Here we go again!

Well I've made a start on these:

BMW%20K75S%20%28237%29-L.jpg


I've never dealt with aluminium castings in such a bad condition. I had hoped that as the bike had the black finish on the transmission that it would need less work than the bare type.

No such luck. This bike was obviously stored somewhere that was continually damp. The dirt and grease on the black castings has rarely been able to dry and the damp has penetrated the coating and begun turning the aluminium into white dust. Then to make things worse, whoever sold the bike to the owner it was purchased from, had squirted black paint over the crumbling finish. :blast

There's nothing for it, all the coating has to come off and the aluminium stabilised. Start of manually scraping all the old coating off:

BMW%20K75S%20%28242%29-L.jpg


BMW%20K75S%20%28241%29-L.jpg


It's a bit tricky in some corners of the gearbox:

BMW%20K75S%20%28240%29-L.jpg


Not done, work in progress:

BMW%20K75S%20%28244%29-L.jpg


Meanwhile, I can now reveal the chosen new colour, BMW Dakar Yellow (code 267).

This was the same colour as used on the first E36 M3 saloons and it was a K75S colour for at least the North American market, I don't know if it was ever imported into the UK.

photo%20%286%29-XL.jpg


Like this (not everyone will but me and the owner do :))

K75S%20Lt%20Frt%20Angle.jpg


I couldn't resist re-assembling some bits, the graphite K75 badges look much nicer than the chrome or gold ones against the yellow:

BMW%20K75S%20%28248%29-L.jpg


The rear section of the loom has been cleaned and on this model, the ABS loom has to be fed into the seat cubby as that's where the ABS control unit sits on bikes that retain the shorter, non-Paralever, wheelbase:

BMW%20K75S%20%28250%29-L.jpg


It's hell of a fiddly process to get the ABS controller into it's cradle and connected in there:

BMW%20K75S%20%28251%29-L.jpg


These later bikes were made with the variations in mind. The low seat option has a lift-off bench seat as opposed to it being hinged and two lugs are attached to the seat cubby for that purpose. This bike has the holes for the lugs, plugged with plastic pins:

BMW%20K75S%20%28252%29-L.jpg


The cubby cover in place, just waiting for the new under-seat labels:

BMW%20K75S%20%28253%29-L.jpg


BMW%20K75S%20%28254%29-L.jpg


The painted parts that cannot go back on the bike just yet get a coat of Zymol polish, then any re-assembly can be done before being stored out of the way. The re-painted mesh back in the radiator panel:

BMW%20K75S%20%28255%29-L.jpg


As s colour change is involved, rather than leave the insides or undersides showing the original blue and over-spray:

BMW%20K75S%20%28247%29-L.jpg


I'm masking the Dakar Yellow and applying some satin black:

BMW%20K75S%20%28256%29-L.jpg


Then there's a thousand little jobs like cleaning and treating all the bits such as the tank mounting rubbers.

I should be able to get the first coats onto the transmission parts in the next couple of days but first I want to get a new filter into the tank now that it's painted, re-stick the large rubber pad at the rear, put new badges on and the fuel filler cap.
 
Brian, some people are easily impressed. :D

Just removed the masking from the tank:

BMW%20K75S%20%28257%29-L.jpg


Done the filter change (note to Ryan, that's a filter you owe me for stock ;)):

BMW%20K75S%20%28258%29-L.jpg


Then the tank is rested in place to refit the filler cap, the rubber pad and the new badges:

BMW%20K75S%20%28259%29-L.jpg


I was pleased to find that Motorworks re-manufacture the after-market injector cover for these bikes, very reasonably priced too:

BMW%20K75S%20%28261%29-L.jpg


Much more aesthetically pleasing than the injector rail. :thumb2
 
Just remember to put plenty of electrical grease in the coil feed plugs.

I've lost count of the amount of K75 models i've had in with problems with the small clip in plugs badly corroded causing bad running.
The two K100 coils have simple spade terminals.
The three K75 coils have a unique type of plug and socket. :blast
 
Very impressive.

Brian

If you look really closely you might just spot a set of eBolt ;)

Front calliper stainless mounting bolts

And

Four stainless front disc mounting bolts :thumb

Now that's impressive!

(So far two smooth transactions with eBolts by the way!!! :beerjug: Highly recommended !)
 
If you look really closely you might just spot a set of eBolt ;)

Front calliper stainless mounting bolts

And

Four stainless front disc mounting bolts :thumb

Now that's impressive!

(So far two smooth transactions with eBolts by the way!!! :beerjug: Highly recommended !)

Thanks for that, if there is anything else I can help you with give me shout.

