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Author Topic: Is a sustained 7,000 RPM too much? How about 8,ooo?  (Read 39760 times)

Offline The Dude

  • ^ SuperNatural Motobricker
  • Posts: 509
Re: Is a sustained 7,000 RPM too much? How about 8,ooo?
« Reply #25 on: February 08, 2017, 12:43:17 PM »
You can add another 76 hours to those 24.From what I was told by BMW back in the '90s.They were then stripped down for inspection.
A modern engine regularly does 300 hours at full wack in QA testing.(Hyundai diesel).
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  • Auckland, New Zealand
  • K75s
Current.
TR6R 1973 from new.
Moto guzzi 850 III .1983 from,almost, new.
K75S 1986 from new.vin-0103141
On my second millionth km.give or take a hundred k Kay's.
"The Dude abides. I don't know about you but I take comfort in that. It's good knowin' he's out there."
All the best!

Offline mg1

  • Motobrick Curious
  • Posts: 22
Re: Is a sustained 7,000 RPM too much? How about 8,ooo?
« Reply #26 on: February 10, 2017, 04:41:32 AM »
Sounds like an "italian tune up".  A certain mechanic I know of was said to indulge in such a tune up, where a K had its fluids changed and then run out to a deserted stretch of country road and run at full throttle for 30 minutes or so then handed back to its owner.  It supposedly had the effect of decarbonising the motor (many K owners being very conservative in their riding style, leading to carbon build up and consequent rough running) and the unwitting owners thought it was great.  Not sure how much store to put by that story, but I do know that my wife bought a non-runner ex-Police K75RT at the auctions once upon a time.  It had been used for escort duty by the WA constabulary until its HES failed.  Once it was back on the road again, it didn't run happily for some months, until we took it on a long interstate trip at an - err- "brisk" pace and it eventually cleared its throat over 1000km or so.  Ran fine after that.  As other inmates have said on this forum, K bikes love to rev. Keep up the maintenance and let it rip.


Martin the other
in the bloody hot Riverina, Australia
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  • central NSW, Australia
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Offline Motorhobo

  • +25 years of K75
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Re: Is a sustained 7,000 RPM too much? How about 8,ooo?
« Reply #27 on: February 10, 2017, 06:55:21 AM »
Well, now that you've all put the fear in me I ran my bike at 80 in third for a half hour just to keep it happy. That's about the only way to get it to 7k rpm around here.

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1994/1995 K75 ABS Frankenbike: original engine 136k miles, frame from Gary Weaver (RIP), 173k miles -- Current Odometer: 198k miles
1994 K75 since 2013, 82,000 mi (19k mine) w/California Sidecar Friendship II Sidecar & Black Lab 'Miss B' - RIP

Past: 1974 Honda 550/4 (first bike), 1994 K75 (sold), 1995 K75 ABS (parts bike), Sidecar Dog & Best Bud 'Bo' - RIP

Offline Vespa no more

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Re: Is a sustained 7,000 RPM too much? How about 8,ooo?
« Reply #28 on: February 12, 2017, 05:30:55 AM »
In Australia, the Northern Territory was (in)famous for an attempt at a cannonball run. A few fellas with all the gear ... came unstuck. Don't know what the speed limits are these days and it is a long ride there.


Finally got an opportunity to open up my K100 (has been off the road for some years) after getting around a convoy of sunday harley riders. It found another lung above 7000rpm and I backed off at 7500. Just made me want to see if 8000 + was on. But being grown up and mature haven't found the moment.


Am playing around with an ex-police K1100. Looking into the fuel injector holes and into the top of the throttle bodies there is plenty of grot - which adds credence to the comments earlier. Will need a good clean and sustained run... whenever that happens.



