1986 K75 C - Dies while riding on freeway - K-Bikes.com - Excellence in Motion
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post #1 of 2 (permalink) Old Jul 11th, 2014, 12:40 pm Thread Starter
Join Date: Jul 2014
Location: Antioch, CA, USA
Posts: 1
Unhappy 1986 K75 C - Dies while riding on freeway

Hello Everyone,
I was wondering if anyone could offer some direction in an issue I am having;
I recently purchased an '86 K75C, I was finally able to take it on a more lengthy ride- that would have been roughly 60 miles long (one-way). About 25 miles into this trip, riding along at ~70MPH, the bike just died, dash lights all illuminated, and I held in the clutch and begged drivers to not run me over, as I crawled to a stop on the shoulder. The ambient temperature outside was around 80 degree's and the bike did not appear to be overheating, I attempted to re-start the bike immediately, the starter engaged but it wouldn't start, I tried again right after that - still nothing... five minutes later I tried again and it started, I pegged it as a fluke and kept riding. Roughly 5 miles later, same thing, this time it backfired (not really loud, but noticeable). - So this time I waited ten minutes and the bike ran for about 8 miles until It died again. I eventually made it back home after it dying about six times. The bike doesnt really seem to have a problem riding around the city at slower speeds - I had it die once right after I got off the freeway (at a slower speed) but I don't know if that is at all helpful to troubleshooting this issue.... I was reading a few other stories online today about similar instances - some finding issues with faulty fuel pumps, others had wiring issues with the fuel pump - then there were some water temp switches and wiring - and some had issues in the relay box. Now each of the stories I went through all had slight variations and weren't exactly my story - but similar...
I don't want to just start throwing parts at it, so I am looking for someone who might have had a similar experience to point me in the right direction.
Now a little back story - This is my first K bike, I bought it about two weeks ago from someone who hadn't used the bike regularly for about four years - he ran it and kept the fuel tank clean, but other than that - he never rode it. The bike has roughly 66k miles, and is in overall excellent cosmetic condition. I have flushed and changed all of the fluids and spark plugs. I got the bike fairly cheap - and he had proof of a recent spline lube/inspection.
I am about to go outside and look at the wiring - but I don't to rip anything apart until I research more - or get a response here.

anywhoo- I thank you in advance for any direction that you give. Have a good day!
olfson is offline  
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post #2 of 2 (permalink) Old Jul 11th, 2014, 4:16 pm
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Join Date: May 2011
Location: Fredrikstad, , Norway
Posts: 181
Sounds like a hall sensor problem. To verify remove the T-shaped cover in front of the engine, let the engine idle while heating up the area where the hall sensors and wiring sits using a hair dryer.
If the hall sensor(s) or related wiring is the problem, the engine will stop after a rather short time.

You also find plenty of info about this (rather common) problem on this forum and the net......
Search Hall sensor problem K75/100 or HES problem K75/100.
IngeK is offline  

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