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Author Topic: RPM=Speed  (Read 17629 times)

Offline jeffhestand

  • ^ Motobrick Curious
  • Posts: 92
  • 1985 K100
RPM=Speed
« on: August 10, 2012, 02:42:04 PM »
Finally got my 85 back on the road... Of course speedo continues to defy me and not work... So.. if all of you could provide with a ball park figure that in 5th Gear at 4K RPM you are going X that would be great... This bike sure seems to want for a 6th gear as well... thanks
jeff hestand
85 K100 RT
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1985 K 100... Gettin better all the time!!

Offline frankenduck

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Re: RPM=Speed
« Reply #1 on: August 10, 2012, 02:58:22 PM »
What it "wants" is high RPMs. It is not a car or a Harley.
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Offline jeffhestand

  • ^ Motobrick Curious
  • Posts: 92
  • 1985 K100
Re: RPM=Speed
« Reply #2 on: August 10, 2012, 03:45:05 PM »
Frakenduck- what do you feel the optimul RPM for this engine... It does seem to want to rev and i have not pushed it too far... Maybe since the the speedo is broke and i do not know the true mileage i am a little hesitant. I have seen them sailing along on U Tube at 220 KMH.
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Offline frankenduck

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Re: RPM=Speed
« Reply #3 on: August 10, 2012, 03:57:53 PM »
7,000-8,000 RPM

Go ahead and bounce it off of the rev limiter.  These engines are pretty bulletproof.  (Provided you change the oil on a reasonable interval.) Half tank of fuel or more is recommended.  If you go balls out with a low tank you can starve the fuel pump since it's in the middle of the tank and the gas gets pushed to the rear.  It doesn't hurt anything, just makes for a jerky ride.

Need to make a quick pass?  Chop it down to third and let 'er rip. :yes

It's just a matter of getting used to riding it. :mbird

(Insert usual disclaimers here about riding that way on public roads.)
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Once I had a Collie pup. Dug a hole and covered him up. Now I sit there by the hour. Waiting for a Collie-flower.
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Offline jeffhestand

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  • Posts: 92
  • 1985 K100
Re: RPM=Speed
« Reply #4 on: August 10, 2012, 04:22:43 PM »
WOW!!!! 7 to 8K on this beast  i would be flat flyin.... on the highway at 65 or 70 what is the typical RPM( sounds like ur not at that speed much though)  :laugh
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Offline frankenduck

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Re: RPM=Speed
« Reply #5 on: August 10, 2012, 04:46:40 PM »
It varies by bike.  If someone chimes in with a number then be sure to verify that they have the same final drive ratio that your bike does. (Stamped into final drive right behind where it mounts to the swing arm.)
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Once I had a Collie pup. Dug a hole and covered him up. Now I sit there by the hour. Waiting for a Collie-flower.
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Offline CubPilot

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Re: RPM=Speed
« Reply #6 on: August 10, 2012, 04:51:07 PM »
My will not tach more than 82-8300, and then if I hold it against the stops, it will search up and down about 300.  What should the limiter be set at?  I suppose that you have to have "special software" to set that. Best fun is Bike Week at Daytona.  Cruise up the interstate about 65-70 and let a crotch rocket or two pull out to pass and drop it in to 3rd and tach it out, right against the stops.  This K is still pulling at 135, mine, just are not big enough to see how far it will go before that little voice is asking just what the hell I think I'm doing.   It is still fun even at my age.   Those rice rockets might get there but they just won't do it as fast in the higher ranges.   You have to watch that front end as it will still come off the road at 60, and startles the hell out of me.  They don't call these things Flying Bricks without just cause! 
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Offline k100

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Re: RPM=Speed
« Reply #7 on: August 10, 2012, 05:21:30 PM »
i also have a bad speedo so if sumone could anser the questian that would be nice
 :beatdeadhorse: :beatdeadhorse: :beatdeadhorse:
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Offline frankenduck

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Re: RPM=Speed
« Reply #8 on: August 10, 2012, 05:23:23 PM »
Quote from: CubPilot on August 10, 2012, 04:51:07 PM
I suppose that you have to have "special software" to set that.

