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!

My wife still wants your garden...

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

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.

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

K-rider

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. 🙏

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.

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

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

Nor me. 

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

woohoo !!

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.

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

Cheers,

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

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.

Nice!!!!

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

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

marvellous !!

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!


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?" 

 
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.

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.

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.


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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.

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you need that made out of carbon mate.

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

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. 

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 

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.   I'm still in touch with him so a bargain might be had yet!!

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.   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

How are things now?

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.










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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. 

I had some copper gaskets made, perhaps that will help

jdaley wrote:I had some copper gaskets made, perhaps that will help

I'm not sure, copper is very soft.

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

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.