BMW K bikes (Bricks)

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1Back to top Go down   K100 ignition coils on an Airhead BMW? Empty K100 ignition coils on an Airhead BMW? on Mon Jul 21, 2014 1:51 pm

brickrider

brickrider
Life time member
Life time member
I'm at wits end trying to resolve a problem with an R100RS (1983).  😕 There's a heat-related issue that raises the idle/tickover and causes rough running when hot. I've gone through the carburettors a number of times... nothing there that suggests they're the culprits. Now I'm wondering if the coil(s) are failing when they get hot. I've a set of coils from my K100. Could I plug them into the R100RS to verify if the presently installed coils are defective?  scratch  I want to avoid damage to related electrical bits on the R100RS, as I'm in no position to throw money at new parts just now. I'd rather be riding than repairing. TIA for any insights.

    

JGT

JGT
Gold member
Gold member
On my old R80RT, 1986, I had running problems with that when first bought. So converted back to points ignition with the 'bean can' and one K100 coil under the tank. Ran for 10 years in my ownership without a hiccup and no doubt is still running with this setup now. John


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1992 K75RT  1979 IZH Planeta3
    

3Back to top Go down   K100 ignition coils on an Airhead BMW? Empty Re: K100 ignition coils on an Airhead BMW? on Tue Jul 22, 2014 10:58 am

Two Wheels Better

Two Wheels Better
Moderator
Moderator
@brickrider wrote:I've a set of coils from my K100.  Could I plug them into the R100RS to verify if the presently installed coils are defective?  scratch  I want to avoid damage to related electrical bits on the R100RS, as I'm in no position to throw money at new parts just now.
Coils off an Airhead, circa 1983, are 1.5 ohms primary resistance. An 'early' K coil has about 2.6 ohms primary resistance. So, a short burst wouldn't hurt a thing, i.e., your Airhead's ignition module.



Last edited by Two Wheels Better on Tue Jul 22, 2014 11:04 am; edited 1 time in total (Reason for editing : Poor Latin usage)


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Sometimes I lie awake at night, and I ask, "What can I do to keep my life from going by so fast?" Then a voice comes to me that says, "Try slowing down at the corners." 

~Charlie Brown

1970 R60/5, '77 R75/7-R100, '85 K100'87 K75C, '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.

    

4Back to top Go down   K100 ignition coils on an Airhead BMW? Empty Re: K100 ignition coils on an Airhead BMW? on Tue Jul 22, 2014 12:44 pm

brickrider

brickrider
Life time member
Life time member
Thanks for the replies. 
I understand then, if the resistance is a tad greater, no short-term damage to the ICU is to be expected.  For optimal performance however, I should use coils of lower resistance. Correct?

    

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