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Discussion Starter #1
Hi folks,

I am brand new to the forum and a very recent new owner of a 2005 Brutal 910s.



I bought the bike this weekend and unfortunately on the ride home it started to cough and hesitate.



I had a 30 mile ride home on mostly motorway. After about 5 minutes in, I was pulling away at lights and it was incredibly jerky, i.e. power, no power, power, no power.

It gradually accelerated and once at full throttle it would pull ok.



I pulled over, did visual checks and no issue. She was idling fine.

I joined the motorway and again, hesitation. I managed to tickle it up to 70-75mph and managed to have it sit there without any issues until I got home.



I’ve tried to run it again this morning believing it might just be old fuel (I then filled with 98 ron petrol), still the same issue, if not worse.

Really hesitant and running rough. I’d conclude that the issue is worse when the bike’s cold.



I’m gutted and the seller clearly would have known there was an issue. I am hoping that it’s a small issue, maybe a faulty lead or fuel pump?



Anyone have any clues and be able to assist?

I’ve swapped a fuel pump before so I am happy to tackle this, but I wondered if this forum might know of any quirks or faults that sound similar to the above.



Thanks in advance
 

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Hello and welcome,

Sorry to hear that your first ride wasnt as expected.
I for one cannot help you, but im sure someone will come by and be able to understand and help with the current "issue"

Post a picture of the bike though :D
Just drag the photo from the folder its in to underneath the quick reply box.
 

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Hey Tiddsey, welcome to the family firstly and really sorry to hear about your first experience.

First things first, please put your location and bike model in your profile - super helpful to us in the forum. (although you did state you've got a 910s in the text).

There is decades of information and hundreds of years of experience so the SEARCH function will provide tremendous value.

As you probably know, without a known history to the bike then it's generally a process of elimination ...especially where ignition/fuellng is concerned.

We don't know how long the bike has been sitting around unused and how long that fuel has been there.

1. It's unlikely to be the fuel pump but could be the submerged internal fuel filter (inside the tank attached the pump)
2. Your internal fuel lines may have eroded slightly
3. Your description doesn't sound like it's missing a cylinder - but don't rule out a faulty coil (the generation 1 bikes wont tell you if you have a coil fault)

Credit to SilentService for the drawing - thanks Chuck


I'd start with fueling...
 

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I can't take credit or the drawing...I'll pass that on to @Donsy.

But, I will second the notion that fuel lines and the filter certainly need to be checked. The shown tank is a US version of an F4 system. The 910S is very similar.

Here is the Euro Version of a 910 tank (note the dual o-rings)

1.jpg

Here is the US version:

2.jpg

Here is a close up of the Evap Canister:

3.jpg


You can download your manuals free here: Team Double 3 Racing | MV Agusta Just scroll till you find that which you seek....and then give @Donsy a virtual hug and a beer!
 

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Welcome to the family !!! Where are you on the planet?

You might also look at spark plugs.... but I agree that the filter and internal fuel lines are first inspection. Plus you have to take off the tank to get to the plugs anyway.

I will wager it is something very simple. The 910 is a great bike. Yours has the 1.6M ECU, so the chip can be exchanged to change fuel and ignition maps. Do a search for Merc07 .... The forum's resident "chip master".
 

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Discussion Starter #6
Thanks for the quick and comprehensive replies, really useful information. It's comforting to have this kind of support on a forum for such an 'exclusive' brand of bike!

Ironically I also have an Aprilia pegaso as a commuter and i had very similar problems. After the fuel pump failed altogether, I replaced and changed the fuel lines which came with the replacement pumps ensemble. Turned out they were incorrect lines and the clamps cut into them and they split. The subsequent symptoms were incredibly similar to those I'm experiencing with the Brutale.

I'll whip the tank off and check all the lines and most likely replace the filter. I believe this is the correct filter?

https://www.ebay.co.uk/itm/Genuine-MAHLE-Replacement-Engine-In-Line-Fuel-Filter-KL-145/232660043596?ssPageName=STRK:MEBIDX:IT&_trksid=p2060353.m1438.l2649

I'll also check the spark plugs and visual check the coil and lead.

Shes a bit long in the tooth at 30k miles, but when it was running steadily, it sounded incredible!
 

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Tiddsey - I agree with the posts above that it could be a fuel system issue as discussed. When I encounter this kind of stuff, I go back to all the basics and try to "zero time" the bike. Battery voltage, electrical connections, grounds, dirty stuff, modifications, plugs signs of burnt or overheated components etc etc. This bike has 30k so it is not close to being new, so you just have to check everything that could possibly affect the fuel and ignition systems and that means all the "stupid stuff" as noted. Don't overlook the obvious
 

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One more comment. My riding buddy yrs ago bought for almost no money a perfect Tri Sprint RS. Three dealers could not get it to run right so they got rid of it.

