BMW K bikes (Bricks)


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1Back to top Go down   1985 K100rs 2v no spark Empty 1985 K100rs 2v no spark Fri Feb 03, 2023 5:29 pm

Zacdonov

Zacdonov
active member
active member
Hello i'm a new member from the United States currently in the process of restoring and modifying a k100rs. That recently has no spark tested from all 4 plugs.

I've spent years restoring and modifying this bike and had it running decent all last season. When it came time to put the bike away, I'm able to roll it from my garage into my spare bedroom with my other bikes to keep them warm lol. Changed oil, coolant, new battery, spark plugs. (I'm only mentioning this because i want members to understand this thing was stored proper so there wouldn't be any issues come spring.)

I began to rewire the entire chassis and injection harness using a motogadget mo.unit blue. Rewired and cleaned all chassis,gearbox,engine, and battery grounds with thicker cable which I've tested with a multimeter. Next i installed the mo.unit and began wiring the ignition with help from a proven diagram which i'll paste below.

http://forum.kforum-tech.com/members-upload/uploads/Updated-BMW-K100-M-Unit-Wiring-Diagram-by-Mikey-From-Piha.pdf

While i have the valve shims out and oil drained i have the starter outside the bike properly grounded and with ignition on I'm able to power and turn the starter motor. I've taken the plugs out one at a time and grounded them to the engine and while the starter engages alas no spark...

Maybe there is an issue with my wiring but I've been testing and triple checking the diagram i should be receiving spark. Is there anything else i should test that might have gone bad since storing like the Hall effect sensor? I have already replaced the ICU and it hasn't worked.

    

Zacdonov

Zacdonov
active member
active member
Wired the ignition into my new m unit and with the starter engaged i am getting no spark to all 4 plugs. Has anyone run into this issue when installing their m unit on an earlier K100rs 8 valve?

I'll post the proven diagram I've been following below. 

http://forum.kforum-tech.com/members-upload/uploads/Updated-BMW-K100-M-Unit-Wiring-Diagram-by-Mikey-From-Piha.pdf

    

3Back to top Go down   1985 K100rs 2v no spark Empty Re: 1985 K100rs 2v no spark Fri Feb 03, 2023 7:08 pm

Laitch

Laitch
Life time member
Life time member
This seems like a strange and hazardous way to determine ignition output. Maybe I'm under the effects of frigid weather coupled with heavy gravity here.



Last edited by Laitch on Sun Feb 05, 2023 4:13 pm; edited 1 time in total


__________________________________________________
1995 K75 90,000 miles
    

4Back to top Go down   1985 K100rs 2v no spark Empty Re: 1985 K100rs 2v no spark Sat Feb 04, 2023 5:52 pm

92KK 84WW Olaf

avatar
Life time member
Life time member
What is the story with the neutral light or the clutch lever switch?


__________________________________________________
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 49,200 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
    

5Back to top Go down   1985 K100rs 2v no spark Empty Re: 1985 K100rs 2v no spark Sun Feb 05, 2023 2:57 pm

Two Wheels Better

Two Wheels Better
Moderator
Moderator
Topics merged into appropriate forum section.


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1977 R75/7-100, '93 K11/K12 Big Block, '93 K1100RS, '95 R100 Mystic, '96 K1100RS, 2 x '98 K1200RS, '06 K1200R & '09 K1300GT. Projects: 1993 & '96 K1100RS, & the 2nd '98 K1200RS
    

6Back to top Go down   1985 K100rs 2v no spark Empty No spark Wed Feb 08, 2023 10:59 am

Kr4mo

Kr4mo
active member
active member
Zacdonov wrote:Have you tested for 12 volts on pin 10 of the icu.  Green/yellow wire from the kill switch.

    

7Back to top Go down   1985 K100rs 2v no spark Empty Re: 1985 K100rs 2v no spark Sun Feb 26, 2023 6:46 pm

Zacdonov

Zacdonov
active member
active member
Thought i would revisit this thread after solving the issue. My wiring was correct as i didn’t change anything except fully install the starter now the plugs receive spark. Makes sense the motor would have to be turning along with the starter in order for the icu to send a timing signal to the plugs.

    

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