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TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => Project Custom Motobricks => Topic started by: MEZ on June 29, 2014, 02:13:58 AM

Title: K75gsa RTW Special
Post by: MEZ on June 29, 2014, 02:13:58 AM
Hi there, I've took the plunge and finally started my project, I'm building a very unique 'one off' K75 GS Adventure bike. Yes, many have been done before me but I'm putting my own twist on things with some very bespoke features. Very pleased to find this forum I have a feeling I will be tapping into the latent wealth of knowledge stored within....!!!!!!

All the best MEZ
Title: Re: K75gsa RTW Special
Post by: jimmyx on July 06, 2014, 06:50:15 PM
Very cool so far Mez!  Love the tank. Did you fab this? Keep posting photos  :popcorm
Jimmy
Title: Re: K75gsa RTW Special
Post by: MEZ on July 10, 2014, 12:49:22 AM
Did I fab this...???? I wish...!! It's nowhere near finished at this stage, there is an auxiliary fuel pod that combines with this tank to give it a mind warping range too, photo's will follow just battling with work demands at mo..!!! Cheers anyway..!
Title: Re: K75gsa RTW Special
Post by: MEZ on August 27, 2014, 06:23:20 PM
Some latest build piccies...!!! Tubes, gadgets etc
Title: Re: K75gsa RTW Special
Post by: MEZ on December 31, 2014, 12:30:20 PM
Driveshaft extended, tank welded, wheels finished..!!
Title: Re: K75gsa RTW Special
Post by: Rightsideup on December 31, 2014, 03:22:54 PM
Looks brilliant so far mez - can you make me one next please?!
Title: Re: K75gsa RTW Special
Post by: MEZ on January 03, 2015, 09:26:50 AM
Mr RSU, yes I have all the vital ingrediants to build a second one complete bar personalisation except a rear wheel !!!!!
Title: Re: K75gsa RTW Special
Post by: MEZ on July 10, 2016, 04:46:12 AM
The project is moving forward now, had it started and running, test ride in next few weeks...!!
Title: Re: K75gsa RTW Special
Post by: MEZ on July 11, 2016, 04:23:51 PM
Stainless steel fuel rail for peace of mind reliability..!! The old steel one became porous after welding......
Title: Re: K75gsa RTW Special
Post by: kennybobby on July 11, 2016, 07:09:57 PM
how do the injectors mount to the rail--will the sharp edge of your spigots cut the orings on insertion?
Title: Re: K75gsa RTW Special
Post by: TimTyler on July 11, 2016, 10:53:12 PM
Looks like a cool project.

If I was putting together a RTW bike I think I'd want it as stock as possible so that it would be easy to swap parts in faraway places.
Title: Re: K75gsa RTW Special
Post by: MEZ on July 12, 2016, 03:35:53 AM
how do the injectors mount to the rail--will the sharp edge of your spigots cut the orings on insertion?

Hi Kenny, there are no sharp edges, it was a perfect fitment, had the injector bellmouths machined by an 'old hand'...!!! I'm chuffed to bits with the outcome, bespoke engineering is only beneficial when it's done correctly especially when your replicating OE bits from companies like BMW, were getting there slowly...!!!
Title: Re: K75gsa RTW Special
Post by: MEZ on July 12, 2016, 03:50:24 AM
Looks like a cool project.

If I was putting together a RTW bike I think I'd want it as stock as possible so that it would be easy to swap parts in faraway places.

Hello Tim, I really wouldn't like to go RTW on a stock K75, I chose the 'k' engine for obvious reasons but as for the rest of the bike a big 'No No', the complexities that come with a special are many but if something is worth doing then just simply do it right, everything on the bike is done with OTT engineering in mind, the concept of the build has changed a little but the end result will be something very unique and bespoke which is what i'm into, once you've had your mind warped by a home made Turbo bike then there really isn't really any other options available to you...!!!
Title: Re: K75gsa RTW Special
Post by: The Dude on July 12, 2016, 05:02:38 AM
Great stuff!
Pod air filter so get more airflow under that fuel tank?
All the best.
Title: Re: K75gsa RTW Special
Post by: MEZ on July 12, 2016, 05:42:10 AM
Great stuff!
Pod air filter so get more airflow under that fuel tank?
All the best.

