750 brutale won't rev correctly - MVAgusta.net
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post #1 of 18 (permalink) Old 11-01-2013, 01:18 AM Thread Starter
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750 brutale won't rev correctly

Hi guys, hoping the brains trust can guide me with my issues.
My 750 had a 42k service 1500 kms ago. As I commute I hadn't revved it much but in a spirited ride the other day I discovered the bike wouldn't rev past around the 9000 rpm range. Occasionally it would get to 10ish but wouldn't hit redline.
Hoping it was something simple I replaced the fuel filter. Prob remains and is gradually getting worse. Now it's struggling to get past 6000.
All fuel lines looked fine.
I've replaced the plugs just to make sure but it's no different. Could I have a bad coil?
The bike starts and runs perfectly until I up the revs or grab a big fist of throttle.
Anyone have a spare coil I can buy to try and isolate if that's the prob. Could it be a bad ecu? The spu has been replaced previously.
Thanks In Advance for any help/thoughts
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post #2 of 18 (permalink) Old 11-01-2013, 05:39 AM
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Originally Posted by boogla View Post
Hi guys, hoping the brains trust can guide me with my issues.
My 750 had a 42k service 1500 kms ago. As I commute I hadn't revved it much but in a spirited ride the other day I discovered the bike wouldn't rev past around the 9000 rpm range. Occasionally it would get to 10ish but wouldn't hit redline.
Hoping it was something simple I replaced the fuel filter. Prob remains and is gradually getting worse. Now it's struggling to get past 6000.
All fuel lines looked fine.
I've replaced the plugs just to make sure but it's no different. Could I have a bad coil?
The bike starts and runs perfectly until I up the revs or grab a big fist of throttle.
Anyone have a spare coil I can buy to try and isolate if that's the prob. Could it be a bad ecu? The spu has been replaced previously.
Thanks In Advance for any help/thoughts
Hi Luke.
If it was a coil mate, the bike would run on 3 cylinders or worse.
When you replaced the fuel filter, did you clean the strainer on the pump ?
Check the O-rings on the fuel lines for swelling.

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post #3 of 18 (permalink) Old 11-01-2013, 05:57 AM Thread Starter
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Hi Dons,
I'll have another look tomorrow. In my haste to do the filter, I noticed the strainer for the pump but couldnt see how to remove the pump to get to the strainer. I also used a non-standard filter (had correct inlet/outlet diameter but is a larger cannister in size over-all) - would this add to my probs? I guess I better slow down and look more carefully at the items you have suggested. Is there a trick to removing the pump?
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post #4 of 18 (permalink) Old 11-02-2013, 10:20 PM
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Luke, I have an ecu you can try, also have two different fuel filters that are know to work ok.

Where abouts in Sydney are you ?
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post #5 of 18 (permalink) Old 11-03-2013, 02:58 PM Thread Starter
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Hi mate,
I'm on the south side (the bubble)

Think my ecu is ok but would happily buy a fuel filter off you.
I work at the airport if that's any closer to you

Cheers
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post #6 of 18 (permalink) Old 11-03-2013, 07:16 PM
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My money is on degraded fuel lines or a blocked filter. Even though you just installed a new one, I would take the fuel pump assembly apart and check for degraded lines. Or you had some grunge in the old filter and when you removed it, some escaped into the fuel lines and now the injectors are clogged.
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post #7 of 18 (permalink) Old 11-04-2013, 02:00 AM
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Luke, I'll bring one to Pyrmont with me, can you get there during office hours ? I might be able to get over to the airport one day this week if not. Email me your details, my email is on my profile.

Cheers
Rich
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post #8 of 18 (permalink) Old 11-06-2013, 02:36 AM
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Luke, fuel filter is in my office at Pyrmont, shout if you want it.
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post #9 of 18 (permalink) Old 11-07-2013, 10:47 PM
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Thumbs down ? no fuel?

I'm with Carl and Donsy;
check your fuel lines (to be replaced every 3 years)
and the prefilter screen, I have pictures of one light barely goes through......the tank had pieces of rubber floating around that were being trashed by ethanol?

you could see them floating but you couldn't feel them

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post #10 of 18 (permalink) Old 11-08-2013, 04:11 AM Thread Starter
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Thx guys. More investigating this weekend hopefully. I'll report back any findings. Cheers
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