K75 stalled now won't start - K-Bikes.com - Excellence in Motion
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post #1 of 25 (permalink) Old Apr 28th, 2014, 9:07 pm Thread Starter
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Location: Providence, RI, USA
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K75 stalled now won't start

Hey all thanks for input in advance. I was riding home today 20 mi. at 60-75mph. on my 93-k75.
Just replaced clutch cable, adjusted to spec. 600miles ago.

Approaching a stop it started to stall, heard knocking, I clutched and it stalled. Started up and got another block, similar thing. I noticed once i popped into 2nd it ran smoother than in 1st. When I clutched, knocking began and stalled, clutch is engaging fine. but issue is now it won't start.

Pump pumps fine when disconnected (at tank), and return line is spewing gas when disconnected (at tank) and I press start button. Fuel flows from and back into tank. Have good power, engine cranks but won't start.

Weird thing, couldn't start it to relieve fuel line pressure, so just disconnected lines.
I noticed the bike starts up easily with the fuel line disconnected from rail (at the tank) and will run until it runs out of fuel in the rail.. . . Help, what should I be looking at? for?

Panhandling on Brooklyn Bridge for a spare clutch plate.
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post #2 of 25 (permalink) Old Apr 28th, 2014, 9:55 pm
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Location: Austin, Texas, USA
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Have you ever replaced the fuel filter? Sounds kind of like what happens when it gets stuffed full and won't pass enough gas.

Frank

'17 R1200RS, 2 yrs. 25,000 mi.
'16 R1200RS, 18 mo. 28,000 mi. (gone)
'03 R1100S Boxer Cup Replika 6/200
'85 K100/1100RS, 34 yrs. 326,000 mi.
'05 R1200ST, 8 yrs. 57,400 mi.-3rd deer killed it.
'11 R1200RT, 2 yrs. 30,000 mi. (gone)
'99 R1100S, 2 yrs. 15,000 mi. (gone)
'96 Ducati 900SS/SP, 12 yrs. (gone)
500,000+ BMW miles
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post #3 of 25 (permalink) Old Apr 29th, 2014, 9:24 am Thread Starter
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Yes, replaced it last season after a similar incident, but now the fuel line flows when I press the starter button, its weird, the bike will start normally if the fuel pump isn't powered. I was putting things back together last night and just fooled with that, starting the bike then plugging fuel pump in before the bike stalls, and it would bog down as i plugged in pump.

Panhandling on Brooklyn Bridge for a spare clutch plate.
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post #4 of 25 (permalink) Old Apr 29th, 2014, 9:36 am Thread Starter
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Could it be a lack of fuel causing it to stall? even though it is pumping somewhat? would that indicate need for a new fuel pump? necessary to check filter again
I renewed filter last season, after bike stalled and wouldn't run. didn't even bother checking filter when I saw gas flow from line when I disconnected it from fuel rail

Panhandling on Brooklyn Bridge for a spare clutch plate.
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post #5 of 25 (permalink) Old Apr 29th, 2014, 9:39 am
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Usual suspects:

1) Fuel level sender connector

2) Flaky ignition switch
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post #6 of 25 (permalink) Old Apr 29th, 2014, 10:34 am Thread Starter
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would the fuel level sender connection affect performance? or just telltale light
I'll check ignition connections, but it's odd to me bike started w/out tank, ignition issues?

Panhandling on Brooklyn Bridge for a spare clutch plate.
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post #7 of 25 (permalink) Old Apr 29th, 2014, 11:05 am
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The connector from the tank for the FLS provides power to the fuel pump.
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post #8 of 25 (permalink) Old Apr 29th, 2014, 11:40 am
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Quote:
Originally Posted by gullymonster
but it's odd to me bike started w/out tank
The injection system needs something like 30-40 psi fuel pressure to operate properly. Are you telling me that the bike runs without fuel pressure, but won't run with it?

Frank

'17 R1200RS, 2 yrs. 25,000 mi.
'16 R1200RS, 18 mo. 28,000 mi. (gone)
'03 R1100S Boxer Cup Replika 6/200
'85 K100/1100RS, 34 yrs. 326,000 mi.
'05 R1200ST, 8 yrs. 57,400 mi.-3rd deer killed it.
'11 R1200RT, 2 yrs. 30,000 mi. (gone)
'99 R1100S, 2 yrs. 15,000 mi. (gone)
'96 Ducati 900SS/SP, 12 yrs. (gone)
500,000+ BMW miles
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post #9 of 25 (permalink) Old Apr 29th, 2014, 11:54 am
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The round fuel tank power connector has given me trouble in the past. I took a pick (something very small but stiff) and used it on the female connections in the plug on the bike harness. VERY carefully try to close the gap in the connector pin, just a little more than it is. What you are trying to do is make a more positive/tighter connection when it is plugged back into the tank. Also check the wiring where it attaches to the back sides on the pins (think they are crimped) for any looseness or fraying. Unless you can verify your fuel pressure, I would replace the fuel filter. There are replacements to be had at auto parts places. 8mm/ 5/16 inlet and outlet and able to withstand higher fuel pressures.

Frank

'17 R1200RS, 2 yrs. 25,000 mi.
'16 R1200RS, 18 mo. 28,000 mi. (gone)
'03 R1100S Boxer Cup Replika 6/200
'85 K100/1100RS, 34 yrs. 326,000 mi.
'05 R1200ST, 8 yrs. 57,400 mi.-3rd deer killed it.
'11 R1200RT, 2 yrs. 30,000 mi. (gone)
'99 R1100S, 2 yrs. 15,000 mi. (gone)
'96 Ducati 900SS/SP, 12 yrs. (gone)
500,000+ BMW miles
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post #10 of 25 (permalink) Old Apr 29th, 2014, 12:25 pm Thread Starter
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I don't have a pressure gauge in this garage, so I haven't measured pressure to or from rail yet.

I disconnected the tank from the rail without depressurizing lines (because bike wouldn't start)
After I disconnected the line from the tank, the bike started and idled off what gas was in the line above the rail.

Upon reconnecting fuel lines, I let the pump refill lines, and then disconnected WIRING to pump, the bike starts and idles, but as soon as I reconnect electric clip, the bike bogs down.


-----Went in and Picked female connections in wiring clip.------ Female side has 3 spines inside each socket, so I pushed those to make it a little bit tighter fit, checked ECU connection tight, my clymer manual is at my parents garage, im stuck working out of the hanes one, not nearly as thorough. any more thoughts?

Panhandling on Brooklyn Bridge for a spare clutch plate.

Last edited by gullymonster; Apr 29th, 2014 at 1:42 pm.
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