Starter free spins on occasion - BMW Luxury Touring Community
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post #1 of 3 Old Apr 9th, 2014, 6:56 pm Thread Starter
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Location: Garfield Hts, Ohio, USA
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Starter free spins on occasion

I just had the tank off my 2004 KLT to do air/fuel filters and Jiffytite QD's. Got my fuel issues solved. But now notice every now and then last few days. First start attempt starter will free spin. 2nd attempt and thereafter it engages and starts trouble free. Relay maybe?

2004 K1200LT. Big Mama
1999 Suzuki Intruder VL1500LC. Betty Lou.
I'm a 4 percenter.
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post #2 of 3 Old Apr 9th, 2014, 7:09 pm
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Location: Railton, Tasmania, Australia
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Re: Starter free spins on occasion

If you are certain that the starter motor is actually spinning (powered up) then it is likely that the starter sprag (overrun clutch) is beginning to gum up and slip rather than grip the hub to turn the engine over. Plenty has been written about the issue here. Search starter sprag clutch. In the K100 days I always used a high detergent diesel engine oil and never did short runs, this ensured the engine oil always came up to operating temperature so reducing the chance of forming condensate and sludge, both enemies of the starter sprag.

1987 Yamaha TY250R
1991 Aprilia Climber 280
1988 K100RT (the pack horse)
2005 K1200LTE Light yellow metallic
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post #3 of 3 Old Apr 9th, 2014, 9:28 pm
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Location: Dandridge (Near Knoxville), TN, USA
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Re: Starter free spins on occasion

Sprag clutch slipping. That is one witch of a job to replace! Please don't ask me how I know. 8>)

You may be able to avoid ever replacing it though. Much has been written over the years, the easiest thing to try is running CD-2 oil detergent for some time, then changing the oil.

Also, you can pull the crankcase cover, and spray carb cleaner into the three holes in the sprag clutch housing. (Don't worry, you do not remove the crankshaft. That is the only picture I had with the crank cover off.)
A little hard to get to, but that should flush out most of the sludge in the clutch. Of course you would immediately change the oil before starting the engine.
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I don't want to achieve immortality through my work...I want to achieve it through not dying.

David Shealey
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EX: '01 Black LT, BAT BYKE (Totaled at 110,000 miles)
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