F4 fuelling/injection issue - MVAgusta.net
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post #1 of 13 (permalink) Old 05-08-2013, 03:32 PM Thread Starter
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Thumbs down F4 fuelling/injection issue

Came back a few hours ago from a 100 km trip and I feel the bike is not running properly.

Engine is not running smooth; when accelerating from a stop it feels like there is not enough fuel going into the engine. Revs don't rise as fast as they should and I have to give it more gas to get going.

Afterwards the bike pulls, but not in a smooth, linear way. Also sounds a little strange, when I close the gas, there are slight vibrations from the engine.

I went up to 280 kph and the bike would keep pulling. When revving the engine the sound is just not right.

I have done 5400 km, the spark plugs, EBS relay and air filter have been replaced last year, around 1500 km ago.

Has anybody experienced similar problems? What could it be? A week ago it rained for a few minutes on the bike, could this have anything to do with it?

If I get a Microtec ECU, would this solve the problem?

Thanks in advance for your advice.

PS. The bike is an F41000S from 2005.
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post #2 of 13 (permalink) Old 05-08-2013, 03:37 PM
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What do you mean it doesn't pull in a smooth linear way?
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post #3 of 13 (permalink) Old 05-08-2013, 04:06 PM Thread Starter
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Revs don't rise as fast and as consistently, you get a small delay (fraction of a second) between opening the gas and the revs going up at low to medium rpm.
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post #4 of 13 (permalink) Old 05-08-2013, 06:07 PM
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When was the last time you changed the fuel filter ?

Have you ever had your fuel injectors cleaned ?
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post #5 of 13 (permalink) Old 05-09-2013, 03:03 AM
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Its your EBS valve relay, go buy another one. Relocate it to the left side of your frame, just below the venting holes at your left knee.

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post #6 of 13 (permalink) Old 05-09-2013, 03:33 AM Thread Starter
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Quote:
Originally Posted by MvCharacter View Post
Its your EBS valve relay, go buy another one. Relocate it to the left side of your frame, just below the venting holes at your left knee.
Thats exactly what I did last year, 1500 km ago.

The bike runs at about 80% of its performance. Today in town she was feeling a bit like running out of air.
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post #7 of 13 (permalink) Old 05-09-2013, 03:37 AM Thread Starter
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Quote:
Originally Posted by george4337 View Post
When was the last time you changed the fuel filter ?

Have you ever had your fuel injectors cleaned ?
Hmmm never... Thanks for the info, I will definitely do this.
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post #8 of 13 (permalink) Old 05-09-2013, 05:13 AM
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Unless your air filter is blocked, it's probably not running out of air. I think running a little fuel injector cleaner is a good idea, but I would also change the fuel filter.

If the bike is a 1000s and it has 5400km on it, that means it doesn't get ridden much. Fuel that has been in the tank for long time between fill ups can degrade. If it has ethanol blended with it, it has been eating at the rubber hoses. Drain the tank, remove it from the bike, and remove the fuel pump assembly. I'll bet your problem is there.
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post #9 of 13 (permalink) Old 05-09-2013, 12:37 PM
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Wink

replace fuel filter and fuel lines....and for good measure have the injectors cleaned....the bike has been sitting all its life

the lines are to be replaced every 3 years (per the manual)

Carl the air filter has 1500km on it

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post #10 of 13 (permalink) Old 06-02-2013, 09:27 PM
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Can anyone tell me how difficult it is to remove and clean the injectors on a 2010 F4?
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