'Pod Air Filter'...??? I'm new to the 75 so is this an aftermarket air filter..??
I am going to run a K&N gauze filter and have created a fully sealed ram air system scooped directly from the screen down through a large bore pipe through the tank connecting to the airbox again via a pressure fit arrangement. When it rains we have fitted a swivel arrangement that blocks off the air scoop and draws from behind the screen......

All a tad 'MadMax' but heyho...!!!
Title: Re: K75gsa RTW Special
Post by: The Dude on July 12, 2016, 03:28:28 PM
'Pod Air Filter'...??? I'm new to the 75 so is this an aftermarket air filter?
All a tad 'MadMax' but heyho...!!!
Yeah,I recognise mad alright.
There are easy k&n conversions but your ahead of that...just a concern for heat accumulating in the fuel on very hot days."Space"down there would help with flushing that away.All good.
Title: Re: K75gsa RTW Special
Post by: Martin on July 12, 2016, 04:58:52 PM
Interesting conversion, I would be interested to know how much it weighs when your finished. :dunno
Regards Martin.
Title: Re: K75gsa RTW Special
Post by: F14CRAZY on July 12, 2016, 10:53:12 PM
I've thought about K75GS conversions but it seems like 1st gear is too high to be suitable for difficult off road situations like hopping over logs
Title: Re: K75gsa RTW Special
Post by: Martin on July 13, 2016, 02:57:15 AM
I find it a bit hard to visualize a K75 log hopping. Although in the early days I had to follow a couple of G/S's in order to find my way home. A lot of on the peg riding a two rocky creek crossings and a lot of sweating, lucky not to drop it.
Regards Martin.
Title: Re: K75gsa RTW Special
Post by: The Mighty Gryphon on July 14, 2016, 12:13:43 AM
+1 on log hopping.  IMHO K75 off road riding is probably limited to unpaved mostly gravel fire and logging roads.  Beyond that, I suspect you are looking at a LOT of drops and damage per mile.  The bike is too heavy with wheel size and geometry terribly unsuited to rough terrain.  It might be possible to get one over land in a desert, but in the woods I've ridden in, you would spend almost all your time picking it up.
Title: Re: K75gsa RTW Special
Post by: kennybobby on July 14, 2016, 12:09:26 PM
When i saw that bespoke aluminum tank i was very impressed with the welding and design abilities--but then all the bespoke steel bits started showing up front and rear.

Maybe if the bespoke steel tubing was made of bespoke aluminum it could reduce the extra weight.
Title: Re: K75gsa RTW Special
Post by: MEZ on July 14, 2016, 02:21:27 PM
Hi Kenny, you've not said anything remotely positive on this thread and you haven't attempted to answer any questions with worthy answers either, bit odd I find...!! You don't understand what overlanding is all about I feel. Aluminium is fragile in comparison and the gauge tube were using is obviously not as light as alloy but the 'out in the field' advantages of steel out weigh the weight issue. I don't wish to sound abrupt but have you ever built a special before..??

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Title: Re: K75gsa RTW Special
Post by: MEZ on July 15, 2016, 06:00:13 PM
Yeah,I recognise mad alright.
There are easy k&n conversions but your ahead of that...just a concern for heat accumulating in the fuel on very hot days."Space"down there would help with flushing that away.All good.

Yeah the fuel issue, we have fitted a cooler up front that most folk will assume is an oil cooler but guess what.......???? It's a feckin fuel cooler....!!!!!   If you scroll back and see the fuel rail, it has two -6 take off spiggots, one feed and one going off to the fuel cooler before it makes its way to the regulator. I came on this site and beam trawled for K75 issues about two years ago and hopefully have addressed all that can go wrong but then.......!!
Title: Re: K75gsa RTW Special
Post by: MEZ on July 15, 2016, 06:16:14 PM
So today was a milestone, it ran up a treat and I rode it to temperature with no issues, leaks or handling anomalies. Infact I'd like to point out that the handling was the biggest surprise, the seat height is way too high but the front end weight distribution is bang on, no wibble wobble at all, only the usual semi unsurities that TKC80's give on tarmac so dead chuffed with it's first test ride....
Title: Re: K75gsa RTW Special
Post by: MEZ on July 15, 2016, 06:24:33 PM
Two more shots from today.....

