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. Don’t 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 ….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/
    

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