570 Started running poorly this morning

I'm having what sounds like a very similar issue with my 2010 FE570.
After initially starting fine, the bike will stall once warmed for 1-2 minutes. It becomes hard to start afterwards, and sputters/coughs. It has backfired as well. I thought that I had gotten a bad tank of fuel, contaminated with water. I removed the tank, drained it and flushed it repeatedly with alcohol, letting it dry overnight. I also checked the fuel fiters while the tank was empty and flushed, and they appeared spotless. I removed and checked the spark plug, and it looked fine. I've re-assembled, only to have the same symptoms...
Not sure what to check next. I'm thinking that I'll check the throttle body itself for any deposits, but I'm not sure that this will solve my issue. It seems that my issue is combined with temperature- once the bike warms slightly, the problem surfaces.
Any ideas?

MyRCRocks said:

I'm having what sounds like a very similar issue with my 2010 FE570.
After initially starting fine, the bike will stall once warmed for 1-2 minutes. It becomes hard to start afterwards, and sputters/coughs. It has backfired as well. I thought that I had gotten a bad tank of fuel, contaminated with water. I removed the tank, drained it and flushed it repeatedly with alcohol, letting it dry overnight. I also checked the fuel fiters while the tank was empty and flushed, and they appeared spotless. I removed and checked the spark plug, and it looked fine. I've re-assembled, only to have the same symptoms...
Not sure what to check next. I'm thinking that I'll check the throttle body itself for any deposits, but I'm not sure that this will solve my issue. It seems that my issue is combined with temperature- once the bike warms slightly, the problem surfaces.
Any ideas?

Click to expand...

Make sure that you have the cold start knob pushed in?

I just dunked my bike again, same place as last time too. It took awhile to start this time and my boots took a beating in the river rock and wast deep water.

Just thought I'ed share.

I always wash my 570 with the wash cap on. It's too easy to get water under the seat and into the intake.

DaleEO said:

MyRCRocks said:

I'm having what sounds like a very similar issue with my 2010 FE570.
After initially starting fine, the bike will stall once warmed for 1-2 minutes. It becomes hard to start afterwards, and sputters/coughs. It has backfired as well. I thought that I had gotten a bad tank of fuel, contaminated with water. I removed the tank, drained it and flushed it repeatedly with alcohol, letting it dry overnight. I also checked the fuel fiters while the tank was empty and flushed, and they appeared spotless. I removed and checked the spark plug, and it looked fine. I've re-assembled, only to have the same symptoms...
Not sure what to check next. I'm thinking that I'll check the throttle body itself for any deposits, but I'm not sure that this will solve my issue. It seems that my issue is combined with temperature- once the bike warms slightly, the problem surfaces.
Any ideas?

Click to expand...

Make sure that you have the cold start knob pushed in?

Click to expand...

It is.

Any other thoughts?

Try a new plug.

I would like to know what you back flushed the injector with !
Because you can only clean an injector using an ultrasonic bath with the proper cleaning fluid.

Today's trials and tribulations:

I pulled the throttle body and injector. The throttle body had some build-up of oily sludge below the butterfly. The injector had a thick layer of white crust on the outside. I soaked the injector (inside and out) with injector cleaner and cleaned the throttle body thoroughly. I re-assembled, and fired up the bike. Again, the bike idles for 2-3 minutes and then stalls. Next thoughts are to check the temp sensor, and fuel pump pressure... After that, I'm not sure where to go...

So I had some success today!
My buddy has the same bike and brought it over, giving me the opportunity to swap parts back and forth to verify my efforts.
I had flushed my fuel tank, lines, and injector using a cleaner and then alcohol. We verified flow patterns by removing the injectors but leaving fuel lines and electrical connectors attached, and then thumbing the starter with the injector pointed into a safe container. All seemed well. We swapped temp sensors. Same issues persisted. The final piece to the puzzle was a simple spark-plug swap. I had dismissed the plug, having had it out last week when I checked my valves, and it looked great. We swapped them out today, and my plug was black and crusty... likely due to conditions caused by the tankful of watery sludge I had recieved at a local trailside gas stop... Anyhow, after swapping the plug for my buddy's, I managed to get in a 30km run without a hiccup... This is the longest my bike has run since getting the poor fuel... I don't want to jinx myself, but I think my issues are solved... Thanks to all for suggestions and advice.
Sorry to SERPEXC for the thread hijack!

I've been having the exact same problem with my 390. I mean exactly (starts, won't idle for very long, coughs, and dies). Since my Husaberg dealer is 4 hours away I took it to the local KTM shop and asked them to check my fuel pressure. Pressure is good. I asked them to check the TPS. It is good. I asked if they had any other ideas. They told me to take it to the Husaberg dealer.

My spark plug was new as of two ride ago. However, after reading your post, I figured WTH? That was it!! I haven't taken it on a full ride but I rode it around the yard and neighborhood. I really think it was the freaking plug!

Good to hear you had success, it seems that just because the bike is EFI we seem to over complicate troubleshooting. Funny how we can mis interpret symptoms of different problems.

berglsmerg said:

Try a new plug.

Click to expand...

berglsmerg said:

Good to hear you had success, it seems that just because the bike is EFI we seem to over complicate troubleshooting. Funny how we can mis interpret symptoms of different problems.

berglsmerg said:

Try a new plug.

Click to expand...

Click to expand...

I agree, but i think the new plug was the final piece of my puzzle, given the tankful of watery sludge I was able to purchase at $1.09/L trailside... My entire fuel delivery system needed loving first...

Copy that guess it would be a good excuse to lash out on a 70 degree sub tank ! Do you run a filler neck filter ?

berglsmerg said:

Copy that guess it would be a good excuse to lash out on a 70 degree sub tank ! Do you run a filler neck filter ?

Click to expand...

A sub tank is in my plans for the winter. Perhaps I should add a filler neck filter to the list as well...