Fuel Mileage Problem - K-Bikes.com - Excellence in Motion
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post #1 of 4 (permalink) Old Jul 5th, 2006, 5:17 pm Thread Starter
Join Date: Nov 2003
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Unhappy Fuel Mileage Problem

Hey All,

Any ideas why my bike went from about 35 mpg to about 20 mpg? Driving speeds didn't change. Just commuting, maybe 80's on the freeway, but that was the same before and since.

Does the engine crankcase ventilation feed to the air filter? If I had too much oil in the c'case, could it have burped into the paper cartridge and partially plugged, causing drastically reduced fuel mileage.

I don't think that the ethanol-a-lene at 10 to 20 percent could have caused this drastic of a reduction, do you?

No warning lights lit. O2 sensor still in cat. Cat gets REAL hot.

What could it be????
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post #2 of 4 (permalink) Old Jul 8th, 2006, 6:54 pm
Join Date: Mar 2004
Posts: 402
Fuel leak?

I'd check the quick-disconnect fittings while the engine is running.
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post #3 of 4 (permalink) Old Jul 9th, 2006, 9:23 am
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Join Date: Nov 2004
Location: Newnan, GA, USA
Posts: 86
I have read others here state that a very hot CAT is a symptom of the bike running way to rich. That, of course, would explain the drop in mileage as well. The easiest thing to do, in my mind, would be to pull the air filter out and check it. Also check the hoses that route air into the air box and make sure they're clear.

I also seem to remember that the ECU can switch to a full rich mode in certain cases due to recieving a fault from one of the sensors (I don't remember which one). You might search the board for that.

Let us know what it turned out to be once you get it figured out.

Good luck.
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post #4 of 4 (permalink) Old Jul 9th, 2006, 2:11 pm
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I think full rich is when the O2 sensor is not working ie as when you first start up. The engine temperature sensor has a lot to do with it as well. But you would expect to see a build up of soot around the muffler exit if it was over rich. Have you pulled a spark plug and had a good look at it after a short run?

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