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  • Wollongong NSW AUSTRALIA
  • K100RT 1984, K1100RT 1993, Vespa VNB125 1963 :)

Offline beemrdon

  • ^ Proficient Motobricker
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Re: Is a sustained 7,000 RPM too much? How about 8,ooo?
« Reply #29 on: February 12, 2017, 11:27:05 PM »
The more I think about it, the more I feel that the only folks that really know are the engineers that designed this motor (and all of the other K...brick motors. They are probably retired by now (or worse).
I am not just concerned with the motor but all of the driveline parts.
As to where you can run at 8,000 RPM for more that a few miles, I'm going to tell you. North on 95 out of Las Vegas, about 20-25 miles up the road after you pass the prison. I went 125 there and could have gone faster but backed off because I was revving @7,000rpm and wasn't sure about the sustainability of this course of action on the drivetrain....after having run 100-110 for miles. The road is ultra smooth and straight only undulating somewhat and I felt entirely comfortable at 110+ and very little traffic.
Also, interstate 80 in Wyoming has a posted limit of 80 mph in places but many are going at least 10-15 mph over that and some are moving MUCH faster. :yow

 
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  • The South West... best motorcycling in the US! Longest riding season = 12 months per year
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Offline The Mighty Gryphon

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Re: Is a sustained 7,000 RPM too much? How about 8,ooo?
« Reply #30 on: February 13, 2017, 12:49:28 AM »
I have done I-80 in Wyoming several times with my K75 and running at 95 for an hour or so is no problem.  There aren't any places where I have been where I can ride over 100mph for any extended length of time like for a complete tank of fuel.

As I mentioned earlier, they will run at 80-85mph for at least 24 hours.  Can't see where 100mph for that length of time would be a problem.
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  • In my garage in Marilla, NY
  • '91K100RS White/Blue
Current:
'91 K100RS16V "Moby Brick Too"

Past:
'94 K75RT "Ilsa, She Wolf of the SS"
'92 K100RS16V "Moby Brick" (RIP, deceased in a vehicular assault)
'94 K75S Special Edition Dakar Yellow "Cheetos"
'89 K100RS Special Edition "Special Ed"

Offline beemrdon

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Re: Is a sustained 7,000 RPM too much? How about 8,ooo?
« Reply #31 on: February 14, 2017, 03:06:41 AM »
Gryph, do you have a 4 valve K of the 3 that you own? I have never ridden an 8 valve (K100/75) so I don't know what kind of power they make.
My K1100 4 valve will cruise at 110 effortlessly, as I have found out. I have upgraded suspension front and rear and also Michelin PR 3 & 4 tires. It feels rock solid at triple digit speeds.
Anyway, once past the prison on 95 N, you can go maybe 20 to 30  miles +/- before it turns into a 2 lane highway. Then you really need to slow down but can stil run at 85 to 90. Cruising at that speed last Sunday, I was passed by an old honda civic going at least another 20mph faster. (That didn't feel right.)
I'm pretty sure that there are other Nevada roads where you can turn it loose but I am still exploring the area and haven't been very many places yet.
As far as using up a tank of gas at triple digit speeds, you'll probably have to slow down occasionally no matter where you are but I think I-80 is a good road for that simply because everyone is driving so fast and it is so long, plus the fact that you can see for miles and miles down the road.
There are probably other roads in places like Texas and Arizona to name a couple where you can "turn it loose"
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  • The South West... best motorcycling in the US! Longest riding season = 12 months per year
  • 1996 K1100 LT SE, Aspen Silver - Now with 159,xxx miles.

Offline The Mighty Gryphon

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Re: Is a sustained 7,000 RPM too much? How about 8,ooo?
« Reply #32 on: February 14, 2017, 08:28:43 AM »
My K100 is a 4V.  Since it is getting a bit long in the tooth I have been keeping it under 150 miles from home until I feel a bit more confident in it.  It has a lot of power and I have yet to wring it out for fear of the police.  Fastest I've had it is 110 for short bursts. 

My road bike is the K75RT.  Three times now, I've had it out west where I can open up for long runs.  Last summer in central Wyoming I did about 140 miles at a steady 90 with higher bursts.  I could have easily gone faster, but it was evening and there were a lot of antelope coming out along the road. 

To be doing that kind of speed on a 23 year old bike with 80k in the middle of nowhere, solo, 1500 miles from home should tell you what kind of confidence these machines inspire.
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  • In my garage in Marilla, NY
  • '91K100RS White/Blue
Current:
'91 K100RS16V "Moby Brick Too"

Past:
'94 K75RT "Ilsa, She Wolf of the SS"
'92 K100RS16V "Moby Brick" (RIP, deceased in a vehicular assault)
'94 K75S Special Edition Dakar Yellow "Cheetos"
'89 K100RS Special Edition "Special Ed"

Offline Motorhobo

  • +25 years of K75
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Re: Is a sustained 7,000 RPM too much? How about 8,ooo?
« Reply #33 on: March 08, 2017, 07:41:26 AM »
Quote from: Motorhobo on February 10, 2017, 06:55:21 AM
Well, now that you've all put the fear in me I ran my bike at 80 in third for a half hour just to keep it happy. That's about the only way to get it to 7k rpm around here.

