F4 running fat - MVAgusta.net
 
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post #1 of 5 (permalink) Old 04-09-2009, 06:30 PM Thread Starter
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F4 running fat

I got the bike out for the first time this year and started her up. It fired up good but man is it running rich ! It's almost impossible to stand near the bike when it's running. Between the smell and the your eyes burning it's just not right.

Here's some history on the bike. The engine (2600 miles) just got installed this winter (by me) and I've only had it running a few times since. I don't know if something has been done to the ECU or if there's actually something wrong with it. Is there a way I can adjust the mixture or is it all controlled by the injection ? Is there something I've overlooked or something I've left unplugged perhaps ? No cat on the bike. It runs like a champ ! Starts right up and idles perfect, no hessitation in the throttle.

I'm open to suggestions. Thanks guys


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post #2 of 5 (permalink) Old 04-09-2009, 06:38 PM
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There is an air/fuel mixture screw on the ECU, near the EPROM. Check the FAQ (see links) for pics. Use a ceramic screwdriver if you have one to avoid shorting anything out especially if you have the ignition on when modifying the position.

Best to get it dyno'd at the same time, exhaust checked etc. so you know you've made positive adjustments.
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post #3 of 5 (permalink) Old 04-09-2009, 06:57 PM Thread Starter
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The ECU is form the 2007 1000R. No EPROM


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Take off your pants and jacket

01 750S W/1000R engine
01 Ducati 748 W/853 kit
03 Yamaha R1 (SOLD)
01 Kawasaki KX 125
88 Yamaha YSR 50
01 Yamaha R6
03 Suzuki DRZ pitbike
1982 Honda 110 atc
Yamaha PW50
1978 Honda 90 atc
2011 Yamaha Grizzly 700
2008 Yamaha Raptor 660
1975 Kawasaki G5 100
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post #4 of 5 (permalink) Old 04-10-2009, 02:38 AM
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Put a Co meter up the exhaust check the mixture.


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post #5 of 5 (permalink) Old 04-10-2009, 09:08 AM
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You need to adjust the idle fuel trim. You need the VDSTS tool and a CO meter. Adjustment is made with a computer, but is only done at idle. You cannot change individual fueling points.
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