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1Back to top Go down   K75 intermittent stalling Empty K75 intermittent stalling Mon Jul 11, 2016 4:35 pm

PasiVee

PasiVee
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Hi all,greetings from Finland!

a K75 c -87 (110K kms) began behaving oddly right after I took it out last May. Bike started immediately for a while until I switched her off. After that, no go. Starter motor turned but it sounded like something was wrong with the sprag clutch. Motor won´t start. Battery was sound, fully loaded. Decided to overhaul both starter motor and alternator. Checked also plugs and changed two gasoline hoses (tank to rail, return).  Opened all the under tank connectors ( not the handlebar switches connectors) and used Deoxit like stuff. Overhauled starter switch (thanks Don Eilenberger)but not the start button. Looked also into the relays  box, nothing loose nor corroded, no smell. Cleaned the tank inside, there was some black stuff, not plenty of it. Changed fresh gasoline.

And she started and run perfectly. Taking her to the road after 2 kms riding motor suddenly stalled just like if I had used the kill switch which I did not. All instrument  lights stayed on, and I could jump start it immediately, not even stopping first. 

Same has happened after that  two- three times. Just dying suddenly and (jump ) starting immediately.

Any idea where to look next? I think next I´ll let her run for one hour at our summer cottage to see if it´ll die or not, then try again on the road. If it happens only when riding, would that indicate loose connection?

Thanks for replying and excuse my english

Pasi Viitanen

    

2Back to top Go down   K75 intermittent stalling Empty Re: K75 intermittent stalling Mon Jul 11, 2016 6:27 pm

robmack

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Check and refurbish the ignition switch.


__________________________________________________
Robert
1987 K75 @k75retro.blogspot.ca
http://k75retro.blogspot.ca/
    

3Back to top Go down   K75 intermittent stalling Empty Re: K75 intermittent stalling Mon Jul 11, 2016 10:42 pm

kennybob

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If cleaning or replacing the electrical portion of the key switch doesn't work, then check the kill switch.

i think it's just one screw on the back of the right handlebar to open the compartment with the kill switch and starter button.  Clean the kill switch contact surfaces of the slider nubs and the ring and be very careful of the tiny springs.  If that sliding contact surface gets dirty it might behave such as you have seen, an intermittent contact--the hardest thing to troubleshoot.

    

4Back to top Go down   K75 intermittent stalling Empty Re: K75 intermittent stalling Tue Jul 12, 2016 1:15 am

duck

duck
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@robmack wrote:Check and refurbish the ignition switch.

What he said.

Or replace it.


__________________________________________________
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
http://www.ClassicKBikes.com
    

5Back to top Go down   K75 intermittent stalling Empty kill switch Tue Jul 12, 2016 2:20 am

PasiVee

PasiVee
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Thanks guys, I was actually beginning to check kill switch next. Never done that. Do You know any how-to´s?

    

6Back to top Go down   K75 intermittent stalling Empty Re: K75 intermittent stalling Tue Jul 12, 2016 4:32 am

92KK 84WW Olaf

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Instruments and lights etc staying on could be that darn connector to the fuel injection control unit under the seat. Check it out because I have seen it on a few and even had it on my own K100RT. The plastic retainer part can crack and leave it loose.


__________________________________________________
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   K75 intermittent stalling Empty Re: K75 intermittent stalling Tue Jul 12, 2016 5:27 am

WoodyAUK75

WoodyAUK75
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As others have said, check the electricals. Maybe the neutral switch or sidestand cutout. ( Did any have a sidestand cutout?) Unless of course you are revving past the limiter.

    

8Back to top Go down   K75 intermittent stalling Empty Re: K75 intermittent stalling Tue Jul 12, 2016 8:41 am

PasiVee

PasiVee
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Yes Woody the neutral switch must be cheked. And Olaf, EFI connector is OK, It clicks nicely and is steady. I think must refurbish the kill switch if stalling happens again.

    

9Back to top Go down   K75 intermittent stalling Empty Re: K75 intermittent stalling Tue Jul 12, 2016 5:39 pm

kennybob

kennybob
Silver member
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If it happens again, before jump starting and going on--can you check to see if the headlight is still on or off, also are the Instrument Cluster lights on or off?

It may be two separate contacts in the key switch--the headlight should be on with the key ON, but the IC lights only come on when the Kill switch is in RUN.  If you have headlights but no IC lights, then the Kill switch may be the culprit...but the ignition switch is still suspect due to the separate contacts.

    

10Back to top Go down   K75 intermittent stalling Empty Re: K75 intermittent stalling Wed Jul 13, 2016 6:31 am

92KK 84WW Olaf

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If my take is right the clutch switch or neutral light one or other is required for starting only. If neutral light is on then clutch switch is not needed. If you have no neutral light or are not in neutral then clutch switch is needed. But only to run the starter motor. Neither would cause a cut out.

Funny little thing too....on one of the K75s I encountered that problem we noted the low seat option seat protrusion underneath was pressing down on the FICU.


__________________________________________________
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
    

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