Ok. I don't know why the pics are coming up sideways, my apologies....!!!!
Title: Re: K75gsa RTW Special
Post by: Laitch on July 15, 2016, 08:47:11 PM
Ok. I don't know why the pics are coming up sideways, my apologies....!!!!
Try removing the old ones, reorienting new copies and then posting them again.
Title: Re: K75gsa RTW Special
Post by: MEZ on July 16, 2016, 10:00:48 AM
Try removing the old ones, reorienting new copies and then posting them again.

I have tried all 4 orientations and still flippin sideways......Arrrgggghhhh....!!1
Title: Re: K75gsa RTW Special
Post by: Laitch on July 16, 2016, 10:06:51 AM
I have tried all 4 orientations and still flippin sideways......Arrrgggghhhh....!!1
Well, if you're cursed, MEZ, it's a minor one. Please continue posting photos to this informative thread. I'm building a vertical lazy-susan for my monitor to accommodate.
Title: Re: K75gsa RTW Special
Post by: MEZ on October 17, 2016, 11:26:03 PM
Still at it...!!!!
Title: Re: K75gsa RTW Special
Post by: Laitch on October 17, 2016, 11:31:13 PM
What are we looking at here, MEZ? The first one might be equipment from a fish hatchery.
Title: Re: K75gsa RTW Special
Post by: MEZ on October 17, 2016, 11:56:14 PM
Haha..!!! Good observation, sideways AGAIN but what we are looking at is the almost finished auxiliary fuel pod combined electrics box. The conversion from Canbus system '08 GS techno mumbo jumbo to 27year old 'K' electrics meant relay intervention. also in the 'E' box is the variable heat control system for the heated grips and clothing sockets, two remote dashpots sit above the clcks via another auxiliary pod tforon the go ease of access. three 12v power supplies and splitters are in the 'E' box aswell supplying most of the extra gismo's, LED lighting etc etc. The design of the frame tank and front end didn't lend itself to giving a natural place for any extra electrical components so 'Hey Presto' the 'E' box was born...!!!
Title: Re: K75gsa RTW Special
Post by: MEZ on October 18, 2016, 12:06:17 AM
Front end....   Seems whatever I do to the original picture it still goes sideways on me. I believe it's an iPhone thing and whatever or whichever way round you have the phone at the time of taking the shot it stays indemic or loyal to that format maybiz....... I just don't friggin well know....!!






Title: Re: K75gsa RTW Special
Post by: Laitch on October 18, 2016, 09:23:42 AM
Front end....   Seems whatever I do to the original picture it still goes sideways on me. I believe it's an iPhone thing
Your images are not only skewed, MAZ, but are also too darn big. This last one is nominally 45" wide. That size unecessarily takes up server space here. They should be 8" wide or so. That would help them download quicker on everybody's computer., too. Try this app (https://itunes.apple.com/us/app/photo-editor-resizing-rotation/id915790287?mt=8).
Title: Re: K75gsa RTW Special
Post by: thecableguy on October 18, 2016, 09:35:06 AM
Rotated and scaled to 640x480 in GIMP.  Took maybe 3 minutes to download, fix and re-upload. https://www.gimp.org/ (https://www.gimp.org/)
Title: Re: K75gsa RTW Special
Post by: MEZ on October 18, 2016, 11:25:58 AM
Rotated and scaled to 640x480 in GIMP.  Took maybe 3 minutes to download, fix and re-upload. https://www.gimp.org/ (https://www.gimp.org/)


Nice one bud I'll try that link for sure.....
Title: Re: K75gsa RTW Special
Post by: kennybobby on October 18, 2016, 01:21:17 PM
It's looking good and coming along.

How much does it weigh and how much suspension travel is available?
Title: Re: K75gsa RTW Special
Post by: MEZ on October 18, 2016, 04:12:34 PM
It's looking good and coming along.

How much does it weigh and how much suspension travel is available?


