BMW K bikes (Bricks)

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1Back to top Go down    gearbox lube on Tue Jul 03, 2018 8:10 pm

brickrider2

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The K-bikes gearboxes - as far as I know - all require GL-5 lubricant. Locally I typically find this in 80-90 and 80-145 (?) weights. There are some who say that Castrol GL-5 Limited Slip is preferred. Can anyone enlighten me on how this differs from your garden variety GL-5 lube?

    

2Back to top Go down    Re: gearbox lube on Tue Jul 03, 2018 8:41 pm

92KK 84WW Olaf

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I very much expect that when the K was designed only the regular 80W90 was available. Seems a lot of 80W140 or 145 about now.

Presumably that Castrol has a moly additive.......some of usadd this in anyway.


__________________________________________________
1992 K100LT 0193214 Alaska Blue 101,000 miles
1984 K100RT 0022575 Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Mystic Red 58,645 now 69,000 miles
    

3Back to top Go down    Re: gearbox lube on Tue Jul 03, 2018 10:15 pm

duck

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What's more important than the gear oil weight is adding some moly. Once it works its way in in a few hundred miles the bike will shift noticeably more smoothly.

I usually use Mobil 1 75-140 on a 20K interval.

And K bike trannies generally don't wear out. Like many other aspects of Ks they are pretty bulletproof.

Although there's a grub screw in there that can work loose and cause issues.

And if you don't keep the clutch splines properly lubed then you can strip the splines on the input shaft.


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

4Back to top Go down    Re: gearbox lube on Wed Jul 04, 2018 5:06 pm

Point-Seven-five

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+1 on the moly. I add a bit of 1.5 micron powder when I change the oil and where my bikes shifted hard and clunky, especially on downshifts, when I got them, they shift like the best of the riceburners now.


__________________________________________________
Present:
1994 K75RT
1994 K75S
1992 K100RS

Past:
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

5Back to top Go down    Re: gearbox lube on Wed Jul 04, 2018 7:51 pm

Dai

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@Point-Seven-five wrote: they shift like the best of the riceburners now.
You obviously don't own a Bandit...


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'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

6Back to top Go down    Re: gearbox lube on Wed Jul 04, 2018 11:03 pm

Point-Seven-five

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@Dai wrote:
@Point-Seven-five wrote: they shift like the best of the riceburners now.
You obviously don't own a Bandit...
No, but I rode and competed on Hondas for 20 years.


__________________________________________________
Present:
1994 K75RT
1994 K75S
1992 K100RS

Past:
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

7Back to top Go down    Re: gearbox lube on Thu Jul 05, 2018 12:24 am

brickrider2

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maybe try some moly in the Bandit box? Wink

    

8Back to top Go down    Re: gearbox lube on Thu Jul 05, 2018 6:18 pm

Dai

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@Point-Seven-five wrote:
No, but I rode and competed on Hondas for 20 years.
Yup! - Know about those boxes too. Well, up to the late '90s anyway - I've no idea if they've improved since.


__________________________________________________
'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

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