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151Back to top Go down   JJ Cobas K100R Flying Brick - Page 4 Empty Re: JJ Cobas K100R Flying Brick on Wed Jun 01, 2016 2:15 pm

Dai


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@Motorbike Mike wrote:On the plus side I brought home lots of 20mm gravel in the belly pan and on top of the engine that I'll put at the side of the house!
JJ Cobas K100R Flying Brick - Page 4 44271 My wife still wants your garden... Very Happy

    

152Back to top Go down   JJ Cobas K100R Flying Brick - Page 4 Empty Re: JJ Cobas K100R Flying Brick on Wed Jun 01, 2016 2:22 pm

Motorbike Mike

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She's welcome to it but I'm taking the gravel! Very Happy

    

153Back to top Go down   JJ Cobas K100R Flying Brick - Page 4 Empty Re: JJ Cobas K100R Flying Brick on Fri Jun 17, 2016 12:31 pm

Motorbike Mike

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I had these 4 pad Brembo calipers in mind for my bike and as I seem to have time, I decided to fit them before I went off to Spa.
I've used dural plate as it's very strong and made the simplest mounts possible with 10mm spacers that I will weld onto the back of the mount. I'm waiting for a set of Titanium nuts and bolts to arrive to keep unsprung weight down but let me tell you that low weight costs. £56 for 8 bolts, 1 nut (I had 3 in stock) and washers to suit!!
Here's a before and after and the almost finished article.
JJ Cobas K100R Flying Brick - Page 4 Cimg3414

JJ Cobas K100R Flying Brick - Page 4 Cimg3415

JJ Cobas K100R Flying Brick - Page 4 Cimg3413

    

154Back to top Go down   JJ Cobas K100R Flying Brick - Page 4 Empty Re: JJ Cobas K100R Flying Brick on Sat Jun 18, 2016 2:19 pm

k-rider

k-rider
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Looks great,, but is that stiff enough to awoid flexing when braking Hard at the end of A fast straight? 

K-rider


155Back to top Go down   JJ Cobas K100R Flying Brick - Page 4 Empty Re: JJ Cobas K100R Flying Brick on Sat Jun 18, 2016 7:02 pm

Motorbike Mike

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I would think so because all the forces are pushing forward and not from the side. If it needs to be stiffer I can use 10mm plate but I'm confident that it's up to the job. 🙏

    

156Back to top Go down   JJ Cobas K100R Flying Brick - Page 4 Empty Re: JJ Cobas K100R Flying Brick on Sat Jun 25, 2016 7:10 am

Motorbike Mike

Motorbike Mike
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I'd been thinking for some time that the bike needed a catch tank. I'd looked a some on eBay but they were for cars and too big. I also considered using an aluminium drinks bottle but no.
The only thing for it was to make my own to the spec the bike needed and here it is rubber mounted on top of the gearbox.

JJ Cobas K100R Flying Brick - Page 4 Cimg3418

JJ Cobas K100R Flying Brick - Page 4 Cimg3421

JJ Cobas K100R Flying Brick - Page 4 Cimg3422

JJ Cobas K100R Flying Brick - Page 4 Cimg3423



Last edited by Motorbike Mike on Sat Jun 25, 2016 7:48 am; edited 1 time in total

    

157Back to top Go down   JJ Cobas K100R Flying Brick - Page 4 Empty Re: JJ Cobas K100R Flying Brick on Sat Jun 25, 2016 7:37 am

Motorbike Mike

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More air too. I added a third pipe to the airbox.

