BMW K bikes (Bricks)

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1Back to top Go down    K75 32:10 Final Drive on a K100 on Sat Jul 05, 2014 6:34 pm

duck

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This may not be for the "Where's 6th gear?" club but, having put lots of miles on various K bikes over the years, I've learned that RPMs are your friend, not your enemy.

I'm sure I'm not the first to have done this but IMHO it does give a noticeable roll-on torque improvement that I like.Mathwise, a K75 32:10 FD has 13.5% "shorter" gearing than the stock 31:11 FD of an RS. And, since the RPMs for a given speed are further up the power curve, there's even a bit more. Butt-dynoreports that it has noticeably more 5thgear roll-on then a K1100RS.

RPM-wise, it runs in the low 5,000s when doing 70 MPH-ish on the freeway. I have this K100 pretty dialed in/sync'd with 18 oz Manic Salamander bad ends so, although there are some minor vibes, it's not very noticeable or hand-numbing.

Bottom line: Two thumbs up.

Potential downsides:

Lower gas mileage. Ask me if I care.

Increased engine wear: Not relevant on a K bike.

Maybe it'll burn oil a little faster. Non-issue to me.


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Current stable:
86 Custom K100 (K75C fairing, K75 Belly pan, Ceramic chromed engine covers, 32/10 final drive)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
93 K1100RS
94 K1100RS
93 K1100LT
91 K1
93 K75S
http://www.ClassicKBikes.com
    

2Back to top Go down    Re: K75 32:10 Final Drive on a K100 on Sun Jul 06, 2014 8:26 am

K75cster

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Well Duck, Now you have a bike to do a toy run on. One of the things I liked about the 32:10 is that you can let the clutch out at idle and roll along at walking pace or a bit slower, And so it goes that when I moved to a 2.91:1 final I noticed the gearing most at idle, the 75 just didn't walk off the line like it used too. And using a 3.2:1 final on a K100 would have stopped the journo's from whinging about our bikes against the Honda's and Kawasaki's of 1984 to 1988 when every bike mag bagged our bikes out for not keeping up with the highway fryers in the bike comparo's.


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Keith - 1987 K75c with r100rt replica fairing and half of a 1984 K100rt

The Clever are adept at extricating themselves from situations that the wise would have avoided from the outset - QUOTE from david Hillel in Out of the Earth.
    

3Back to top Go down    Re: K75 32:10 Final Drive on a K100 on Fri Jul 11, 2014 4:12 am

duck

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Update: The more I ride this bike, the more I like it. The 32/10 roll-on is noticeably better and I"m surprised that more people haven't done this.

Sadly, I'm still going to sell it though since this bike got eclipsed as my errands bike by the turbo K75


__________________________________________________
Current stable:
86 Custom K100 (K75C fairing, K75 Belly pan, Ceramic chromed engine covers, 32/10 final drive)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
93 K1100RS
94 K1100RS
93 K1100LT
91 K1
93 K75S
http://www.ClassicKBikes.com
    

4Back to top Go down    Re: K75 32:10 Final Drive on a K100 on Fri Jul 11, 2014 10:53 pm

orforester

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Sad to sell a K bike, they are sooo good, but the prices for used ones are in the toilet! You almost have to give them away.


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89 K 100 RS se
85 K 100 RT
    

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