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Discussion Starter #1
Good morning.

Building out my 91 BMW K75S into a cafe racer that I am falling in love with.

It's been a slow build due to work and owning two Land Rovers... but it's been a lot of fun learning about this bike.

This is my first build out, so there has been a lot of trial and error, and misc parts that I can't return.. but, it's coming out better than I could have imagined.

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Now I'm tackling the wiring of my motogadget motoscope mini, and accessory lights.

Re-lubing the driveshaft spline today and working out how to get my choke to work properly since I've opted to swap out the dated BMW hand controls for a nice set from a Ducati.

Looking forward to getting more progress pics uploaded and hopefully sharing my knowledge with anyone that's going through a similar build.

-Ian
 

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... working out how to get my choke to work properly since I've opted to swap out the dated BMW hand controls for a nice set from a Ducati.
...
-Ian
It's not really a choke it just pulls the throttle on a little bit, should be easy to add something right on the throttle linkage.

... what tires are those and let me know how you like them for wet riding.
 

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Discussion Starter #3 (Edited)
I think I may only put a handful of miles on these tires, I am going to go with Pirelli Angel GT2s once I get the bike on the road.

I just found a solution for the "choke" that will compliment my handle bar setup.

Ordered a Fast idle control from a 2001 Ducati ST4, it will go on next to the left hand controls and give everything a nice tidy look.

Bought a new unit, but the one below gives some insight on the part:
https://www.ebay.com/i/362411912073?chn=ps

Just ordered a slightly smaller headlight, the 7" that I have on now is choking for space, have seen a few other K bikes with a 6.5" that really fits nicely and snug to the forks... should have that in by tomorrow so I can do final wiring to my Motogadget Motoscope Mini and make some custom indicator LEDs for Neutral, & left and right turn signals... then take everything apart up front and paint.

Still haven't decided on the color for the wheels. I am between either Nardo Grey or a black metallic. The tank is a Blue/Black metallic that's from Landrover.

The seat will be painted to match, with a black saddle.. damn it's so close to being done, but so far!
 

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lol just noticed you have ABS, forget about the rear wheel hop recommendation there is nothing you can do about it if it hops. Or are you removing all the ABS?

... you know that early ABS system had so much power requirement they had to fit the bikes with larger batteries to power the pumps :|
 

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Discussion Starter #5
lol just noticed you have ABS, forget about the rear wheel hop recommendation there is nothing you can do about it if it hops. Or are you removing all the ABS?

... you know that early ABS system had so much power requirement they had to fit the bikes with larger batteries to power the pumps :|
Yup,

I've already ditched the ABS system it was massive and not sure it even worked.

Will only be using the center stand w this bike, I am keeping the side stand for emergencies (if the ground isn't flat enough for the center).

Just finished painting and clearing the forks and all the triple trees looks great.

Have oil rubbed bronze paint coming in tomorrow so I can do the wheels and calipers. All paint is finished w 2X clear.

Hoping to reassemble everything by Wednesday/Thurs once the paint cures and I can do a quick wet sanding/polish.

Ordered a 6.5" headlight, because the two 7" headlights I've had just didn't work for clearance, and converting the headlight to LED.

On the fence paying $200 for motogadet endbar turnsignals, but all the others I've tried I've had to return as the build quality has been subpar.

Going to hire a welder to come by and weld up the rear seat loop so I can get that all dialed in and then send the seat off to upholstery.

I'll be on the road in 2-3 weeks, super excited!
 

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i don't think you'll get angel gt2 in sizes to suit

you could put the clip ons on top of the top triple to use up the fork tube sticking up. or just shorten the travel and respring it to suit.
 

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Discussion Starter #8
i don't think you'll get angel gt2 in sizes to suit

you could put the clip ons on top of the top triple to use up the fork tube sticking up. or just shorten the travel and respring it to suit.
You're right on the tires. I am now looking at a Pirelli Sport Demon setup. The reviews are great and it accommodates my wheel setup/size:

Front - 100/90/18
Rear - 130/90/17

At the moment I like the clip ons position with them underneath the top triple and the ride position with the rear sets.

Once I get the bike on the road I will adjust as needed based on long term comfort.
 

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The Sport Demons and Lasertecs are basically the same tire...with different tread patterns. Metzeler and Pirelli are the same company for a long time, now.

I like the Sport Demons on my bike, but I will be trying other tires as I wear these out. So far the tire limit has exceeded the limitations of the chassis on my bike.
 

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If it's not a radial tire, it just doesn't work like a radial tire. That's the only problem with the old model rim sizes, they just don't make the radial tires to fit them and if they do I haven't found them yet.
 