Ive had the front and rear suspension programed for a final laden weight the same as my GS with Alf Hagon to the rear and G-force up front, plenty of travel, the one area I have little knowledge about is suspension so I didn't skimp on money or seeking the best resolve....
Title: Re: K75gsa RTW Special
Post by: KJustin on November 05, 2016, 01:40:57 AM
I'm curious about the front end...what forks, triple trees, wheel, brakes, etc., are you using? 
Title: Re: K75gsa RTW Special
Post by: MEZ on November 06, 2016, 12:28:01 PM
Front end..?? headstock has been extended to accept Apprillia Caponord 50mm yolks. Stanchions are KTM 50mm 'extreme's with uprated springs. The wheel is ktm hub, bespoke rim 2.5" and 4mm stainless spokes. Calipar situation isn't fully resolved yet, the braking isn't up to scratch so going to try a four pot or six pot. One-off fork brace CNC'd from 6061 T6.
Title: Re: K75gsa RTW Special
Post by: KJustin on November 07, 2016, 04:24:56 PM
MEZ, thanks for the info.  I suspected that you were doing something highly custom.  Really like your project. 

I'm in the "thinking about it/looking for a donor bike" stage of maybe doing a lighter-duty/less radical version of something like your bike, i.e., mostly really a gravel runner/light duty off-roader.  I don't have nearly your skills, so was looking for something a bit more bolt-on for a front end.

Poking around on-line it looks like some of the R80GS and R100GS guys are putting Suzuki DRZ400 front ends on those bikes and that the trees/yolks are compatible with those airheads (with maybe the addition of a couple of washers).  I think that the K75/100 forks and trees fit those airheads also.  So, I was thinking  a DRZ front end would fit a K75/K100.  It seems very likely that this would require a spring upgrade, though I did see at least one airhead guy say he was happy with stock springs.  Was wondering if you (or anyone else reading this) looked into this at all for the K? 
Title: Re: K75gsa RTW Special
Post by: MEZ on November 08, 2016, 12:16:58 PM
Hello again, re-front end, just about any set of forks can be grafted onto any bike, the main issues are 'offset' , stem length and bearing size. The K75 frame wouldn't entertain the KTM triple clampers I had because they were pure offroad yokes which inherently don't require as much offset and consequently there was zero turning lock almost. If you have a good fabrication guy in mind then you can use a stem from a different bike which will give the length and mate it to a set of yokes which offer sufficient turning angle. Are you going with a 21" front wheel ???
Title: Re: K75gsa RTW Special
Post by: KJustin on November 08, 2016, 07:51:58 PM
MEZ, thanks for the thoughts and comments.  I think you might be giving me too much credit!  I'm thinking about bolt-on with minor modifications like swapping bearings, adding spacers, etc.  The type of fabrication you are doing is (way) beyond my skill set and I don't know of any fabrication guys off hand that could do it.  In terms of offset, wheel size, etc., I'm approaching it from the other direction, that is, see what's reasonably available and within my skill set to do, and then see if it's still a worthwhile project.  Definitely not as exciting as what you are doing.  For now I may just have to live vicariously though your build thread.  Thanks again!
Title: Re: K75gsa RTW Special
Post by: MEZ on March 25, 2017, 02:21:01 PM
Been busy this last week.....!!!
Title: Re: K75gsa RTW Special
Post by: MEZ on December 16, 2018, 09:56:41 AM
It would seem I started this and have two threads running but heyho…... [ Invalid Attachment ]  [ Invalid Attachment ]  [ Invalid Attachment ]  [ Invalid Attachment ]  [ Invalid Attachment ]
Title: Re: K75gsa RTW Special
Post by: duckhawk on December 16, 2018, 11:35:02 AM
Looks great. As a fellow dirt rider, weight is definitely a factor.


 As long as your not doing too much vertical, it should be bomb-proof. I could not fathom doing any "elevated trials type," maneuvers.

Looks like fun! :kato :kato :kato
Title: Re: K75gsa RTW Special
Post by: MEZ on December 16, 2018, 11:52:18 AM
Looks great. As a fellow dirt rider, weight is definitely a factor.


