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1Back to top Go down   1995 K75 starter issue Empty 1995 K75 starter issue Thu Jun 01, 2023 5:18 pm

arbalest

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A friend has a 95 K75. On day he went out to start the bike, no start. Took it to the local BMW dealer and they told him it was the starter clutch....$3000. Any D.I.Y. fixes?

    

2Back to top Go down   1995 K75 starter issue Empty Re: 1995 K75 starter issue Thu Jun 01, 2023 7:17 pm

Point-Seven-five

Point-Seven-five
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I assume the starter just spins merrily without engaging the clutch to turn the engine over.  Is that a correct assumption?

If that is the case, I would remove a quart of oil from the crankcase and replace it with a can of Seafoam. 

Then do a back spin bump on the engine by pushing the bike backwards in 5th with the lutch pulled in and then popping it to bump the engine backwards.  This should loosen the pawls in the starter clutch so the engine can be started.  Then take the bike for a ride of about a half hour or more at highway speeds.  That should clean the crap out of the sprag so it will engage. 

Drain the oil and refill with Shell Rotella T6 full synthetic 15W40.  this is a heavy duty diesel engine oil that has heavy duty detergents that will help clean the engine.  You can use it for a couple oil changes and then go back to your regular oil or just keep using it, it won't hurt the engine.

If that doesn't work search on "sprag clutch" and you will find a plethora of other ways to get the clutch working again.


__________________________________________________
Present: 1991 K100RS "Moby Brick Too"
 
Past:
1994 K75RT "Ilsa, She Wolf of the SS"
1988 K100RS SE "Special Ed"
1994 K75S "Cheetos"
1992 K100RS "Moby Brick" R.I.P.
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

3Back to top Go down   1995 K75 starter issue Empty K75 starter issue Thu Jun 01, 2023 8:44 pm

arbalest

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Silver member
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Point-Seven-five wrote:I assume the starter just spins merrily without engaging the clutch to turn the engine over.  Is that a correct assumption?

If that is the case, I would remove a quart of oil from the crankcase and replace it with a can of Seafoam. 

Then do a back spin bump on the engine by pushing the bike backwards in 5th with the lutch pulled in and then popping it to bump the engine backwards.  This should loosen the pawls in the starter clutch so the engine can be started.  Then take the bike for a ride of about a half hour or more at highway speeds.  That should clean the crap out of the sprag so it will engage. 

Drain the oil and refill with Shell Rotella T6 full synthetic 15W40.  this is a heavy duty diesel engine oil that has heavy duty detergents that will help clean the engine.  You can use it for a couple oil changes and then go back to your regular oil or just keep using it, it won't hurt the engine.

If that doesn't work search on "sprag clutch" and you will find a plethora of other ways to get the clutch working again.

Thanks. This sounds doable.

    

4Back to top Go down   1995 K75 starter issue Empty Re: 1995 K75 starter issue Fri Jun 02, 2023 5:03 am

moriarti

moriarti
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Hi, depending on your spanner ability removal of the R/H  Engine cover and spraying WD40/brake cleaner or other. into the 2/3 holes in the sprag seems to give good results. If its high  millage you might have to do full stripdown to cure the problem. Very Happy


__________________________________________________
1984 k100 rs red/black VIN  0004449 Now sold to Olaf
    

5Back to top Go down   1995 K75 starter issue Empty Re: 1995 K75 starter issue Fri Jun 02, 2023 5:40 am

92KK 84WW Olaf

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arbalest wrote:A friend has a 95 K75. On day he went out to start the bike, no start. Took it to the local BMW dealer and they told him it was the starter clutch....$3000. Any D.I.Y. fixes?

I know its a lot of work to get at it if you are replacing it....but even at that a main dealer price of $3k sounds completely over the top. 

A summer of riding and oil changes as suggested, should get you out of the problem. When you get it running, as suggested a good long ride, but if you have hills near you, then killing the engine and trying the starter at frequent intervals also helps. Do it on a hill so you can just do a rolling start and try it again. I got a potentially difficult one out of trouble like that. A few frequent oil changes at about 1,500 miles [didnt change the filter each time] made a very big difference.


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011157 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 58,200 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 51,800 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 63,390 miles

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

6Back to top Go down   1995 K75 starter issue Empty K75 starter Fri Jun 02, 2023 7:19 am

arbalest

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Silver member
Silver member
92KK 84WW Olaf wrote:
arbalest wrote:A friend has a 95 K75. On day he went out to start the bike, no start. Took it to the local BMW dealer and they told him it was the starter clutch....$3000. Any D.I.Y. fixes?

I know its a lot of work to get at it if you are replacing it....but even at that a main dealer price of $3k sounds completely over the top. 

A summer of riding and oil changes as suggested, should get you out of the problem. When you get it running, as suggested a good long ride, but if you have hills near you, then killing the engine and trying the starter at frequent intervals also helps. Do it on a hill so you can just do a rolling start and try it again. I got a potentially difficult one out of trouble like that. A few frequent oil changes at about 1,500 miles [didnt change the filter each time] made a very big difference.

This has all been great advice. Thank you all. Hopefully I can help get the K75 back on the road (and save the guy $3000), using the info from this forum.

    

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