Author Topic: Enjoying the past  (Read 14881 times)

Offline jllphan

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Enjoying the past
« on: April 08, 2016, 10:41:33 PM »
This chapter of my life ramped up last fall with a trip to my girlfriend's dad's house last Thanksgiving.  She grew up with a motorcycle father and was riding pretty much from birth.  I rode in my 20's but hadn't in a long time after my love affair with BMW cars took hold and occupied my resources full time for the past 20 years.  But back to my roadtrip home w/ my gf.  To say her dad is a motorcycle guy is a bit of an understatement.  Eventhough he raised four girls (by himself), they all rode. To give you an idea, this is in the middle of the driveway...



And with an overwhelming number of options, I spent the weekend on his 1000RR, GS, KTM dirt bikes and an RD350 i particularly fell in love with.  I left wondering why i didn't have a bike and decided to remedy that.  I'm a dyed in the wool BMW guy so anything else was unthinkable.  After some reading the K75 seemed like a great option to help me discover what I wanted out of motorcycle.  So the hunt was on and after a few months of research and casual looking I landed on a '91 K75 w/ just 14k on the clock.



It hadn't been ridin' much over the past 3-4yr but was super clean and from an honest dude. Honestly, it was set up nicely and well equipped to go places.  The image above was without the included tragkorbs, but with those, the windshield, handlebars and seat back it was ready to hit the road, but I couldn't leave well enough alone.  And while I love the look of the cafe racer, I realized that seemed like a silly thing to do to a K bike after spending a few weeks riding it.  By definition, the cafe bikes are small displacement low slung bikes built to make short feverish runs.  This is NOT that kinda bike.  It does however seem made to tour and at some point I hope to do that.  But for now, my vision: a poor man's RnineT. 

But before I could start on the aesthetics, i had to make sure all the mechanicals were in good nick.  I started with:
-oil/filter change
-air filter
-breather hose
-spark plugs
-final drive oil
-transmission oil
-fuel filter
-pulled the tranny-back and lubed all splines
-rebuilt the rear brake calliper and flushed font/rear brake fluid



at that point i felt comfortable enough to work on the aesthetics and make the bike "mine."  so i started by shedding the seat back and windscreen and adding some bar end mirrors and an LED headlight to improve the vision a bit







the bar end mirrors didn't really work so i added some mirrors from an RnineT, added S bars and a new set of Michelins



and that's where it sits as of now.  i'm just enjoying it how it is, but have lots more plans.  It didn't take long to realize one bike wasn't going to be enough, so scooped up a 1975 R90/6 with just 22k



after a couple weeks of work both cosmetically and mechanically, this is where I'm at



While I feel a need to preserve the originality of the bike, I realize they made a ton of these, it's nothing special and my love for cafe bikes still lives.  I may move in that direction with this one.

All that to say, I'm now a BMW motorcycle guy as much as I am a BMW car guy.  While I've logged my first 1k miles with the K bike and only a fraction of that with the airhead, i can completely appreciate the engineering that went into both bikes and plan to preserve both of them to the best of my ability. 

I also don't think it will stop there -- much more to come.
  • Nashville
  • 1991 K75 | 1975 R90/6

Offline Scud

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Re: Enjoying the past
« Reply #1 on: April 08, 2016, 10:51:49 PM »
Nice pair of bikes.  :bmwsmile

And nice bit of prep work on them too. I particularly like the bongo wheel stand.  :2thumbup:

Now go ride the crap out of that K75. With such low miles, it's got a lot of catching up to do.



  • Carlsbad, CA
  • 1992 K75s. 2002 Moto Guzzi V11 Scura, 2003 Moto Guzzi V11 LeMans. 2007 Husqvarna TE450

Offline Chaos

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Re: Enjoying the past
« Reply #2 on: April 09, 2016, 12:02:52 AM »
BMW makes cars?
  • sw ohio
1987 K75S    VIN 0231
Original owner, Original litter
200,000 miles (plus or minus) and 5 paint jobs
sold 6/23
2023 Ural 2WD sidecar (BMW's bastard step child)

Offline K1300S

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Re: Enjoying the past
« Reply #3 on: April 09, 2016, 07:30:44 AM »
welcome to the "six wheel" bmw club!  I have had dozens of 4 wheel bmw's and last year added the two wheel variety.

interesting that you liked the RD350.  my first bike way back in the day was an RD 250.

current 4 wheel stable
75 BMW M2
97 BMW M3
02 BMW 325it
15 BMW X3
various BMW E30 race cars
Project Thread "K75s Midlife Refresh"
http://www.motobrick.com/index.php/topic,7810.0.html

Offline Brad-Man

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Re: Enjoying the past
« Reply #4 on: April 09, 2016, 08:25:10 AM »
Quote from: mlytle link=topic=8134.msg60575#msg6057
interesting that you liked the RD350.  my first bike way back in the day was an RD 25
[/quote

My 1st bike was a new '75 RD350. That one was totalled by a new '75 Lincoln town car and as I was in school and starting a family I decided to take some time off from bikes.

