BMW K bikes (Bricks)

You are not connected. Please login or register

View previous topic View next topic Go down  Message [Page 1 of 1]


1Back to top Go down   K75 Sprag clutch complete failure.  Empty K75 Sprag clutch complete failure. on Mon Nov 04, 2019 6:01 pm

jayk47

avatar
active member
active member
the sprag has eaten itself while in the engine.

The starter gear looks good and the bearing surface that the sprag dogs engage with all look good.

I will fit a new sprag ring but i probably wont fit a new gear. 

K75 Sprag clutch complete failure.  5d802a10
K75 Sprag clutch complete failure.  47e86d10
K75 Sprag clutch complete failure.  Img_7110 Thoughts opinions


__________________________________________________
Learning how to repair the bike i broke......
    

2Back to top Go down   K75 Sprag clutch complete failure.  Empty Re: K75 Sprag clutch complete failure. on Mon Nov 04, 2019 6:04 pm

92KK 84WW Olaf

92KK 84WW Olaf
Life time member
Life time member
I am in Cork. Not far from you.

But I have not heard of sprags disintegrating....


__________________________________________________
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 100,380 miles
1983 K100RS 0011171 Fricka 29,495 miles Damn K Pox Its a Bat outta Hell No 33,600 miles
    

3Back to top Go down   K75 Sprag clutch complete failure.  Empty Re: K75 Sprag clutch complete failure. on Mon Nov 04, 2019 6:37 pm

jayk47

avatar
active member
active member
@92KK 84WW Olaf wrote:I am in Cork. Not far from you.

But I have not heard of sprags disintegrating....
Hey Olaf!. 

You have now! Smile have now! Can't seem to find anyone who has had a similar experience on the interweb or much info about the freewheeling gear dimensions / v wear. Apparently it is difficult to assess the condition. £80 on Motorworks kind has me thinking that it'll be fine. Still, though, my thinking is, the sprag is buried so if I'm that far now I might as well replace.! 

I was warned by Andy Hourigan that the sprag was weak about a year ago when he had it for throttle bodies. Didn't expect it to obliterate itself. 

Have the sump off and have pulled out a few more chunks of cage and the little springs... 

J.


__________________________________________________
Learning how to repair the bike i broke......
    

4Back to top Go down   K75 Sprag clutch complete failure.  Empty Re: K75 Sprag clutch complete failure. on Tue Nov 05, 2019 4:43 am

92KK 84WW Olaf

92KK 84WW Olaf
Life time member
Life time member
Andy is pretty good with bikes and sees a few Ks.

Sprag clutches are well known to give out as in not work, but self destruct interests me as your one would or should have been the later one. If you do get a replacement clean it thoroughly as in leave it sit in some cleaner for a week to get it looking like new by removing the built up crap.


__________________________________________________
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 100,380 miles
1983 K100RS 0011171 Fricka 29,495 miles Damn K Pox Its a Bat outta Hell No 33,600 miles
    

5Back to top Go down   K75 Sprag clutch complete failure.  Empty Re: K75 Sprag clutch complete failure. on Tue Nov 05, 2019 6:25 am

jayk47

avatar
active member
active member
Hi Olaf.. 

I have gone for a new one from Motorworks, buried as it is I don't want to take the risk of using a secondhand part. 

It presented itself as a mechanical clatter when starting which I thought was the cush drive for the alternator wearing out but as it turns out it was the sprag eating itself. 

I have the sump off the bike and have pulled out a few bits of torn up metal from the sprag. Think i have it all out. 

Oil change and a new filter time i reckons..


__________________________________________________
Learning how to repair the bike i broke......
    

6Back to top Go down   K75 Sprag clutch complete failure.  Empty Re: K75 Sprag clutch complete failure. on Tue Nov 05, 2019 6:49 am

92KK 84WW Olaf

92KK 84WW Olaf
Life time member
Life time member
Are you sure its the sprag clutch and not the output shaft?


__________________________________________________
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 100,380 miles
1983 K100RS 0011171 Fricka 29,495 miles Damn K Pox Its a Bat outta Hell No 33,600 miles
    

7Back to top Go down   K75 Sprag clutch complete failure.  Empty Re: K75 Sprag clutch complete failure. on Tue Nov 05, 2019 8:50 am

jayk47

avatar
active member
active member
Hi Olaf.. 

Definitely. The ring gear exploded in the starter clutch assembly, thankfully the idler gear and the starter gear are all in good shape. Output shaft and flywheel are all good.. 

Turned the engine over by hand and no more bits fell out so that's good! im going to fit a magnet to the sump plug to mop up the rest of the debris. 

J


__________________________________________________
Learning how to repair the bike i broke......
    

8Back to top Go down   K75 Sprag clutch complete failure.  Empty Re: K75 Sprag clutch complete failure. on Tue Nov 05, 2019 10:10 am

92KK 84WW Olaf

92KK 84WW Olaf
Life time member
Life time member
Put up some close ups of it all, still curious on it all.


__________________________________________________
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 100,380 miles
1983 K100RS 0011171 Fricka 29,495 miles Damn K Pox Its a Bat outta Hell No 33,600 miles
    

9Back to top Go down   K75 Sprag clutch complete failure.  Empty Re: K75 Sprag clutch complete failure. on Tue Nov 05, 2019 11:08 am

jayk47

avatar
active member
active member
@92KK 84WW Olaf wrote:Put up some close ups of it all, still curious on it all.
There is a close up in the first post. 

 Basically it should look like this K75 Sprag clutch complete failure.  Screen10
But it looks like this... 
K75 Sprag clutch complete failure.  Img_7111


__________________________________________________
Learning how to repair the bike i broke......
    

10Back to top Go down   K75 Sprag clutch complete failure.  Empty Re: K75 Sprag clutch complete failure. on Tue Nov 05, 2019 8:19 pm

K75cster

K75cster
Life time member
Life time member
Must have been gum, and although it hadn't started the spin no start thing it must have been enough for a kickback to grab it and destroy it??


__________________________________________________
Keith - 1987 K75c with r100rt replica fairing and half of a 1984 K100rt 1992 K1100LT a blue one

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.
    

11Back to top Go down   K75 Sprag clutch complete failure.  Empty Re: K75 Sprag clutch complete failure. on Wed Nov 06, 2019 7:47 am

Dai

Dai
Life time member
Life time member
Messy....


__________________________________________________
'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)
    

View previous topic View next topic Back to top  Message [Page 1 of 1]

Permissions in this forum:
You cannot reply to topics in this forum