JJ Cobas K100R Flying Brick - Page 4 Cimg3425

JJ Cobas K100R Flying Brick - Page 4 Cimg3424

    

158Back to top Go down   JJ Cobas K100R Flying Brick - Page 4 Empty Re: JJ Cobas K100R Flying Brick on Sat Jun 25, 2016 2:32 pm

Dai

Dai
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(Insert joke about deep breaths) because I'm dammed if I can think of one!!!! Very Happy Very Happy


__________________________________________________
'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

159Back to top Go down   JJ Cobas K100R Flying Brick - Page 4 Empty Re: JJ Cobas K100R Flying Brick on Sun Jun 26, 2016 4:34 am

Motorbike Mike

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Nor me.  Smile

    

160Back to top Go down   JJ Cobas K100R Flying Brick - Page 4 Empty Re: JJ Cobas K100R Flying Brick on Mon Jun 27, 2016 5:06 pm

Motorbike Mike

Motorbike Mike
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Finished and ready to load into the trailer and it's off to Spa. Matching helmet too.

JJ Cobas K100R Flying Brick - Page 4 Cimg3426

    

161Back to top Go down   JJ Cobas K100R Flying Brick - Page 4 Empty Re: JJ Cobas K100R Flying Brick on Mon Jun 27, 2016 5:36 pm

charlie99

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woohoo !!


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OJJ Cobas K100R Flying Brick - Page 4 Au-log10

"redframe" rs "bitsa"  with many contributions from the k100 community ,,with many thanks
    

162Back to top Go down   JJ Cobas K100R Flying Brick - Page 4 Empty Re: JJ Cobas K100R Flying Brick on Mon Jun 27, 2016 8:46 pm

RicK G

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All the best for the meeting Mike. I always say that winning happens when good preparation and good luck meet and I don't doubt your commitment to preparation so all thats needed now is some luck for you to take the advantage.


__________________________________________________
"Every normal man must be tempted, at times, to spit upon his hands, hoist the black flag, and begin slitting throats."  from Mencken's 1919 Prejudices

Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

163Back to top Go down   JJ Cobas K100R Flying Brick - Page 4 Empty Re: JJ Cobas K100R Flying Brick on Mon Jun 27, 2016 11:56 pm

dee why

dee why
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Love this thread Mike. Mammoth effort.
Good luck and enjoy your time at Spa.

Cheers,


__________________________________________________
Dee Why

04/86 K100 VIN 0009479 Columbia Silver
    

164Back to top Go down   JJ Cobas K100R Flying Brick - Page 4 Empty Re: JJ Cobas K100R Flying Brick on Tue Jun 28, 2016 4:27 am

Motorbike Mike

Motorbike Mike
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Thanks guys.
As much as riding, I'm looking forward to the classic bike endurance race. It's a real eye opener watching the riders at night-they're so fast.

I'll report back soon.
Meanwhile, enjoy th



    

165Back to top Go down   JJ Cobas K100R Flying Brick - Page 4 Empty Re: JJ Cobas K100R Flying Brick on Tue Jul 05, 2016 2:39 pm

Motorbike Mike

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A few pics from Spa last weekend. The K went great and was quicker that expected.
The biggest compliment was from a Dutch ex-racer who raced against he bike in some endurance events back in the day-he thought it was an actual Cobas K100R. I was very flattered.

JJ Cobas K100R Flying Brick - Page 4 Img_3214

JJ Cobas K100R Flying Brick - Page 4 Img_3212

JJ Cobas K100R Flying Brick - Page 4 Img_1812

JJ Cobas K100R Flying Brick - Page 4 Img_1810

JJ Cobas K100R Flying Brick - Page 4 Img_1811

    

166Back to top Go down   JJ Cobas K100R Flying Brick - Page 4 Empty Re: JJ Cobas K100R Flying Brick on Tue Jul 05, 2016 3:38 pm

Dai

Dai
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Nice!!!! Very Happy


__________________________________________________
'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

167Back to top Go down   JJ Cobas K100R Flying Brick - Page 4 Empty Re: JJ Cobas K100R Flying Brick on Wed Jul 06, 2016 7:09 am

dee why

dee why
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Thanks for posting Mike.
That fairing seems to trim the look of the K right down. Very tidy indeed.
Good to see rider and bike home safe and sound.

