BMW K bikes (Bricks)

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1Back to top Go down    Sprag clutch on Sat Jul 21, 2018 1:39 am

gabriel


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Hi

I think I am starting to have issues with the dreaded sprag clutch
I was riding my bike tried to restart the bike unsuccessfully

Placed the bike in second gear let the clutch out and the bike started immediately

I was thinking if I can access the sprag clutchthru the started motor opening
Perhaps use an extended nozzle to spray wd40 thru the hole where the starter is positioned

Any thoughts

Regards

Gabriel


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;BMW; 1984 BMW k100..frame number 6228?
    

2Back to top Go down    Re: Sprag clutch on Sat Jul 21, 2018 1:57 am

MartinW

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I don't think you have the holes in the sprag clutch. You could try running a high detergent oil for a few hundred or so K's. Until cleaned it will mean picking places to stop where you can roll start. Quite a few inmates have cleaned their sprags this way.
Regards Martin.


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K75s Hybrid
    

3Back to top Go down    Re: Sprag clutch on Sat Jul 21, 2018 3:23 am

nobbylon

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I used a mix of half and half 20w50 and dex atf fluid. Ran the bike on stand for 20 mins at 3000rpm. drained and refilled with fresh 20w50. It really does clean everything out. Donít ride with this mix though.



Last edited by nobbylon on Sat Jul 21, 2018 4:14 am; edited 1 time in total


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R1100GS Feb 1995
K100RS July 1989
K100 Dec 1983†
R90s June 1975
R75/6 Feb 1976
F650GD May 2001
    

4Back to top Go down    Re: Sprag clutch on Sat Jul 21, 2018 4:05 am

charlie99

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Gabriel

to access the sprag clutch its not through the starter motor its through the crank cover

carbi cleaner might help Ö.just a squirt or two

the easiest way to keep it clean is not to let it sit for too long without running the motor at least

good luck


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
    

5Back to top Go down    Re: Sprag clutch on Sat Jul 21, 2018 7:52 am

robmack

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A member here came up with his own version of your idea and posted about it:
http://www.k100-forum.com/t8416-sprag-sprague-clutch-easy-fix-diy


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Robert
1987 K75 @k75retro.blogspot.ca
2011 Moto Guzzi V7 Racer
http://k75retro.blogspot.ca/
    

6Back to top Go down    Re: Sprag clutch on Mon Oct 01, 2018 5:43 am

gabriel


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Gold member
Hi

Todayís experience made me realise how I sometimes jump to conclusions and make false assumptions.
I decided to replace the battery with a known good battery from my K75s and I realised it was my battery that was causing my issues with the bike.
I suppose if we try hard enough, we can convince ourselves of almost anything and I wonder how much of the sprague clutch issues we Experience is actually a faulty battery.
Itís so easy to underestimate the importance of a properly functioning battery, especially when we have electronic fuel injection.
I have once †again learned a valuable lesson.
Hope this advice helps others.
I am currently disassembling my K75s and checking my splines. I have a notchy gearbox.
Final drive and driveshaft splines are in excellent condition. Iím hoping the gearbox input shaft splin is in excellent condition.
Is it ok for me to use Castrol optimal paste for ALL the splines?


Regards

Gabriel


__________________________________________________
;BMW; 1984 BMW k100..frame number 6228?
    

7Back to top Go down    Re: Sprag clutch on Mon Oct 01, 2018 5:52 am

92KK 84WW Olaf

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On sprag clutches its important to note early ones do NOT have the three holes that you can access through the right hand engine cover. My K100RT is a 32/84 engine build and does not have the holes in it. The first 4 digit part of the engine number is week/year it was built.


__________________________________________________
1992 K100LT 0193214 Bertha Alaska Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 58,645 now 83,050 miles
    

8Back to top Go down    Re: Sprag clutch on Mon Oct 01, 2018 7:23 am

Point-Seven-five

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I am curious as to how a weak battery could cause the sprag not to engage.


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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
    

9Back to top Go down    Re: Sprag clutch on Mon Oct 01, 2018 7:33 am

gabriel


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Gold member
Hi
Fair point.
Not certain if a starter motor requires a certain amount of current and voltage to operate properly?


__________________________________________________
;BMW; 1984 BMW k100..frame number 6228?
    

10Back to top Go down    Re: Sprag clutch on Mon Oct 01, 2018 9:21 am

Point-Seven-five

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The reason I ask is that the classic sprag problem is failure to engage which results in the starter spinning merrily away whilst the engine just sits there.† I've never heard of a new battery correcting that problem.


__________________________________________________
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
    

11Back to top Go down    Re: Sprag clutch on Mon Oct 01, 2018 8:28 pm

gabriel


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Gold member
I was wrong about the sprague clutch..........


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;BMW; 1984 BMW k100..frame number 6228?
    

12Back to top Go down    Re: Sprag clutch on Mon Oct 01, 2018 9:08 pm

Two Wheels Better

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Is it ok for me to use Castrol optimal paste for ALL the splines?
Gabriel

Optimal is good stuff, and if you can mix it with Honda lube it's even better!


__________________________________________________
1987 K100RS, '93 K11/K12 hybrid 'Big Block', '09 K1300GT, '07 K1200R, '04 R1150RT, '95 R100 Mystic, '77 R75/7.
Have we accomplished half of what we dreamt we would? There may still be time.
    

13Back to top Go down    Re: Sprag clutch on Mon Oct 01, 2018 9:24 pm

Dai

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I use Optimol and found that it really didn't need replacing after two years and about 25,000 miles, but I did it anyway Very Happy


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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)
    

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