BMW K bikes (Bricks)

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1Back to top Go down   Help needed to kill Gremlin Empty Help needed to kill Gremlin Sun Mar 31, 2019 9:41 am

Suzi Q

Suzi Q
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As title 
The Madass has had a gremlin for a few days and now won't play.
The load shedding relay (wired to earth through the starter as standard) had been doing 2 things: oscillating for a second after the bike fires up, before coming in as normal; and occasionally doing the same thing but for longer - maybe ten seconds or half a minute - whilst the bike is being ridden.

Bike has been starting without issues through this. Today it's decided not to - starter won't turn, and the LS relay won't come in, even before I press the starter button.

So, I stripped the starter, completely worn brush not properly contacting the com. All makes sense so far. However...

Do I just swap the starter (or brush if I can find one) because it's worn normally, or could this be a sticking starter clutch that's kept the starter spinning and worn the brush - would a spinning starter generate enough current to stop the LS relay working in this way? Stuck my finger in the hole as you do, and the starter clutch spins completely freely one way, and locks immediately in t'other, just like you'd want it to.

Votes for option 1 will be most welcome. Votes for option 2 will leave me unable to do the decorating as planned tomorrow, sigh.


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Sometimes I'm not really Suzi Quatro.
    

2Back to top Go down   Help needed to kill Gremlin Empty Re: Help needed to kill Gremlin Sun Mar 31, 2019 9:53 am

duck

duck
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How many miles on the starter motor?


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Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
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3Back to top Go down   Help needed to kill Gremlin Empty Re: Help needed to kill Gremlin Sun Mar 31, 2019 10:02 am

Suzi Q

Suzi Q
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No idea, can't remember where it came from. The other brush looks about half worn, everything else seems reasonable - bit of black dust, no sign of excessive wear, been catching fire - that sort of thing.

The flickering of the LS relay was at engine revs - is that back current? or is it the worn brush touching a high point on the com?

Hang on - still thinking this through, the LS relay normally comes in as soon as the starter button is released - all starters spin on for a second or so after release, so if they were capable of generating a beck current to hold the +ve terminal high and prevent the LS relay from coming in, then it'd be noticeable, wouldn't it?

Edit: A 'beck current' is the same as a back current, in my head at least.



Last edited by chris846 on Sun Mar 31, 2019 10:06 am; edited 2 times in total


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Sometimes I'm not really Suzi Quatro.
    

4Back to top Go down   Help needed to kill Gremlin Empty Re: Help needed to kill Gremlin Sun Mar 31, 2019 10:02 am

RicK G

RicK G
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Sounds like it needs a new set of brushes.


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"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

5Back to top Go down   Help needed to kill Gremlin Empty Re: Help needed to kill Gremlin Sun Mar 31, 2019 10:04 am

Suzi Q

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Okay cheers. Paintbrushes unfortunately.


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Sometimes I'm not really Suzi Quatro.
    

6Back to top Go down   Help needed to kill Gremlin Empty Re: Help needed to kill Gremlin Sun Mar 31, 2019 11:54 am

92KK 84WW Olaf

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Chattering load shed relay is your clue it aint the starter clutch.

That's good news.

Really does sound like a starter starter brush issue.

Brushes are easy to do on most Ks.....not sure how easy it is to get your starter out......


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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 0011171 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 37,190 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 42,640 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
    

7Back to top Go down   Help needed to kill Gremlin Empty Re: Help needed to kill Gremlin Sun Mar 31, 2019 12:05 pm

Two Wheels Better

Two Wheels Better
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Chris, have you checked the rear wheel shim?


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1970 R60/5, OZ '77 R75/7-R100, '85 K100'87 K75C, OZ '87 K100RS, '93 K11-K12 Big Block, '93 K1100RS, '95 R100-Mystic, '96 K1100RS, '98 K1200RS, '00 K1200RS, '02 K1200RS, '03 K1200GT, '04 R1150R'04 R1150RT, '05 K1200S, '06 K1200R, '07 K1200R, '09 K1300GT & 2013 R1200RT-Polizei  - Beemers owned still or sold.

~We all believe what we want to believe in - Rob Dickinson
    

8Back to top Go down   Help needed to kill Gremlin Empty Re: Help needed to kill Gremlin Sun Mar 31, 2019 1:14 pm

Suzi Q

Suzi Q
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I have a selection of rear wheel shims, naturally they're the first thing I try with problems like this.

The second thing I tried was a new starter motor. Oddly enough that had far more effect. Problem solved, no relay misbehaviour. Good call guys, 'preciate your input. Seems I was overthinking things as usual.

Cheers


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Sometimes I'm not really Suzi Quatro.
    

9Back to top Go down   Help needed to kill Gremlin Empty Re: Help needed to kill Gremlin Sun Mar 31, 2019 1:19 pm

Two Wheels Better

Two Wheels Better
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I savour a definitive fix. Goodonya.


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1970 R60/5, OZ '77 R75/7-R100, '85 K100'87 K75C, OZ '87 K100RS, '93 K11-K12 Big Block, '93 K1100RS, '95 R100-Mystic, '96 K1100RS, '98 K1200RS, '00 K1200RS, '02 K1200RS, '03 K1200GT, '04 R1150R'04 R1150RT, '05 K1200S, '06 K1200R, '07 K1200R, '09 K1300GT & 2013 R1200RT-Polizei  - Beemers owned still or sold.

~We all believe what we want to believe in - Rob Dickinson
    

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