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November 16th, 2009, 10:24 AM   #1
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'09 FE450 high fuel consumption (resolved)

At a race yesterday I went 48 miles and used up a full tank + 1 gallon from a pit stop and still ran out of gas 1/4 mile from the finish. I used to get about 40 miles per tank (2.2 gallon), but yesterday I only got 47.75 miles out of 3.2 gallons. I am getting no errors on the FI light, but something is wrong. I pulled the plug and it it is very dark, nearly solid black. Could it be a faulty sensor? The bike runs fine.
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November 16th, 2009, 10:49 AM   #2
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RE:

it may just be the picture but that plug looks fine.

someone with a bit more experience of teh new bikes should be along soon
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November 16th, 2009, 11:54 AM   #3
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Tell us some background please. What were race conditions and what level you ride.
I imagine a AA rider at race pace in poor terrain may get that kind of mpg. Maybe some of the pro"s can give us the mpg results.
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November 16th, 2009, 12:44 PM   #4
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How dirty was the air filter?
Anything restricting the Exhaust? Dings in the Exhaust? The spark arrester in the Exhaust clogged?
Did the bike feel on song or was it down on power?
Change the plug anyway it’s cheap

I wonder if Dealers have a diagnostic tool that plugs into the EFI Computer and can display the sensors outputs so you can see what the readings are? There are only a few key sensors in an EFI system:
Air Temp (Diagnostic tool should show a value in Degrees C or F)
Coolant Temp (Diagnostic tool should show a value in Degrees C or F)
MAP (Diagnostic tool should show a value in KPa or PSI)
Throttle Position sensor (Diagnostic tool should show a value in percentage of throttle opening)
Oxygen Sensor (Hard to check this one for accuracy unless it is completely dead, best to just replace if you think faulty)
There may be an Atmospheric Sensor too. Some EFI systems use the MAP sensor to check Atmospheric pressure just before the engine starts turning over. Works out if you are at Sea Level or way up in a mountain where the air is thin

If the Coolant Temp Sensor was faulty and indicated the engine was cold it would make the bike run richer and use more fuel. Or if the wire had fallen off the Coolant Temp Sensor, but I am not sure if this would make the EFI Computer think the bike was cold, or hot, or if the EFI Computer would just turn the fault light on.

There should be a Fuel Pressure regulator in the fuel system somewhere. If that is faulty and supplying more pressure the bike will run rich. This needs to be checked with a Fuel Pressure Gauge (Old School). Some Fuel Pressure regulators have a little air hose that runs back to intake manifold, if this hose is split the regulator will see no vacuum and think you have the throttle wide open and supply more fuel pressure. This will result in more fuel used, but I think you would notice the bike a little off song if this was the case.

Any rubber boots in the intake system that may be split?

Was it a cold day? If the coolant thermostat was faulty and stuck open and the engine was running cold, the Computer would compensate and run the bike richer.

Chassis Dyno and Exhaust Gas Analyser would check the Air Fuel Ratio in the exhaust to tell you if it is running rich. I have used Innovate LC1 and Autronic Exhaust Gas Analysers with great successes in Cars and Boats but never a bike.

I have only drooled over a Fuel Injected Husaberg in the shop, so have no idea about their EFI system. I have wired up a few Autronic EFI Systems in Cards and Boats
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November 16th, 2009, 12:50 PM   #5
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The race was very hilly, 2nd-4th gear terrain, not very tight. I race in the A-level classes (usually top-5 in my class). Others of similar speed (including me) have been getting about 40 miles per tank. The bike has 70 hours on it. Recently it started smoking at startup and at high-rpm, which looked like oil smoke (white with a little bit of blue tint). I tore the engine down and replaced the cylinder/piston/rings/valve seals because of a cylinder gouge from an earlier incident. After reassembling the smoking problem was still present. Around the same time I noticed the smoking problem I also noticed increased fuel consumption. I have noticed no loss of oil. I checked the plug after the race and it is nearly black, much more so than it looks from the picture.
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November 16th, 2009, 02:01 PM   #6
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Fresh air filter, no restrictions in exhaust, no dents in header or anywhere. It had a brand-new plug in it. It felt fine power-wise but did seem to stall a little easier than normal.
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November 16th, 2009, 02:06 PM   #7
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Re: '09 FE450 high fuel consumption

Originally Posted by littlerm
At a race yesterday I went 48 miles and used up a full tank + 1 gallon from a pit stop and still ran out of gas 1/4 mile from the finish. I used to get about 40 miles per tank (2.2 gallon), but yesterday I only got 47.75 miles out of 3.2 gallons. I am getting no errors on the FI light, but something is wrong. I pulled the plug and it it is very dark, nearly solid black. Could it be a faulty sensor? The bike runs fine.
Definitely not right. I am assuming its US gallons so that equates to less than 4 miles per litre.
Mine has 70 hours on it and racing flat out i tend to get at least 6 miles per litre or 48-50 miles per tank. Thats on aggressive mapping , you may get slightly less on a softer mapping.
If the bike is running ok, i would be checking things like a fuel leak somewhere, maybe thro the pump plate screws into the plastic or connection on fuel hoses.
Have you checked that the idle screw is pushed in ?
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November 16th, 2009, 02:26 PM   #8
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RE: Re:

Yep, idle knob is pushed in, no leaks anywhere. I will pull the coolant temp sensor tonight and test it.
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November 16th, 2009, 05:08 PM   #9
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RE: Re:

I've read on here before about others getting 50 miles per tank, but I've never gotten close to it. I usually plan on 35 -38 per tank before pitting. Are you sure you got all of the extra gallon? I race a 09 450 and regularly compete with two others on the same bike (you know what I mean) and none of us will try to push 40 miles. I hope you find more mpg's and let us all know (or at least me).

I've also assumed that the performance setting was one of the reasons for the low mileage. Does standard setting get worse mileage?
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November 16th, 2009, 11:34 PM   #10
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RE: Re:

probably not possible but you need to fool the bike in to leaning it off a little.

things that lean a bike off are:
it thinks it is very warm
it thinks it's not under load when it really is
it thinks the tailpipe is closed but it's really open

maybe a sensor is damaged?

regards

Taffy

just ideas.
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