The problem? The fuses in the fuse panel had worked themselves upward, causing various intermittent electrical issues. But you could not really see this by looking at the fuse panel. The fix? He pushed all the fuses back in and the bike has run perfectly ever since.

Don't overlook the obvious.
 

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Discussion Starter #9
One more comment. My riding buddy yrs ago bought for almost no money a perfect Tri Sprint RS. Three dealers could not get it to run right so they got rid of it.

The problem? The fuses in the fuse panel had worked themselves upward, causing various intermittent electrical issues. But you could not really see this by looking at the fuse panel. The fix? He pushed all the fuses back in and the bike has run perfectly ever since.

Don't overlook the obvious.
Thats actually a very interesting point and reminded me of another little issue that completely slipped my mind. Once I came off the motorway down to lower speeds (30-40mph) the bike 'glitched' for a split second and the speedo stopped recording speed. The bike continued to run, and the tacho continued to work but the speedo read '0 mph'.

It continued like this for about 5 minutes, only when I opened the throttle and got up to higher speeds it jumped back to life again and started working as normal.

Related?!
 

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Hello & Welcome

Sorry to hear of your problems.

I was interested to hear that you have two bikes that suffer from the similar problem. Can I ask, do you get your fuel from Supermarkets? I have had problems with fuel from Tesco and I only use Shell or BP now. This might be a contributory factor to the problem?
 

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That is the correct filter...and a good price.

Take your dash off and clean the multi-pin connector and then reassemble.
 

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Ironically I also have an Aprilia pegaso as a commuter and i had very similar problems. After the fuel pump failed altogether, I replaced and changed the fuel lines which came with the replacement pumps ensemble. Turned out they were incorrect lines and the clamps cut into them and they split. The subsequent symptoms were incredibly similar to those I'm experiencing with the Brutale.
Tid - Woe unto thee if you do not use the correct fuel lines in a submersible fuel delivery system as we have here.

Here's a Ducati post that discusses the correct hoses and where to get them

https://www.ducati.ms/forums/241-tech-forum/720853-st4-tank-fuel-hose.html
 

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@Rob Caso: Why wouldn't you reference the many threads that exist within MVAGAUSTA.NET?

Additionally, the referenced hose is the wrong dimension to prevent slipping off the fuel pump outlet. That means the referenced price is also wrong.

The Ducati uses, as does the MV (because the design is identical) J30R10 Gates hose in a 5/16" ID. The 3/8' will be too loose and you will eventually end up stranded on the roadway.

Why did the Ducati Forum reference 3/8"? Because it is cheaper to buy and more plentiful...but it will cause problems down the line.

The 5/16" correct diameter is also more expensive if you buy it by the foot...at about $29/foot, so I buy it in bulk and make it available to the forum at a loss for $22/foot.
 
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Because I am busy building another award winning scale flying model and that post was easy to find. Nevertheless, the technical aspects of your post are duly noted with the message of both being of course to make sure that you use the right fuel line.
 

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Hello & Welcome

Sorry to hear of your problems.

I was interested to hear that you have two bikes that suffer from the similar problem. Can I ask, do you get your fuel from Supermarkets? I have had problems with fuel from Tesco and I only use Shell or BP now. This might be a contributory factor to the problem?

Pure coincidence I'm afraid as my fuel stops vary. Pegaso fuel pump failed of is own accord but the dodgy fuel lines was my fault as I used the connecting hose which came in the kit. My advice is; 1. Don't BUY fuel pump 'kits' from eBay. 2. Don't USE fuel pump 'kits' from eBay as they don't fit and are terrible quality.

That aside, I haven't managed to look at the fuel pump hoses yet as been busy changing my car drive shafts. A DIY mechanics work is never done!

I'll pop the dash and give the pins a clean, only reason I mentioned the dash fault was that it caused the bike to 'miss a beat' for a split second when it started to fault.

It seemed very odd and given what had been happening on the journey home, I wondered if they're connected.

So many possibilities at the moment so I think they next thing for me to do is investigate!

That's for all the help, I will keep you posted.
 

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@Rob Caso: I, for one, would love to see a thread on that build!
 

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I realized later that, in the first photo, the model was missing the chin hatch for the flight battery.

This one has it....
 

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That's pretty cool! Some sort of little Fokker, I'd say....
 
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