35 years later (kids out of college and entering 323rd childhood) I bought another '75 that turned into a ground up project that will be extensively modified.

Wanting to get back to riding I found a '74 that only needed extensive clean up to get on the road, so now I have 2 of them.

I missed an opportunity to get an '85 naked K100 in pieces that had a newly powdercoated frame, but kept my eyes open and bought an '85 K100RS sans fairings for 950 and have only had to put a batter and (upgraded) alternator on it.

I've really enjoyed both running bikes but really appreciate the nearly double the range on a tank of gas K along with the ability to take the better half along.  (I'm 250 and she's 5'7" and 135).

Welcome aboard and I hope you too eventually get an RD!
  • Marietta, GA
  • '85 K100
Toys don't make the Man - Man makes the Toys...
'74 RD350
'75 RD350 w/Modified 400 engine, Chambers & MZB iggy

Offline jllphan

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Re: Enjoying the past
« Reply #5 on: April 24, 2016, 12:14:17 PM »
welcome to the "six wheel" bmw club!  I have had dozens of 4 wheel bmw's and last year added the two wheel variety.

interesting that you liked the RD350.  my first bike way back in the day was an RD 250.

current 4 wheel stable
75 BMW M2
97 BMW M3
02 BMW 325it
15 BMW X3
various BMW E30 race cars

That's awesome, the newest BMW i have is a 2001, I have more e30's than anything, buti really dig most their cars from 72'-'06.  What is a '75 M2?
  • Nashville
  • 1991 K75 | 1975 R90/6

Offline jllphan

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Re: Enjoying the past
« Reply #6 on: April 24, 2016, 12:20:40 PM »
Quote from: mlytle link=topic=8134.msg60575#msg6057
interesting that you liked the RD350.  my first bike way back in the day was an RD 25
[/quote

My 1st bike was a new '75 RD350. That one was totalled by a new '75 Lincoln town car and as I was in school and starting a family I decided to take some time off from bikes.

35 years later (kids out of college and entering 323rd childhood) I bought another '75 that turned into a ground up project that will be extensively modified.

Wanting to get back to riding I found a '74 that only needed extensive clean up to get on the road, so now I have 2 of them.

I missed an opportunity to get an '85 naked K100 in pieces that had a newly powdercoated frame, but kept my eyes open and bought an '85 K100RS sans fairings for 950 and have only had to put a batter and (upgraded) alternator on it.

I've really enjoyed both running bikes but really appreciate the nearly double the range on a tank of gas K along with the ability to take the better half along.  (I'm 250 and she's 5'7" and 135).

Welcome aboard and I hope you too eventually get an RD!

No doubt -- to be honest, that's the first 2 stroke street bike I've ever ridden and was just blown away with the power of such a small bike.  I can see myself owning one after the R90 teaches me a bit on how to work on older bikes.  I can only imagine an old 2 stroke being a bit needy w/ regards to periodic tuning.  But then again, we just rolled the ole RD out of the garage, blew the dust out of it and it fired right up. 

Here's a pic of it:
  • Nashville
  • 1991 K75 | 1975 R90/6

Offline jllphan

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Re: Enjoying the past
« Reply #7 on: April 24, 2016, 12:37:46 PM »
I had a good day of result yesterday.  After adding "S" bars, the brake line was too long and front brake performance suffered as a result.  After fitting that I bled the heck out of the brakes to get the desired handle feel.  I have to say, I'd like a bit more resistance, but perhaps I just need to replace the other lines or upgrade to braided lines to get a firmer handle. 

I then moved on to diagnose why the cooling fan wasn't coming on.  A few days ago (the only warm day I've ridden the bike so far), I got stuck in traffic and after about 10 minutes of stop and go my coolant light came on.  So I quickly got on to some back roads to cool off and ordered some parts in advance to cover the usual suspects to diagnose over the weekend.  Thanks to this great article by Jeff Dunkle it was cake.  Upon testing the fan by bypassing the switch, it indicated the fan motor was done.  So i hooked it up to a direct 12v source and nothing.  Suspecting that might the case, I had ordered a new fan motor from beemerboneyard and swapped it out.  While i was in there, i confirmed the light was operating as it should as well as the normal resistance across the probe. 

As this was the first time I've had the tank off, I took some time to clean up underneath with some contact cleaner and dielectric grease.  I also thought it'd be the perfect time to flush the coolant system and replace w/ fresh coolant.  Buttoned it all back up and went for a ride with no surprises.  Upon my return, i let it idle for 4-5min and bingo, the fan kicked on.  I must say, I really like how this bike is responding to some love.  I think I'm gonna plan a trip to the beach in May and see what this whole touring thing is about.