 As long as your not doing too much vertical, it should be bomb-proof. I could not fathom doing any "elevated trials type," maneuvers.



For 'offroad' I have my trusty little Honda, this bike has been designed for comfort and function, I hope to do forest roads, some loose stuff and the occasional riverside camp spot type of terrain bur defo not offroading, I weighed all the bike parts when stripping down and was surprised at the outcome, 290 kg all in, acceptable when you consider all the craftmanship gone into the build...
Title: Re: K75gsa RTW Special
Post by: natalena on December 16, 2018, 01:03:59 PM
Aluminium is fragile in comparison and the gauge tube were using is obviously not as light as alloy but the 'out in the field' advantages of steel out weigh the weight issue.

Really interesting and unique solutions to actual riding issues, Kudu's! I've always wondered about use of splined steel tubing or butted tubes for use on a motorcycle frame, like SLX, etc. Might end up being cost prohibitive, but just think of the weight/strength advantage.
Title: Re: K75gsa RTW Special
Post by: MEZ on March 12, 2019, 08:27:45 PM

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Sorry again gents, can someone refresh me on 3rd party hosting for pics and avoidance of this sideways effect please...????
Title: Re: K75gsa RTW Special
Post by: Laitch on March 12, 2019, 08:57:42 PM
Sorry again gents, can someone refresh me on 3rd party hosting for pics and avoidance of this sideways effect please...????
Go to the Photo Guidance instructions on site and follow them to start your own gallery here. Before you post the photo, there is an option to rotate the photo; just set the number of degrees to rotate it in the appropriate box. 90º or 180º should work for most pics but the entire degree scale is available.

Once you have a gallery here, you can post photos from it to any website by copying and pasting the photo's URL.
Title: Re: K75gsa RTW Special
Post by: MEZ on October 04, 2019, 10:36:24 AM
Update for those interested....  Much progress has been made and trust me ,underneath all that custom fabrication is a BRICK...
Title: Re: K75gsa RTW Special
Post by: MEZ on April 07, 2020, 01:10:26 PM
Been a while, hope all on here are doing good in these uncertain times and coping... Had loads of garage time and hence almost finished my wonderful and amazing 'K' bike project and fingers crossed live too ride it later on this year...!! Take care folks...

Here we go again with scewiff pictures that have a mind of there own....!!!



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Title: Re: K75gsa RTW Special
Post by: volador on April 07, 2020, 02:02:51 PM
WOW that is incredible build you're ready for the apocalypse

can't believe there is a K75 some where inside
dude you got waaaay too much garage time on your hands

What is aluminum standpipe a bug vacuum?
Title: Re: K75gsa RTW Special
Post by: herseyb on April 07, 2020, 05:09:43 PM
this thing is so cool. damn!
Title: Re: K75gsa RTW Special
Post by: johnny on April 07, 2020, 05:46:52 PM
greetings...

its really not a custom if it donts gotts a bep3 motogadget arsewell magasquirt...

j o
Title: Re: K75gsa RTW Special
Post by: herseyb on April 07, 2020, 08:09:19 PM
pshaww!!  the stock gauges MAKE this sucker - ain't broke don't fix it!
Title: Re: K75gsa RTW Special
Post by: The Mighty Gryphon on April 07, 2020, 08:43:36 PM
If there is a rear loop hiding in the back it totally disqualifies that build for uneek creds.  Along with the OEM instruments and the lack of strap-ons it's still just a boring old K75.
Title: Re: K75gsa RTW Special
Post by: MEZ on April 08, 2020, 06:10:19 AM
Haha, bug vacuum could be a bug collector and double up as a ram air high level intake spose....

'Boring K75'..??? Chose this engine for it's durability and smoothness so if that makes it boring so be it... If on a world trip I wanted adrenaline, uncertainness of multiple breakdowns and street cred I would've gone for KTM..!!!

As for the OEM instruments, Flippin love em, cant beat old school clocks and they look very fitting nestled in there...