Well, don't do what I did -- since that day second gear has been skipping and now I have big s**t to deal with. Was there a correlation between hi-revs in third and the skipping/slipping in second? I can't prove it but one day it didn't skip and then I rode at 7000k in third and the next day it did. So...don't do it.

I'll start a new thread about this skipping in 2nd thing soon when I have some time. Basically I have one transmission that works fine except for the bad input shaft and one transmission that skips in second but has a good input shaft. I want to put the good input shaft into the good gear transmission and take apart the remaining transmission as a science project...more later.

But bottom line -- my bike has been perfectly happy averaging 5k rpms with an occasional whatever 85-90mph on the freeway gets me -- I don't know why I listened to you redline-fetishists!
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1994/1995 K75 ABS Frankenbike: original engine 136k miles, frame from Gary Weaver (RIP), 173k miles -- Current Odometer: 198k miles
1994 K75 since 2013, 82,000 mi (19k mine) w/California Sidecar Friendship II Sidecar & Black Lab 'Miss B' - RIP

Past: 1974 Honda 550/4 (first bike), 1994 K75 (sold), 1995 K75 ABS (parts bike), Sidecar Dog & Best Bud 'Bo' - RIP

Offline Ultima

  • Motobrick Curious
  • Posts: 14
Re: Is a sustained 7,000 RPM too much? How about 8,ooo?
« Reply #34 on: March 30, 2017, 11:00:34 AM »
When the K1 was launched a journalist had one for a loan by BMW. He picked up the bike at BMW Factory and went down to Sevilla and back at full throttle on the highway. About 2000 km at more than 220 km/h.
Then the motorcycle newspaper gave the bike to every journalist encouraging them to make some bike distance at full throttle, all this for 50.000 km.
Then took the bike back to BMW factory where the engine was dismantled. Result? Barely no sign of use!!!!!!! [size=78%]http://isatis.mecanique.free.fr/K1/50_Mm/p1.html[/size]
So you can go with your bike.
Read this link in French with google translation. There is a link if you press "site" at one point in the beginning of the text.
By the way, the website of this guy isatis.mecanique .fr is just the Bible for all K fixings and repair...
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  • Paris
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Offline beemrdon

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Re: Is a sustained 7,000 RPM too much? How about 8,ooo?
« Reply #35 on: March 30, 2017, 01:41:57 PM »
I used to have a sooty exhaust pipe end while living & riding around Massachusetts. Now my exhaust end (muffler) is clean. I guess I have been giving the old gal an "Italian tune up" lately.
BTW, It looks like 8,000 rpm in 4th is approaching 120...too much happening all at once to watch the speedometer closely though (pasing a Porche that didn't want to be passed).
Ultima, good to know about the motors..
  :yow
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  • The South West... best motorcycling in the US! Longest riding season = 12 months per year
  • 1996 K1100 LT SE, Aspen Silver - Now with 159,xxx miles.

Offline bizzaro

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Re: Is a sustained 7,000 RPM too much? How about 8,ooo?
« Reply #36 on: September 27, 2017, 09:42:37 PM »
Quote from: The Mighty Gryphon on February 08, 2017, 08:51:41 AM

Beemerdon, you gotta tell us where we can run at 140+mph for more than a couple miles at a time without winding up in the slammer going through Craig's List looking for a new bike, or does your transmission only work in 1st and 2nd gear?
Maybe I should find a different thread........But................Route 9 in Maine between Bangor and Calais.  Almost 100 miles of kick ass highway. Pick a gear, and pin the throttle. I recommend 4..... 5 if you got the balls and more importantly the skills.! Half of it just paved, the rest is in great shape.  Some blind hill tops, corners are perfectly engineered for constant radius, and line of sight is great.  So ya get the angle, hold, and run.................Watch for moose n deer.   Three small towns, traffic nil.............................just did it this weekend.  Fantastic high speed cornering.  :2thumbup: :2thumbup: RPM.............ah, just keep it short of the 89K cut out point. It is all gravy till then!
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  • Vermont
  • Current:1994 BMW K1100LT Previous: 1982 Yamaha virago 920,1973 Honda CB550,1976 Yamaha 650 Special
See Ya in the Twisties,
 Bizz

