes share about 95% of the same fasteners.

Removing the old fasteners and replacing them with anti-seized stainless took a couple evenings.  Besides looking good, it's nice to know that everything was tightened properly and because of the anti-seize will come out without problems if the need arises.

Since the tensile of the stainless isn't as high as the OEM hardware, I used torque setting on my wrench about 80 or 85% of the specified torque.  After 6 years there have been no issues with broken screws, stripped threads or lost fasteners.
2nd go round Point-Seven-five, but looking at the link I wonder which fasteners are included. I don't see the valve covers included. Just the small screws. There are two other ads out there for similar setups. Any comments?
https://www.ebay.com/itm/232225997314?chn=ps&norover=1&mkevt=1&mkrid=711-117182-37290-0&mkcid=2&itemid=232225997314&targetid=1262843334889&device=c&mktype=&googleloc=9031977&poi=&campaignid=15275224983&mkgroupid=131097072938&rlsatarget=pla-1262843334889&abcId=9300697&merchantid=8154984&gclid=Cj0KCQiAoNWOBhCwARIsAAiHnEiVJPKPsLrqrAroSOBpsVt--1T0ZpMZzGOpJup9-PSEs3iPsnovaEEaAq1REALw_wcB

http://www.2040-parts.com/bmw-k1-k100-k1100-k1200-engine-screw-kit-bolt-kit-i791489/

    

5Back to top Go down   Surface Corrosion Empty Re: Surface Corrosion Thu Jan 06, 2022 12:48 am

Point-Seven-five

Point-Seven-five
Life time member
Life time member
If I recall, the kit I linked has all the standard fasteners for the frame, luggage mounts, forks, axle, engine, footpeg plates, helmet lock, mudguards, handlebars, etc.  The special ones that go in the valve and crankshaft covers aren't included as well as a couple others.  I wasn't too concerned about those cover screws because with the RT fairing you can only see about half of them, so I just put the best ones out where I could see them.

With the four bikes that have followed the RT, I have been buying stainless hardware in bulk on eBay.  There are a lot of common sizes used, like M6 & M8 fillister head screws or 6mm wave washers.  I buy them in lots of 20, 50 or 100 and keep a good assortment in a big box, when I'm working on a bike I'll just replace the hardware around where I'm working when I put it back together.  The stainless adds a subtle functional bling to the looks of the bike without being gaudy like chrome stuff.

If you really need to clean up your hardware, I have seen stuff on YouTube about electrolytically removing rust and replating with nickel or zinc.



Last edited by Point-Seven-five on Thu Jan 06, 2022 11:39 am; edited 2 times in total


__________________________________________________
Present:
1994 K75RT
1991 K100RS
1988 K100RS SE

Past:
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

6Back to top Go down   Surface Corrosion Empty Re: Surface Corrosion Thu Jan 06, 2022 6:46 am

Dai

Dai
Life time member
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As per .75, all the fasteners on LFB (except for the specialist ones e.g. cam cover) have been replaced with stainless. I also buy in bulk; multiple bikes plus working on others. I never buy bike-specific kits because 11 times out of 10 the price is a x3 or x4 ripoff from buying even individual bolts. As for the Motorworks kit: lathe-turned and polished is very pricey but means no manufacturer's stamps on them.

That second kit you link to specifically does NOT include the cam/crankshaft cover bolts (very last line in the ad).


__________________________________________________
1983 K100 upgraded to K100RS spec, 1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

7Back to top Go down   Surface Corrosion Empty Re: Surface Corrosion Thu Jan 06, 2022 10:16 pm

jjefferies

jjefferies
Platinum member
Platinum member
Interestingly none of the kits seem to include the  frame to tranny bolts or the bolts for the tail section, or bag mounts. And they both claim 94 pieces.

Given that do you think this makes a cost effective approach to replacing the steel with stainless?

Ok, just caught that two of the three kits are by the same folks, the 352-piece kit ($60), and one of the 94 piece ($45) kits.

    

8Back to top Go down   Surface Corrosion Empty Re: Surface Corrosion Thu Jan 06, 2022 11:18 pm

Laitch

Laitch
Life time member
Life time member
The 2040-parts.com link in Reply #4 leads us to a mysterious source that displays an American flag, a location in Houston, TX and a map of North Miami Beach with place names in Russian translated into English. Try them first.  Surface Corrosion 112350


__________________________________________________
1995 K75 81,000 miles
Surface Corrosion Usa-lo10
    

9Back to top Go down   Surface Corrosion Empty Re: Surface Corrosion Fri Jan 07, 2022 12:08 am

Point-Seven-five

Point-Seven-five
Life time member
Life time member
The $60 kit that I linked has hardware for a lot of esoteric parts(think screws for attaching the handlebar switches and the helmet lock). There weren't many fasteners that they didn't have, if any.   I'm pretty sure that it includes hardware for the panniers.  I'm not sure, but I think there was no replacement for the engine mount hardware or the rear shock.  Those was two of the things they didn't replace, and I wouldn't have used them anyway.  I would much rather have the factory bolts in those applications.


__________________________________________________
Present:
1994 K75RT
1991 K100RS
1988 K100RS SE

Past:
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

10Back to top Go down   Surface Corrosion Empty Re: Surface Corrosion Fri Jan 07, 2022 3:21 am

jjefferies

jjefferies
Platinum member
Platinum member
@Laitch wrote:The 2040-parts.com link in Reply #4 leads us to a mysterious source that displays an American flag, a location in Houston, TX and a map of North Miami Beach with place names in Russian translated into English. Try them first.  Surface Corrosion 112350
That is just TOO much. I'm thinking to go with the $60 kit. Wink  Less chancy?

Thanks .75. Just put the order in.

    

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