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continental are making radials now in some of these old sizes. they're expensive, but people do like them from what i've read.

i've replaced sport demon with bt45 on a few bikes recently that customers have been much happier with. seems a fairly consistant opinion - i would have expected the sport demon to be a good tyre.
 

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Discussion Starter #13
Good to know about the bt45. I will do more research on them for sure.

Decided to paint my rims today with the Metzeler tires that are currently on. They're in fare condition and will allow me to drive the bike to shake out any cobwebs before I purchase a new set and potentially powdercoat the rims.

Decided on an "oil dipped Bronze" just put 2K clear on and letting them de-gas for 24hrs before I mount up and roll the bike out into sunlight.

This week I should be able to get the bike finished
- Ducati grip mounted - hi-idle speed "choke" on the way
- Front Turn Signals
- Headlight mount
- Still searching for a muffler option
- Resizing the kickstand (interferes with the rearsets)
- Painting the center stand
- Going to powdercoat the rearsets to the color of the rims once I tackle that
- Seat loop/brackets welded in (going to have to find a mobile welder to make a house call)

Excited to get this on the road and some miles in the saddle!
 

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Discussion Starter #14
Had a chance to do some cleaning up as I wait for the last bits.

Decided to try a bronze color on the wheels, and think I am going to land on powder coated nardo grey. The lighter color does so much more for these wheels in my opinion.

Got my motogadget installed in my custom top clamp, adding a few warning LEDs to the headlight once my mounting brackets get in, hid my super loud new horn in the cowl.

Need recos on Exhaust, I almost want a straight pipe w minimal muffling. Thoughts?

So close!

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Need recos on Exhaust, I almost want a straight pipe w minimal muffling. Thoughts?
Yeah, don't be that guy.

Loud pipes suck. They don't sound good, they're just annoying in a "look at me, I'm an attention starved moron" sort of way. The only reason to not run mufflers is ego. The bike will not run better. The bike will not sound better. It will just be loud, which pisses off everyone.

Put a straight through muffler on it that's packed with fiberglass, not something that's just 1/2" larger diameter than the inlet pipe and 3" long. Remove the high frequencies and take the edge off. Everyone will be happier.

If you DO run straight pipes, prepare yourself for the "Sorry about your small dick" comments from people, cuz they are usually a sign you're compensating for something.
 

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imho Bead blast the rims and clear coat them. those rims look awesome just don't stick a leg or arm through there when they are turning.
but then I would be keeping the awesome stock exhaust too. ... the bike is fucking stealth with it on there. Stealth is good unless you like getting tickets.
and for heavens sake put a f'ing front fender on it, put a little rear wheel shield close to the tire too, just like on a real motorcycle.
 

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Discussion Starter #17
Hmmmmm. Triggered. Ok.

Re: the exhaust, I definitely don't want an open system.. this thing is way too loud. What I should have said, does anyone have any recos for a muffler?

The stock sounds great, def that 3 cylinder BMW sound, it's just tooo damn long. I've seen some k100 folks (Ditstang) that have shortened the stocker, but after talking with them they don't recommend this route with the k75.

Re: fenders, I have a couple on order, coming from Europe, hoping one fits the build I am looking for and will be putting something outback once I get a metal fabricator.

Rims are going to powder coating next weekend. Nardo grey will really set this off in my opinion. All that said, I honestly can't wait to get saddle time. And really get this bike buttoned up.
 

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The 4 cylinder understeers a lot, yours is ~20% better but be ready to need to muscle it through the tighter corners or you might find yourself going wide. You won't be doing too many wheelies with it but they do fly nice and level when you are airborne, speed bumps are a hoot if you hit them right. On gravel roads the bias tires don't give you a very confident ride. Fuel economy is very good. The gear indicator is nice, hopefully you can keep that feature or you might occasionally be looking for a 6th. gear. Make your gear shifts very positive, they have a pretty long throw on the shift lever and some have a problem with that if you shift it as if it was a typical Japanese bike it won't work so good.
 

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If you want shorter mufflers, just trim them down and have a new cap welded on. Make sure to have the baffle tube welded to the cap and use decent packing material with metal zip ties.
 

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Buy another stock exhaust from a wrecker, butcher and learn how to weld stainless on the worst one, you might need 2 tries to gat it right.,
Actually can you just shorten the tail end of the header tubes enough?
You can get those at a wreckers too if it suddenly makes performance suck.

Some insides can rust out btw, I replaced my entire rear exhaust once on the K100RS because of that, was big bucks too!
OEM ~800$ circa 1996 if I recall correct.
 
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