Dee


__________________________________________________
Dee Why

04/86 K100 VIN 0009479 Columbia Silver
    

168Back to top Go down   JJ Cobas K100R Flying Brick - Page 4 Empty Re: JJ Cobas K100R Flying Brick on Wed Jul 06, 2016 9:43 am

Motorbike Mike

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Thanks Dee,
It makes a change not to crash it!  affraid

    

169Back to top Go down   JJ Cobas K100R Flying Brick - Page 4 Empty Re: JJ Cobas K100R Flying Brick on Thu Jul 07, 2016 5:53 am

charlie99

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marvellous !!


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OJJ Cobas K100R Flying Brick - Page 4 Au-log10

"redframe" rs "bitsa"  with many contributions from the k100 community ,,with many thanks
    

Motorbike Mike

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Fixes first; I've been victim to mysterious, annoying and on track downright dangerous cut out issue. I've changed the Hall sensors first because it seemed to happen when the bike got hot, I thought I'd got it sorted but no. The problem persisted so I tried all plugs and connections, it seemed OK for a while and then it's cutting out again. I then looked at all the earthing points and wires including sending extra earths out from the negative terminal on the LiPo battery, Again all was well for a couple of laps and then a major cut out on a long fast bend and I was expecting to get tail ended and was very relieved to be safe. While trundling along on a dead engine about to pull off the track I reached for the small loom that goes from the ECU to the coils/injectors and the motor came back into life-obviously (now) a broken wire. 
As a quick fix I cable tied the loom at 1" intervals and the bike was OK for the rest of the day. I got home and fitted a '96 loom and ECU and it's now sorted.

The quick fix!
JJ Cobas K100R Flying Brick - Page 4 Cimg3217

I've had a set of K1200RS throttle bodies that I've been meaning to fit for ages and while changing looms I though "why not?" 
JJ Cobas K100R Flying Brick - Page 4 Cimg3211
 
The centres are the same as is the TPS as the 1100 items. No air bleed screws on these because idle speed is controlled by a servo motor in turn from the 1200's ECU. There is a butterfly stop screw so I wound it right in and went ahead anyway. I had to make another throttle cable but it's a fairly easy job.
I dropped the tank on and and went for a start. I pressed the button and wound the throttle open slightly (no fast idle lever) and the bike fired straight away and settled to a 25600rpm tick-over so I shut it down and adjusted the stop screw. It's now down to a silky smoooth 1050rpm. The motor picks up really quick and I'm looking forward to my next ride.

JJ Cobas K100R Flying Brick - Page 4 Cimg3212

JJ Cobas K100R Flying Brick - Page 4 Cimg3213



Last edited by Motorbike Mike on Sat Jul 23, 2016 9:12 am; edited 1 time in total

    

171Back to top Go down   JJ Cobas K100R Flying Brick - Page 4 Empty Re: JJ Cobas K100R Flying Brick on Fri Jul 22, 2016 4:49 am

K75cster

K75cster
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I just love reading this stuff. Good luck on the next outing, I'm hoping the 12TB's give you good ground on the others out there.


__________________________________________________
Keith - 1987 K75c with r100rt replica fairing and half of a 1984 K100rt 1992 K1100LT a blue one

The Clever are adept at extricating themselves from situations that the wise would have avoided from the outset - QUOTE from david Hillel in Out of the Earth.
    

172Back to top Go down   JJ Cobas K100R Flying Brick - Page 4 Empty Re: JJ Cobas K100R Flying Brick on Sun Jul 24, 2016 4:46 am

Motorbike Mike

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I shall make a larger airbox over the winter but I wanted a larger air intake as the 3 smaller tubes were prone to splitting due to high frequency vibes. I had to make a new inlet to fit onto the side of the airbox.


Enlarge this image
JJ Cobas K100R Flying Brick - Page 4 Cimg3214


Enlarge this image
JJ Cobas K100R Flying Brick - Page 4 Cimg3215


Enlarge this image
JJ Cobas K100R Flying Brick - Page 4 Cimg3216

I've used 80mm aluminium flexible ducting that I've had to flatten to get it into the bodywork.
The ducting tape is just to stop the tube rubbing on the inside of the fairing.

