Bike shuts of while driving

Joined
Jul 28, 2024
Messages
12
Age
68
Location
Rovaniemi
My St1300 shuts of while driving. Dash and warning lights seem Ok and all the other electrinics as well. Sometimes it shuts of when start driwing and sometimes after driwing several km's. Starter runs but engine won't start. Waiting for a while engine starts again. Sometimes I can drive several days and thousands of km's without no cut offs. Last winter I tried to find cause off fault. I didn't find any burn't joints and when starting the engine in the carage engine runs nicely. No fault codes. I did replace crank shaft position sensor, but it didn't help. Anyone had same problems?
 
What are the load and no-load battery voltage readings?
What is the year and mileage?
Could it be the beginnings of alternator failure? Re-reading, makes me think the suspect alternator is less likely.
Failing fuel pump maybe? How does the fuel pump look?
 
Battery. I read your battery report 12.7 volts that is good charge rate.
This has happen to more than 1 st1300 owner/rider. on the left side of st under the tank is a large electric plug, near the front. It has a place were U canafix it to the lower fairing. Take a look at it. Pull it apart. Look the pins over for how clean. Or corrosion, blue/green in color. Wants the bike is running move the plug a wires around? Did the bike shut down? broken wire/loose pin? Randy, from NJ found this problem on fellow rider Bones bike at Moonshine. Search on site will give more details?
 
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What else goes off when the engine shuts down? Does the dash stay unchanged except the motor goes off? Headlights off, too, or do they stay on? Clock reset? Do you hear the fuel pump running?

There are a number of safety switches that could shut the engine off - tip over switch, engine kill switch, etc., though these usually show up as problems when you are trying to start the bike, not once it is running.
 
Battery
Grounds
Fuel pump
Speed sensor switch
Does the clock reset to 0100?
Just because you hear the fuel pump wind up and try to prime, does not mean it’s holding pressure.
Check fuel pump flow, and fuel line hoses.
 
What are the load and no-load battery voltage readings?
What is the year and mileage?
Could it be the beginnings of alternator failure? Re-reading, makes me think the suspect alternator is less likely.
Failing fuel pump maybe? How does the fuel pump look?
Hi
Voltage battery no-load 12,7V and charging voltage 14,7 V
Year 2006 European model, milage 35 tm. (50 tkm)
I think if it is pump or fuelfilter failure bike would not start once again and could be driven several thousend kilometers.
 
What else goes off when the engine shuts down? Does the dash stay unchanged except the motor goes off? Headlights off, too, or do they stay on? Clock reset? Do you hear the fuel pump running?

There are a number of safety switches that could shut the engine off - tip over switch, engine kill switch, etc., though these usually show up as problems when you are trying to start the bike, not once it is running.
Dash stay unchanged, clock in time headlights as well. Recovery after shut down is so qvick, that I haven't got enough time to get rid of helmet and hear if fuel pump is working or not. It would be much easier to locate fault if it would remain or if there would be some fault code.
 
Battery
Grounds
Fuel pump
Speed sensor switch
Does the clock reset to 0100?
Just because you hear the fuel pump wind up and try to prime, does not mean it’s holding pressure.
Check fuel pump flow, and fuel line hoses.
I have checked connectors and tried to find all the earthing points. But I have found only one below the fuel tank and the other one from battery negative to starter. Engine shuts off like you press shutdown switch on the right side handlebar. It looks like some of safety switches is not working propely. Maybe earthing problem?
 
I have checked connectors and tried to find all the earthing points. But I have found only one below the fuel tank and the other one from battery negative to starter. Engine shuts off like you press shutdown switch on the right side handlebar. It looks like some of safety switches is not working propely. Maybe earthing problem?
I think that there is an important earthing point near the headlight. I would load test the battery. I assume that the battery terminals are tight.
 
You should not run your starter for more than a few seconds at a time.
You need to check the voltage with the key on, hi-beams on, then while starting to make sure your battery is up to the job.
You should also open/clean both switch housings with some plastic safe contact cleaner.
There is another ground box (yellow) behind the right headlight.
What year and mileage on bike?
 
I confess to not knowing what tm or tkm is (ok, a typo for k = thousands? 50km would be about 31,068 miles). Regardless, the bike is young and barely broken in - engine time, not chronologically.
 
When mine would do this, it eventually turned out to be a fuel pump issue. It would restart almost immediately every time; has been fine since the pump was replaced, YMMV.
 
Hi
Voltage battery no-load 12,7V and charging voltage 14,7 V
Year 2006 European model, milage 35 tm. (50 tkm)
I think if it is pump or fuelfilter failure bike would not start once again and could be driven several thousend kilometers.
Please read #3 I post a possible problem? Thanks BoB
 
You should not run your starter for more than a few seconds at a time.
You need to check the voltage with the key on, hi-beams on, then while starting to make sure your battery is up to the job.
You should also open/clean both switch housings with some plastic safe contact cleaner.
There is another ground box (yellow) behind the right headlight.
What year and mileage on bike?
Battery seems to be Ok.
I have cleaned both switch houses and also wire connectors.
Is it so that there is only two earthing points (yellow ground box and frame earthing under the upper tank?
My bike 2006 and 35 tmiles (50 tkilomters)
 
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