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4/1/2008
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2015 KTM 350 XCF-w
Had the bike on the track today, it would do a couple laps and run great, then the bike would start to pop and cut out. Might even backfire hard a couple times before it totally died. Sounded almost like it was losing fuel as it would bog when I turned the throttle. Once the bike stalled, no electronics would function for 5 seconds, starter wouldn't turn, light wouldn't turn on.
After the 5 seconds was up, bike would fire but be under powered and prone to bogging and dying again.
Once the Bike would be totally cooled down, it would run great for 5 or so min and then repeat the issues.
Checked the Air Vent hose, fuel filter, no tank debris, plug cap was secured, oil levels good, filter box clean, all connections looked good around the bike. The Bike has also been run on VP t4 all 57 hours of it's entire life sans 1 gallon of gas once.
Drained the oil, no issues there either.
I have not checked the injector and the battery is a bit old and does need charged every week, but it had zero issues turning the motor over and over today.
Help please!
Had the bike on the track today, it would do a couple laps and run great, then the bike would start to pop and cut out. Might even backfire hard a couple times before it totally died. Sounded almost like it was losing fuel as it would bog when I turned the throttle. Once the bike stalled, no electronics would function for 5 seconds, starter wouldn't turn, light wouldn't turn on.
After the 5 seconds was up, bike would fire but be under powered and prone to bogging and dying again.
Once the Bike would be totally cooled down, it would run great for 5 or so min and then repeat the issues.
Checked the Air Vent hose, fuel filter, no tank debris, plug cap was secured, oil levels good, filter box clean, all connections looked good around the bike. The Bike has also been run on VP t4 all 57 hours of it's entire life sans 1 gallon of gas once.
Drained the oil, no issues there either.
I have not checked the injector and the battery is a bit old and does need charged every week, but it had zero issues turning the motor over and over today.
Help please!
I would suggest checking the voltage to the battery when running as it may not be charging correctly.
Paw Paw
PawPaw is on to something as usual also, I work on cars for a living and see this all the time (don't claim to be an expert but I do have some experience and like to help when I can). A bad battery or a vehicle with some kind of issue that drains the battery can cause all kinds of issues with the electronics. On certain vehicles it will make them run weird and kick on the CEL also and you'll be chasing miss fire codes, lean/rich codes for a while if you don't check voltage first. Our vehicles depend on certain voltages to certain sensors to get accurate readings in order for the vehicle to operate properly and if that is out of spec the computer goes crazy trying to compensate. Makes sense to me that our FI bikes could be the same way.
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Stator
Ecu
Regulator
Condenser
Coil
changed the ignition coil and it never died again.
I'm experiencing the exact same issue with the same bike as you.
Did you find and resolve the issue?
Also inspect the fuel pump and filter.
What about your battery?
Paw Paw
I adjusted the idle screw.
I have yet to inspect the fuel pump. How can the fuel pump be tested?
I have yet to replace the fuel filter.
I appears to happen once it's warmed up. As first it runs fine ( a few minutes), then sputters, backfires and stalls.
If the pump was going out sometimes the run time will be shorter overtime you start then
go out completely
See how long it runs
Paw Paw
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