Enlarge this image
JJ Cobas K100R Flying Brick - Page 4 Cimg3218


Enlarge this image
JJ Cobas K100R Flying Brick - Page 4 Cimg3219

    

173Back to top Go down   JJ Cobas K100R Flying Brick - Page 4 Empty Re: JJ Cobas K100R Flying Brick on Mon Jul 25, 2016 10:38 am

riddle the sphinx

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@Motorbike Mike wrote:I shall make a larger airbox over the winter but I wanted a larger air intake as the 3 smaller tubes were prone to splitting due to high frequency vibes. I had to make a new inlet to fit onto the side of the airbox.


Enlarge this image
JJ Cobas K100R Flying Brick - Page 4 Cimg3214


Enlarge this image
JJ Cobas K100R Flying Brick - Page 4 Cimg3215


Enlarge this image
JJ Cobas K100R Flying Brick - Page 4 Cimg3216

I've used 80mm aluminium flexible ducting that I've had to flatten to get it into the bodywork.
The ducting tape is just to stop the tube rubbing on the inside of the fairing.

Enlarge this image
JJ Cobas K100R Flying Brick - Page 4 Cimg3218


Enlarge this image
JJ Cobas K100R Flying Brick - Page 4 Cimg3219

you need that made out of carbon mate.


__________________________________________________
'88 naked K100RT
    

174Back to top Go down   JJ Cobas K100R Flying Brick - Page 4 Empty Re: JJ Cobas K100R Flying Brick on Mon Jul 25, 2016 11:51 am

Motorbike Mike

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Let me know when you're ready and I'll send you a pattern!

    

175Back to top Go down   JJ Cobas K100R Flying Brick - Page 4 Empty Re: JJ Cobas K100R Flying Brick on Fri Sep 02, 2016 11:36 am

Guest

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@Motorbike Mike wrote:I met a chap last year at Spa who said that he had a Bakker frame but he wouldn't part with it. 
I tried really hard to buy it but I couldn't even get him round to discussing money. I'm happy enough with the bikes handling, it doesn't misbehave at track speeds so it would be just another expensive folly. 

That's all B.S! I'm sure if a frame presented itself my I'd off to the bank to make a withdrawal. Very Happy
hi mike just been reading all this goings on and sure the guy with the 2 cobas bikes has his nose in a sling over replicas, and the guy at spa with the bakker frame but if your quick and slightly well heeled give BRUNE a ring in der farter land or even check it out on ebay.de as they had 2 now i think 1 complete frame, tank, seat, twin lights fairing , and a few sundry items , ie ; headlights and mounting brackets for a brune k100rs 16v donor  as you will be aware they were commissioned  by them for georges martin of MOTO-MARTIN fame  but again not cheap like around 6-7000 euros  but where else can you get one cheers interesting reading cheers  woodcutter JJ Cobas K100R Flying Brick - Page 4 447221

    

176Back to top Go down   JJ Cobas K100R Flying Brick - Page 4 Empty Re: JJ Cobas K100R Flying Brick on Mon Sep 05, 2016 12:15 pm

Motorbike Mike

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Hi, thanks for the nod on the frame.
I'd seen them up for sale at very reasonable money but fuel tanks etc are a fortune. I met a chap that lives not far from me who'd bought one of the frames without checking the price of the rest of the necessaries. Consequently he can't afford to even start the build. Shocked  I'm still in touch with him so a bargain might be had yet!!

