09FE 450 running very lean

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BRN2RDE

Joined
Jan 22, 2008
Messages
70
Location
Southern Oregon
Anyone want to throw out some ideas why my 09 FE450 that I have ridden since new, is suddenly running very lean? It will start but not idle, has a fantastic bog, and pops and stuters when you rev it up. I had something similar a while back, and removing and cleaning the throttle body fixed the problem. This time however, I cannot seem to make the problem go away. Which of the sensors would cause this? Seems to be a bit inconsistent, sometimes worse than others...

Any guesses? I've got a race next weekend, and need to get this resolved right away!

Thanks,

BRN2RDE
 
Dirty fuel pump filter? Clogged injector? Cracked spark plug insulator?
Click to expand...

Problem seems to be inconsistent, so the first two seem unlikely. Cracked plug, bike would go rich, no? It is so lean now, the header goes red hot in just a minute of idling.

I am prepared to start buying parts...but need an idea where to start. Fuel injector, check. Sensor, which one? My local Husaberg shop just went under, and the nearest is now 4 hours away so time is critical.

BRN2RDE
 
Do you have any flash codes come up ? How may hours on the bike ? Mine lambda sensor has clocked off so the ECU has gone to open loop without throwing a code. In my case it runs rich and only requires a reflash to the closed course map and do away with the lambda sensor all together. You can check the various sensors TPS MAP air temp coolant temp etc but you need the breakout box to check lines between sensor and ecu. There is no info on the ignition system at all in the repair manual either, so if you gotta have it going I'd say bite the bullet and drag it up to the dealer and have the memory read out. I would try bergers suggestion first doesn't a really rich condition can make heat as well. ? I'm a ******* there are a couple of pages for ignition in the fault code section but no specific section.
 
Just had it apart again. I ran out of daylight before I got it all the way back together, so I did not test it. I cleaned the throttle body(again) checked and cleaned all the connectors. Took the fuel pump out and the screen was spotless. Before taking everything apart, I added fuel manually into the intake with the bike running and the lean out condition went away, so I am 100% concvinced it is a fuel issue. Still cant figure out why it is not getting the fuel it should...

Losing my local dealer is going to really suck. I have no doubt this is a simple fix, I just need to identify it. Driving 4 hours one way is not really part of my health and wellness plan.

Oh, bike has 2500+ miles and 130+hours, never had any serious issues.

BRN2RDE
 
That sounds like a fuel pressure issue. Check all the lines. I would pull the fuel pump out and stick it in a bucket. See if it pumps good. Try to set something up where you can run the bike while watching the fuel pump. The fuel return from the regulator goes right in to the module so you can keep an eye on the pressure coming out of the return. I would not pull the injector out unless you have new o-rings for it. These can be a *****.
 
I hear ya I have a 300km round trip to my dealer it sucks yeah but if ya gotta do it...... I remember reading in a thread here that some of the first bikes had bodgy fuel pickup screens that let crap into the system, so possible injector is crudded up.
 
Hi BRN2RDE
My 09 450 had almost 100hr eng started to have a lean backfire in the intake it would not happen very often
and for a long time it was hard to start warm always having to give it throttle to start
so I knew there was a problem
removed fuelpump the strainer on the bottom of pump it had some smal particals on it you could count them
in the hose from fuelp to pressure regulator there is a fuel filter removed filter and drained the contence into a jar
what came out of it was pond water (there was no water in the contence) with that much dirt in the filter injector
had to be dirty and or bad send the injector to guy that cleans injectors ultrasonicly he could only improve flow
2% and the injector would dribble so flter and injector was replaced and bike now runs and starts like it was new
no more backfire and feels more responsive
the only place that could have caused the dirt contamination is the air being sucked into tank as fuel is being used
I now have a filter on the vent hose it is clear so ican see how dirt gets into the filter
given the hours on your bike and the symtom it is a good chance that you have the same problem

later VIKING
 
Hi berglsmer
the object of the strainer on buttom of pump is to keep larger particles out of the pump
the filter after the pump filters the fuel 8-10 microns you could not do that on suction side of pump it will cavitete
and when it cavitates pump most likely overheat
you push more than pull thats plain fysics

later VIKING
 
Agreed but where is the filter on the discharge side of the pump on these bikes? I know gazza runs an inline can am filter on his rallye bikes. The profill in tank filters at least eliminate the hole the factory left in there so half the battle is won there.
 
Yes there is a filter on the discharge side of fuel pump Mahle KL 97 and will replace it every 50 hours

Later VIKING
 
OK, problem seems to be fixed. After taking everything apart, cleaning and re-assembling, replacing o-rings in fuel system, all seem to be OK. Of course I would feel better if I knew what the problem was, but I am happy to have it running right again.
As for the fuel filter issue, there is the screen on the end of the fuel pump, then there is a filter in the tank, directly after the pump. Is there any other filters? Seems like the most likely source of contanimation would be at the release fitting between the tank and the injector inlet. I don't see anything getting past the filter in the tank, but when servicing/removing the tank this connector would be an obvious spot for dirt to enter the system. What is the solution to this? I know one of you has one...

Brn2rde
 
Hi Guys,

Injectors are pretty reliable now days but there is always that chance of one getting some crap in it and as Viking points out in this thread they are not always easily cleaned, so I am going to invest in a spare to carry in the BB because you never know. :idea:

Steve
 
I dont think that the fuel line disconnect is source of potential dirt contamination unless you dont clean and lube
o rings as put it together
you could have case where you did seat the fuel disconnect thus creating low fuel pressure, it is hard seat the
fuel disconnect unless you lube the o rings
I dont think it would be practical to replace injector on the trail lost pontential for contamination into fuel sys
and the thing is that the source fuel filter is still dirty so now you have contaminated fuel injector
I think that preventing the dirt to enter and changing fuel filter bikes that spend time in dusty inviorment
should be change fuel filter more often
what supriced me was the amount of dirt in the filter and where I ride it is not very dusty except in the summer monhts so bikes that spend alot of time in dust should think about changing fuel filter often

laterVIKING
 
BRN2RDE said:
OK, problem seems to be fixed. After taking everything apart, cleaning and re-assembling, replacing o-rings in fuel system, all seem to be OK. Of course I would feel better if I knew what the problem was, but I am happy to have it running right again.
As for the fuel filter issue, there is the screen on the end of the fuel pump, then there is a filter in the tank, directly after the pump. Is there any other filters? Seems like the most likely source of contanimation would be at the release fitting between the tank and the injector inlet. I don't see anything getting past the filter in the tank, but when servicing/removing the tank this connector would be an obvious spot for dirt to enter the system. What is the solution to this? I know one of you has one...

Brn2rde
Click to expand...

So, did you end up changing the fuel filter in the tank? If you did, did you find that there was a bunch of dirt in the old filter? Another poster in another thread mentioned a filter screen at the injector, did you find any debris at the injector screen?
 

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