Offline mavam

  • Motobrick Curious
  • Posts: 13
Re: Is a sustained 7,000 RPM too much? How about 8,ooo?
« Reply #37 on: November 22, 2019, 09:40:31 AM »
I'm still learning a lot about my new K75 and I specifically searched for RPM because this bike is a bit deceiving (in a good way). It was obvious that it liked to sit higher in the rev range than some other bikes I've had. I wasn't really used to cruising above 4.5k on my previous bike, a Multistrada 1,000 (2v Ducati oil cooled 1000cc), unless I was riding hard in the twisties -- 6-7k would really put smile on my face on that, but not for sustained periods. And below 3k, it did nothing.

The brick seems comfortable anywhere above 3k rpm and goes like a turbine. I'm thrilled to know that shifting at the redline and winding it up to 6k or more at highway speed suits it well. I did just that on my commute this morning. Got to work a bit faster, too  :yawl:
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  • Virginia
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Offline The Mighty Gryphon

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Re: Is a sustained 7,000 RPM too much? How about 8,ooo?
« Reply #38 on: November 22, 2019, 12:28:13 PM »
I have heard that the K bike engine is designed to run nonstop at redline for 24 hours. 

I've done continuous 100+mph runs on my K75RT out west for over 50 miles at a time.  I think nothing of doing 85+ for 12-14 hours on the interstate to get through Iowa and Nebraska.  Last year I averaged over 85mph on I-70 crossing Kansas from Denver to Topeka.   These bikes love it.
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  • In my garage in Marilla, NY
  • '91K100RS White/Blue
Current:
'91 K100RS16V "Moby Brick Too"

Past:
'94 K75RT "Ilsa, She Wolf of the SS"
'92 K100RS16V "Moby Brick" (RIP, deceased in a vehicular assault)
'94 K75S Special Edition Dakar Yellow "Cheetos"
'89 K100RS Special Edition "Special Ed"

Offline Martin

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Re: Is a sustained 7,000 RPM too much? How about 8,ooo?
« Reply #39 on: November 22, 2019, 01:47:50 PM »
Ayr Highway 1675 Km's of straight road across the Nullarbor Plain. You do however have to share it with Roo's, Emu's, Wombats, Camels and Road trains. A good cooling system is also required.https://www.australiantraveller.com/sa/outback-sa/nullarbor/driving-the-nullarbor-an-unlikely-summer-holiday/
Regards Martin.
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  • North Lakes Queensland Australia
  • 1992 K75s Hybrid, Lefaux, Vespa V twin.

Offline Scott

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Re: Is a sustained 7,000 RPM too much? How about 8,ooo?
« Reply #40 on: November 23, 2019, 09:12:26 AM »

* Screenshot 2019-11-23 at 06.10.14.png (41.59 kB . 768x431 - viewed 1664 times)
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  • SoCal
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Offline cycleman

  • Motobrick Curious
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Re: Is a sustained 7,000 RPM too much? How about 8,ooo?
« Reply #41 on: November 28, 2019, 12:28:00 PM »
I realize this is an old post, but thought I'd add what is shown in the K100/K100LT owners manual. The K100 manual says max continuous engine speed is 8500 rpm. There is a slight difference between the K75 posted above and the K00. Not sure if the K75 had balance shafts, but if so that is likely the reason for the difference.

The max permissible engine speed on the K100 is 8600 rpm, which would be red line.