Brian:beerjug:
 
do you want to ' borrow ' one of my bikes for a couple of months ?

There's a long queue I'm afraid. :D


Well the first coat went on the swing-arm and final drive a day ago:

BMW%20K75S%20%28265%29-L.jpg


While that was curing I returned to scraping away at the back of the gearbox:

BMW%20K75S%20%28262%29-L.jpg


Then got as far in there as possible by hand with 80 grit paper (the places where I don't want any grit or paint to get into are masked off at this point):

BMW%20K75S%20%28266%29-L.jpg


Once sanded, it's all "washed" in thinners before the underside and rear gets a quick, thin swoosh of paint. At this time of year, with temperatures low, I find that it takes longer for the paint to harden so a lot more time between coats is needed:

BMW%20K75S%20%28270%29-L.jpg


That at least gives me time to set about cleaning other bits. Here the clutch pushrod boot clip, side-stand retractor spring and the small clip that holds the speedometer sensor cable to the swing-arm (the latter is past it and will be replaced with a new one):

BMW%20K75S%20%28268%29-L.jpg


The swing-arm pivot pins and the side-stand retractor arm:

BMW%20K75S%20%28267%29-L.jpg


Cleaned along with the pushrod boot (surprisingly pricey so worth saving), the swing-arm to gearbox rubber gaiter, gearbox and final drive breather caps plus sundry items:

BMW%20K75S%20%28269%29-L.jpg


Meanwhile, the final drive has had its third coat and is moved from the "spray-booth" :rolleyes: to where it can cure fully before a final check of the finish and hopefully de-masking ready for re-assembly:

BMW%20K75S%20%28271%29-L.jpg
 
Superb Mike.

I noticed in an earlier update you 'split' the callipers, I have always been told never to do this as aligning the 2 half's is an issue, as is leakage, have you ever had any problems doing this?
 
Superb Mike.

I noticed in an earlier update you 'split' the callipers, I have always been told never to do this as aligning the 2 half's is an issue, as is leakage, have you ever had any problems doing this?
Never mate. There's only one passage between the two halves and that has a small O-ring to make the seal. As long as it's in good nick, replaced or not pinched, I can't see what the problem could be with these pretty basic Brembos. :nenau
 
Thanks for sharing that Mike.

I always wanted to do it, to replace the shite bolts BMW use for stainless...

:thumb2
 
You don't seem to use an etch primer on the aluminium casings before spraying, any reason why you prefer not too? (Use of one is recommended by Hammerite).
 
You don't seem to use an etch primer on the aluminium casings before spraying, any reason why you prefer not too? (Use of one is recommended by Hammerite).

I've never found it necessary.

If I were applying it to a highly polished or very smooth bare aluminium, I'd probably use it but as the casings are not like that, there's no need to etch the surface.
 
On the topic of paint. After finishing scraping and rubbing down (not ready here), these:

BMW%20K75S%20%28244%29-L.jpg


Now look like this:

BMW%20K75S%20%28279%29-L.jpg


Just awaiting the new stainless filler plugs for the final drive and gearbox:

BMW%20K75S%20%28280%29-L.jpg


The gearbox needs one replacement battery tray bobbin:

BMW%20K75S%20%28281%29-L.jpg


BMW%20K75S%20%28282%29-XL.jpg


Next job, the cam and crank covers. Both have been daubed with a heavy coat of black painted applied with a brush. It was a case of dry sanding with 80 grit paper to remove it in case it reacts with the new paint:

BMW%20K75S%20%28283%29%20-L.jpg


The bike had been down (lightly) on the offside resulting in some gouges on the cover. Those on the paint shouldn't be visible when new paint is applied but the chewed bits of the bare aluminium detailing would be:

BMW%20K75S%20%286%29-L.jpg


A bit of work with a fine file got rid of all but the worst:

BMW%20K75S%20%28284%29%20-L.jpg


Then the detailing had some work with a medium grit Loybloc (the blue one), followed by a final buff with a fine grit one:

BMW%20K75S%20%28285%29%20-L.jpg


Amazing how much comes off both the cover and the Loyblocs:

BMW%20K75S%20%28286%29%20-L.jpg


Then the final rub down is with 400 grit, wet:

BMW%20K75S%20%28287%29%20-L.jpg


It's joined by the cam cover having had the same treatment:

MW%20K75S%20%28288%29-L.jpg


Next step is to mask off the detailing but that will have to wait for later once they are good and dry.
 
What an utterly fascinating thread. So much useful information and tips.

Thank you for posting this Mike :clap

Inspirational or what :bow
 


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