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Author Topic: k75 not starting  (Read 17075 times)

Offline Flick

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k75 not starting
« on: October 26, 2011, 07:27:08 PM »
I had the water pump and starter relay go out on me on Saturday. Now after fixing that she wont start, the engine spins and i get flames out of the exhaust. I have spark on all three cylinders, I have fuel, and the intakes look clear. I just can't figure out what is wrong now. Does anyone have any idea what might be going on?
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Offline johnny

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Re: k75 not starting
« Reply #1 on: October 26, 2011, 09:26:04 PM »
any chance its flooded...

j o
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  • :johnny i parks my 96 eleven hundert rs motobrick in dodge county cheezconsin  :johnny

Offline Flick

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Re: k75 not starting
« Reply #2 on: October 26, 2011, 10:08:15 PM »
I pulled the plugs, they were a little wet. I will let them dry on the bench overnight and see if it gets better by the morning. It's always the simplest problems that leave you stumped.
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Offline frankenduck

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Re: k75 not starting
« Reply #3 on: October 27, 2011, 12:15:14 AM »
K75s are pretty easy to flood compared to some other engines.
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Offline Roy S.

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Re: k75 not starting
« Reply #4 on: October 27, 2011, 02:02:59 AM »
Quote from: frankenduck on October 27, 2011, 12:15:14 AM
K75s are pretty easy to flood compared to some other engines.
Ya-butt thay arrr smooooov ruuuuuunin 8)
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Offline Flick

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Re: k75 not starting
« Reply #5 on: October 27, 2011, 11:01:32 AM »
Quote from: johnny on October 26, 2011, 09:26:04 PM
any chance its flooded...

j o

I put the plugs back in this morning and its still not starting.
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Offline kennybobby

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Re: k75 not starting
« Reply #6 on: October 27, 2011, 06:10:37 PM »
What caused the starter relay to go bad--was the battery nearly dead and the contacts welded closed during cranking? 

If so did you replace the battery? 

If you did not replace the battery, what is your battery voltage with the key out of the ignition? 

If the battery is fully charged and the voltage is less than 12.8 just sitting there you need to replace the battery.  Fuel injection will not work with a weak battery.
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Ridin' 87 K75S vin 1334,
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Offline Flick

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Re: k75 not starting
« Reply #7 on: October 27, 2011, 06:22:56 PM »
Quote from: kennybobby on October 27, 2011, 06:10:37 PM
What caused the starter relay to go bad--was the battery nearly dead and the contacts welded closed during cranking? 

If so did you replace the battery? 

If you did not replace the battery, what is your battery voltage with the key out of the ignition? 

If the battery is fully charged and the voltage is less than 12.8 just sitting there you need to replace the battery.  Fuel injection will not work with a weak battery.
The starter button stuck on. I have been using a car battery to test the bike. I just replaced the starter because it was burnt. the bike is spinning over much faster now but still nothing is happening.
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Offline Chaos

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Re: k75 not starting
« Reply #8 on: October 27, 2011, 11:51:26 PM »
Flames out the exhaust?   That ain't normal.  Valve or timing issue methinks.
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  • sw ohio
1987 K75S    VIN 0231
Original owner, Original litter
200,000 miles (plus or minus) and 5 paint jobs
sold 6/23
2023 Ural 2WD sidecar (BMW's bastard step child)

Offline Flick

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Re: k75 not starting
« Reply #9 on: October 27, 2011, 11:57:45 PM »
Quote from: Chaos on October 27, 2011, 11:51:26 PM
Flames out the exhaust?   That ain't normal.  Valve or timing issue methinks.

I just cant figure out how it would fall out of time while its setting
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Offline Flick

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Re: k75 not starting
« Reply #10 on: October 28, 2011, 07:52:33 PM »
So today's update.

Valve timing is good
Fuel injectors are good
all sensors are testing good
battery is good
coils are good
plugs are good

still not starting.

Unless someone in the Daytona Beach area is willing to let me use their K75 for a few minutes to check my ECUs I don't think i will ever figure out what is wrong.
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Offline pallum

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Re: k75 not starting
« Reply #11 on: October 29, 2011, 03:54:39 AM »
It's hard to diagnose such a strange problem, which is probably why I couldn't even think of the answer until now. I have had the same symptoms as you and fixed it with an ignition switch cleaning. Not sure how I haven't remembered this issue after all the trouble it caused me the first time, but it sounds just like what happened to me. At first it was intermittent, key on- crank but no start, key off, key on- crank but no start, key off, key on- starts right up.

Try hitting the brakes while you have the no start condition with the key still in the on position, if the dash lights dim (more than normal), the ignition switch is positively dirty.

If they don't dim, I'd clean out the switch anyways, easy insurance. ~30 minutes.
http://www.eilenberger.net/K75S/IgnitionSwitch/index.html
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  • Federal Way, WA
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Offline Flick

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Re: k75 not starting
« Reply #12 on: October 29, 2011, 03:03:29 PM »
IT LIVES!!!!!!

I found a guy that had written a page on fixing the EFI system on a K100. http://hrsbstaff.ednet.ns.ca/bvogel/K100/download/bike-wont-start.htm

As it turns out my TPS was the problem. With the sensor unplugged I got the bike to fire with the starter spinning the engine the choke on full and the throttle cracked open. After some fiddling with the sensor, I hooked it back up. Now she is running! The only thing left to do is put all the bits I took off back on.

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Offline Chaos

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Re: k75 not starting
« Reply #13 on: October 29, 2011, 03:29:51 PM »
Congrats!  At least you got the weather down there to enjoy it now  (50 and drizzly here :'( )
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  • sw ohio
1987 K75S    VIN 0231
Original owner, Original litter
200,000 miles (plus or minus) and 5 paint jobs
sold 6/23
2023 Ural 2WD sidecar (BMW's bastard step child)

Offline johnny

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Re: k75 not starting
« Reply #14 on: October 29, 2011, 05:39:50 PM »
tps... humm... plumb nertly... thans for the update...

j o
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  • :johnny i parks my 96 eleven hundert rs motobrick in dodge county cheezconsin  :johnny
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