Not sure if the brick is like most bikes but it is hard to ever hit 8500 with stock gearing in 5th, as the resistance to wind etc with a fairing is high.
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  • Alberta Canada
  • 1986 K100RT

Offline johnny

  • TrailBrakingThrottleWhacker
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Re: Is a sustained 7,000 RPM too much? How about 8,ooo?
« Reply #42 on: November 28, 2019, 12:48:40 PM »
greetings...

its easy to hit 8600 rpm in 1st 2nd and 3rd gears... its not how fast you go... it how fast you getts there...

i hitts the rev governour on a regular basis... do you know what happens when you hitts the rev governour...

j o
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  • :johnny i parks my 96 eleven hundert rs motobrick in dodge county cheezconsin  :johnny

Offline Past-my-Prime

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Re: Is a sustained 7,000 RPM too much? How about 8,ooo?
« Reply #43 on: November 28, 2019, 07:35:15 PM »
Quote from: johnny on November 28, 2019, 12:48:40 PM
greetings...

its easy to hit 8600 rpm in 1st 2nd and 3rd gears... its not how fast you go... it how fast you getts there...

i hitts the rev governour on a regular basis... do you know what happens when you hitts the rev governour...

j o

Johnnie I've never hit the rev governor!  I'm going to have to go now and try it!  Oh, wait air full of cold and driveway full of ice and drive shaft full of not splines. . .
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  • North Shore of Lake Superior (in my garage)
  • BRICK: 1989 K75 RT - Rocinante; NON-BRICK: 2007 F650 GS Dakar - Betty Blue

Offline alabrew

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Re: Is a sustained 7,000 RPM too much? How about 8,ooo?
« Reply #44 on: November 29, 2019, 04:05:16 PM »
"Not sure if the brick is like most bikes but it is hard to ever hit 8500 with stock gearing in 5th, as the resistance to wind etc with a fairing is high."

That guy on youtube who recorded himself on the autobahn on a k100rs comes purdy close.
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  • Birmingham, Alabama
  • 1985 K100, 1991 K100RS
Also:
2005 K1200LT
1979 R65
200,000 miles on BMW motorcycles

Offline Laitch

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Re: Is a sustained 7,000 RPM too much? How about 8,ooo?
« Reply #45 on: November 29, 2019, 04:39:48 PM »
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  • Along the Ridley in Vermont.
  • 1995 K75 89,000 miles

Offline Past-my-Prime

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Re: Is a sustained 7,000 RPM too much? How about 8,ooo?
« Reply #46 on: November 29, 2019, 06:03:08 PM »
Wow 250 km/hr.  The road gets very narrow at that speed.

I'm impressed at his restraint, not passing on the right.

I've had my K75 at 220-225 on the Autobahn over 20 years ago (you're not supposed to go that fast if you have a fairing) but it felt rock steady, just faster than my comfort allowed for very long.
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  • North Shore of Lake Superior (in my garage)
  • BRICK: 1989 K75 RT - Rocinante; NON-BRICK: 2007 F650 GS Dakar - Betty Blue

Offline johnny

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Re: Is a sustained 7,000 RPM too much? How about 8,ooo?
« Reply #47 on: November 29, 2019, 06:14:21 PM »
greetings...

when i rode the audiobahn the rental guy told me not to pass on the right for any reason... the folks i was going to visit told me the same thing...

oughtta be that way here in the usa...

i have had my motometer all the way to 160mph... 2 up of course... needs a smooth dry surface a little or no wind... cause it can getts away from you real fast as it wraps around past the fuel and abs lights on the way back to zero...

j o
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  • :johnny i parks my 96 eleven hundert rs motobrick in dodge county cheezconsin  :johnny

Offline Nine80seven

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Re: Is a sustained 7,000 RPM too much? How about 8,ooo?
« Reply #48 on: November 29, 2019, 07:10:11 PM »
Illegal to pass on the right on autobahn, IIRC.  240 kph is somewhere around 149 mph.  Speedometer must be rich.  Or, that's not a K100RS.  Maybe a four valve?  Taller rear gear?  Do a hunnerd around here for a few miles, get ticketed, reckless riding.  On two laners county Mounties are watching.  Sad.  Cages are weaving all over the same road playing with their thingees.  I watch that vid whenever I think of it. 
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Offline Laitch

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Re: Is a sustained 7,000 RPM too much? How about 8,ooo?
« Reply #49 on: November 29, 2019, 07:29:08 PM »
Quote from: Nine80seven on November 29, 2019, 07:10:11 PM
Speedometer must be rich.  Or, that's not a K100RS.  Maybe a four valve?   
Not maybe. In the description under the video at YouTube, the contributor indicates that it's a 1990 4V.
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  • Along the Ridley in Vermont.
  • 1995 K75 89,000 miles
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