No software, it's a chip.  You'd either need a differently programmed chip or a programmable chip.
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Once I had a Collie pup. Dug a hole and covered him up. Now I sit there by the hour. Waiting for a Collie-flower.
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Offline Scott_

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Re: RPM=Speed
« Reply #9 on: August 10, 2012, 06:01:13 PM »
Well, on my stock '95 1100LT, 4K rpm is 65mph.
My FD is stamped 33/12
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Offline frankenduck

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Re: RPM=Speed
« Reply #10 on: August 10, 2012, 06:43:40 PM »
Quote from: k100 on August 10, 2012, 05:21:30 PM
i also have a bad speedo so if sumone could anser the questian that would be nice
 :beatdeadhorse: :beatdeadhorse: :beatdeadhorse:


Fix a flaky or inoperative K bike speedometer
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Once I had a Collie pup. Dug a hole and covered him up. Now I sit there by the hour. Waiting for a Collie-flower.
New to K bikes? Click here.
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Offline wmax351

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Re: RPM=Speed
« Reply #11 on: August 10, 2012, 08:25:50 PM »
On my stock 1991 K75, with a 32:10 rear drive, 5th gear on the fwy is 80 mph (calibrated) at 6000 rpm.

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  • Albuquerque, NM
  • 91 BMW K75 Standard, 98 Moto Guzzi California EV
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Current:1991 BMW K75 Standard, 1998 Moto Guzzi California EV11
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Offline motodude

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Re: RPM=Speed
« Reply #12 on: August 10, 2012, 08:32:34 PM »
Stock '90 K75RT 32:10 fd w/ no calibration, 5k rpm == 70 mph, it will run there all day long.  I've run it at 6.5k rpm continuously for hours at a time in NV no problem.

YMMV,
Tom
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'87 K100RS Motorsport
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Offline BobZ(IL)

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Re: RPM=Speed
« Reply #13 on: August 10, 2012, 09:45:49 PM »
Borrow a GPS and tape it to your handlebars. Make note of speed at various rpms. Also take another look at the hp/torque curve FD posted. There is a definite sweet range between 4000-6000. Thats where the fun lies.
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Offline jeffhestand

  • ^ Motobrick Curious
  • Posts: 92
  • 1985 K100
Re: RPM=Speed
« Reply #14 on: August 14, 2012, 12:38:27 PM »
well after some soul searching i decided to go ahead and install a bicycle speedo last night...For 46 bucks and am getting back speedo,, trip meter,, odometer plus another clock and avg speed and max speed ( last 2 are important to bicycle riders).. the rtv is curing today.. Ill let u know how it turns out...
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1985 K 100... Gettin better all the time!!

Offline lhead

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Re: RPM=Speed
« Reply #15 on: August 15, 2012, 07:55:43 AM »
Hey Bro,
On the rs an indicated 60mph is ballpark 4k.
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1993 K1100rs

Offline jeffhestand

  • ^ Motobrick Curious
  • Posts: 92
  • 1985 K100
Re: RPM=Speed
« Reply #16 on: August 15, 2012, 08:26:13 AM »
yeah... the bicycle speedo worked great this AM but now i am going to have to get the wheel rebalanced. Small price to pay to have a working speedo and odometer....  :bmwsmile
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1985 K 100... Gettin better all the time!!

Offline sh00ter

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Re: RPM=Speed
« Reply #17 on: August 15, 2012, 11:31:09 AM »
Quote from: jeffhestand on August 15, 2012, 08:26:13 AM
yeah... the bicycle speedo worked great this AM but now i am going to have to get the wheel rebalanced. Small price to pay to have a working speedo and odometer....  :bmwsmile

Ride-on time !!! Just got some myself. 
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'94 1100 RS

Offline Opus

  • ^ Proficient Motobricker
  • Posts: 246
  • 1988 K100 LT
Re: RPM=Speed
« Reply #18 on: August 15, 2012, 07:55:22 PM »
Jeff, don't know if this will help but here is a link to a 1985 K100LT that can ba a parts bike.

http://lawrence.craigslist.org/mcd/3192804205.html

Plactics looks good and it has a Inst. Panel.

Just an fyi...

Opus....
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Toney

1988 BMW K100LT (Current Project Bike)
1982 Honda GW 1100 I (Sold and will be missed)
1975 Honda CB550F [MOD] (Sold)
196x Sears Allstate 250 (Traded in for CB550F)
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