  • Nashville
  • 1991 K75 | 1975 R90/6

Offline jllphan

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Re: Enjoying the past
« Reply #8 on: May 04, 2016, 09:34:14 AM »
I recently noticed a bit of a rattle at idle w/ the clutch out, so my first guess was monkey nuts.  Pulled the alternator to find this:





Not that I know exactly what they're supposed to look like, I didn't think they looked THAT BAD, even though you can see a fair amount of rubber spin off in the cup in the shot above.

Comparing the old and the new by feel, HUGE difference.  By appearance, not as much....






New nuts in, and ready to reinstall



Tonight I'm going to address the fork issue referenced in my other thread and then take it out for a spin Thur a.m. to see if I managed sort those two issues out. 
  • Nashville
  • 1991 K75 | 1975 R90/6

Offline K1300S

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Re: Enjoying the past
« Reply #9 on: May 04, 2016, 04:45:08 PM »
welcome to the "six wheel" bmw club!  I have had dozens of 4 wheel bmw's and last year added the two wheel variety.

interesting that you liked the RD350.  my first bike way back in the day was an RD 250.

current 4 wheel stable
75 BMW M2
97 BMW M3
02 BMW 325it
15 BMW X3
various BMW E30 race cars

That's awesome, the newest BMW i have is a 2001, I have more e30's than anything, buti really dig most their cars from 72'-'06.  What is a '75 M2?

a 75 M2 is a 2002 the way BMW Motorsports would have done it.  the generic formula for an M2 is
2002 Shell
S14 engine from an E30 M3
upgraded brakes and suspension.

mine is way beyond the basic formula.  full on street legal track car.  modified S14, custom Ground Control race suspension, custom wildwood brakes on all 4 corners, custom diff, etc, etc.  4k+ track miles in last couple of years.

PS - yes, your really needed new monkey nutz.  yours looked just like mine did when I replaced them.
Project Thread "K75s Midlife Refresh"
http://www.motobrick.com/index.php/topic,7810.0.html

Offline jllphan

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  • Posts: 32
Re: Enjoying the past
« Reply #10 on: May 06, 2016, 08:14:04 AM »
a 75 M2 is a 2002 the way BMW Motorsports would have done it.  the generic formula for an M2 is
2002 Shell
S14 engine from an E30 M3
upgraded brakes and suspension.

mine is way beyond the basic formula.  full on street legal track car.  modified S14, custom Ground Control race suspension, custom wildwood brakes on all 4 corners, custom diff, etc, etc.  4k+ track miles in last couple of years.

PS - yes, your really needed new monkey nutz.  yours looked just like mine did when I replaced them.

This makes me smile.  The thought of someone dropping that kind of coin on such a needy (yet beautiful) motor and then dropping it into an even more needy car.... a beautiful mess, I'm sure.  I'm not hating, I've just spent plenty of time around e30 ///M circles and 2002 circles to know they're a labor of love, to say the least.  But together (along w/ big brakes and great suspension), I'm sure that car is an absolute blast to drive and turns heads everywhere you go.  Gotta send me some pix!

Good to know my nutz were bad, lol.  I'm guessing they were original, so even if they only had 15k on them, they are still 25yr old.  I took the day off and plan to go for a spin shortly, hopefully all is well.
  • Nashville
  • 1991 K75 | 1975 R90/6

Offline jllphan

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Re: Enjoying the past
« Reply #11 on: May 21, 2016, 03:12:17 PM »
Slowly getting this thing how I like it.  I added an a240a windscreen today to replace the giant windscreen that was on it at purchase.  Going to a 7" headlamp opens some up some options for windscreens. I'm mostly happy with it as it shifts the wind off my body pretty good, but may go with a taller one to get it completely off my helmet.  I must say it ties the headlight, relocated oem turn signals, rNineT mirrors and S bars together....







And a few glamour shots given it's clean and I haven't posted too many....





Ok, now time to go ride, too nice of a day to be inside.
  • Nashville
  • 1991 K75 | 1975 R90/6

Offline johnny

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Re: Enjoying the past
« Reply #12 on: May 21, 2016, 03:19:44 PM »
looking good... windshield fits perfectly... just needs an iconic 22 liter hanging off the bung...

j o
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Offline mystic red

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Re: Enjoying the past
« Reply #13 on: May 21, 2016, 04:28:48 PM »
Good clean semi naked K. Have you posted it here yet?

Offline jllphan

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Re: Enjoying the past
« Reply #14 on: May 22, 2016, 01:43:49 PM »
looking good... windshield fits perfectly... just needs an iconic 22 liter hanging off the bung...

j o

ha, dunno about that, but if you have a recipe for a bong on the bung, i'm all ears.


Good clean semi naked K. Have you posted it here yet?

Thanks.  I have not, but will.
  • Nashville
  • 1991 K75 | 1975 R90/6

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