    

177Back to top Go down   JJ Cobas K100R Flying Brick - Page 4 Empty Re: JJ Cobas K100R Flying Brick on Mon Sep 05, 2016 8:50 pm

Guest

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@Motorbike Mike wrote:Hi, thanks for the nod on the frame.
I'd seen them up for sale at very reasonable money but fuel tanks etc are a fortune. I met a chap that lives not far from me who'd bought one of the frames without checking the price of the rest of the necessaries. Consequently he can't afford to even start the build. Shocked  I'm still in touch with him so a bargain might be had yet!!
hi mike yep the whole kit is expensive i spoke to georges martin personally and he wont make anymore frames and ancillary bits keeps referring me to BRUNE gmhb and they have a complete kit left frame,tank,seat, fairing, headlights , headlight mounts, etc etc but as i said  6000-7000 euros  how would you be going to someone like harris or spondon to construct a light weight chassis similar to the moto martin or bakker, or cobas frame  theres plenty of good talented tank makers in england as well , ah well its all food for thought  time for a cuppa tea [ got some nice yorkshire gold tea bags here ] go onto ebay.de and search bmw moto martin check it out   cheers mike and keep the updates on the brick coming   regards steve

    

178Back to top Go down   JJ Cobas K100R Flying Brick - Page 4 Empty Re: JJ Cobas K100R Flying Brick on Sat Feb 02, 2019 9:33 am

jdaley

jdaley
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How are things now?


__________________________________________________
John Daley
Bendigo, Asutralia
    

179Back to top Go down   JJ Cobas K100R Flying Brick - Page 4 Empty Re: JJ Cobas K100R Flying Brick on Sat Feb 02, 2019 11:52 am

Motorbike Mike

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@jdaley wrote:How are things now?
All good thanks.
The head gasket destroyed itself between the cylinders and obviously lost power. I took the opertunity to give the head and ports a good going over and it's made quite a difference.

JJ Cobas K100R Flying Brick - Page 4 Img_4116
JJ Cobas K100R Flying Brick - Page 4 Img_4118
JJ Cobas K100R Flying Brick - Page 4 Img_4117

JJ Cobas K100R Flying Brick - Page 4 Cimg4011
JJ Cobas K100R Flying Brick - Page 4 Cimg4012
JJ Cobas K100R Flying Brick - Page 4 Cimg4013
JJ Cobas K100R Flying Brick - Page 4 Cimg4015
JJ Cobas K100R Flying Brick - Page 4 Cimg4014
JJ Cobas K100R Flying Brick - Page 4 Img_4110[/urr
JJ Cobas K100R Flying Brick - Page 4 Img_4114

Unfortunately I don't have pictures of the finished ports, I've no idea where they went to but here are some images mid-job. The amount of carbon on the vavles is unbelievable. The ports were the same-there's no wonder it goes much well now.
I know some tuners take then back to the port wall left but I left the valve guides intack because I'd like the engine to last more than 10 minutes.  Very Happy

    

180Back to top Go down   JJ Cobas K100R Flying Brick - Page 4 Empty Re: JJ Cobas K100R Flying Brick on Sat Feb 02, 2019 8:53 pm

jdaley

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I had some copper gaskets made, perhaps that will help


__________________________________________________
John Daley
Bendigo, Asutralia
    

181Back to top Go down   JJ Cobas K100R Flying Brick - Page 4 Empty Re: JJ Cobas K100R Flying Brick on Sun Feb 03, 2019 9:32 am

Motorbike Mike

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@jdaley wrote:I had some copper gaskets made, perhaps that will help
I'm not sure, copper is very soft.

    

182Back to top Go down   JJ Cobas K100R Flying Brick - Page 4 Empty Re: JJ Cobas K100R Flying Brick on Sun Feb 03, 2019 7:31 pm

RicK G

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Copper is very good for head gaskets I used it for many years on the Kawasaki when I was racing. Just anneal it and use it again and again


__________________________________________________
"Every normal man must be tempted, at times, to spit upon his hands, hoist the black flag, and begin slitting throats."  from Mencken's 1919 Prejudices

Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

183Back to top Go down   JJ Cobas K100R Flying Brick - Page 4 Empty Re: JJ Cobas K100R Flying Brick on Sun Feb 03, 2019 8:00 pm

Motorbike Mike

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Have you noticed that there’s almost nothing between the cylinders?
Stainless steel has burned away so I don’t think copper would fair any better and as a time served plumber I understand that in the correct application copper is a superb material. Besides, I didn’t have a copper gasket to hand and it’s back together and fine now.

    

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