Cheers gents for some positive comments...
Title: Re: K75gsa RTW Special
Post by: The Mighty Gryphon on April 08, 2020, 09:21:13 AM
If there is a rear loop hiding in the back it totally disqualifies that build for uneek creds.  Along with the OEM instruments and the lack of strap-ons it's still just a boring old K75. Sarc/Off

Fixed it.  Nice build, the concept, design and craftsmanship get the very highest marks. 
Title: Re: K75gsa RTW Special
Post by: herseyb on April 08, 2020, 11:28:09 AM
is that an integral spare fuel container built into the side box?  plumbed to the main tank? removable?
Title: Re: K75gsa RTW Special
Post by: MEZ on April 08, 2020, 01:55:32 PM
is that an integral spare fuel container built into the side box?  plumbed to the main tank? removable?

It is sir, see here : https://advrider.com/f/threads/bmw-k75-gsa.1031519/

The one you can see (left side) is water. The fuel one is on the right, total fuel capacity is approx. 42litres. The auxiliary fuel pod is gravity fed via both jowels of the tank before again gravity takes it to the pump. Custom fuel system still delivers the 35psi at the rail.
Title: Re: K75gsa RTW Special
Post by: MEZ on May 31, 2020, 01:06:34 AM
Gents, Ladies and anyone that claims there from another planet,

Here is my finished bike after doing some road miles. I post because I just wanted to express my love of this bike but particularly the engine. I took on the project using the K75 engine without ever riding one having studied many threads and claims of this engines pure silkiness and robustness and I have to say I whole heartedly agree now. I've had my GSA12 since 2006 and the difference from a boxer engine to this K engine is unbelievable. Not interested in brute power anymore just reliability and smooooothness..!!! Love it...!! [ Invalid Attachment ]
Title: Re: K75gsa RTW Special
Post by: The Mighty Gryphon on May 31, 2020, 08:14:24 AM
What a great looking bike!!! 
Title: Re: K75gsa RTW Special
Post by: Laitch on May 31, 2020, 08:20:48 AM
What's its kerb weight?
Title: Re: K75gsa RTW Special
Post by: herseyb on June 01, 2020, 10:07:19 AM
dang, my dixie wrecked.  don't think i could get harder with pills.   8 stars out of 5.
Title: Re: K75gsa RTW Special
Post by: edgeoftheworld on June 01, 2020, 11:22:51 AM
Damn, I have to say that it is an amazing looking bike!
Title: Re: K75gsa RTW Special
Post by: MEZ on June 09, 2020, 02:09:39 PM
Thank you gents indeed, I actually value the comments from you Brickers more so than the adv community for some reason. Although barring the engine there's precious little left from a donor K bike but it's that engine, the heart of the bike that made me go for and build this special in the first place many moons ago......
Title: Re: K75gsa RTW Special
Post by: Arktasian on June 10, 2020, 09:46:24 AM
Congratulations on your highly modified project. Now you get to become familiar with what you've created (always an interesting process, we do seem to get what we set out to look for).
I believe you have a more finicky "old fart" crowd over on ADV always at the ready to pounce all over something that is slightly different, and they don't have the refined "alien" backing  :alien .
Title: Re: K75gsa RTW Special
Post by: sj2000 on June 10, 2020, 11:10:45 AM
Wow...
Title: Re: K75gsa RTW Special
Post by: Laitch on June 10, 2020, 12:13:56 PM
. . . and they don't have the refined "alien" backing  :alien .
Exactly!  :thisplacewhack
Title: Re: K75gsa RTW Special
Post by: lawtome on June 10, 2020, 04:22:12 PM
That's awesome!
looks like...
"If BMW made KTMs"
 :johnny
Title: Re: K75gsa RTW Special
Post by: MEZ on September 28, 2020, 05:31:00 AM
What's its kerb weight?

Hi Laitch, I got the thing all legal and above board AND onto a weigh bridge, with 20+ litres of fuel onboard it weighed in at 320kg's so dry weight is around 300kg's which is below what I first estimated. It's a heavy weight but I don't care about that, I'm well chuffed at the outcome and looking forward to getting some road miles into Her.....
Title: Re: K75gsa RTW Special
Post by: Laitch on September 28, 2020, 07:37:06 AM
Thanks for the information, MEZ. It'll be an object of wonderment wherever you travel.  112350