Low rpm issues - MVAgusta.net
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post #1 of 9 (permalink) Old 12-01-2017, 03:45 AM Thread Starter
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Low rpm issues

Hi all.

2013 Agusta Brutale 920.

-I have been having this issue where idling was ok (not anymore). Idling at first gets bad that it sounds like it wants to cut out. After its all warmed up the idling gets a bit better (not entirely).

-Pulling away from 1000rpm to 3000rpm the bike receives a jerking motion (not a solid pull away). Sounds almost like its heading towards a twin motor sound, but not entirely.

I have replaced spark plugs.
I have checked the coils.
TPS has been reset and systems updated.
Oil & Filter changed.

I have ran out of options.

If anyone has dealt with similar issues or any advice to what it might be, please. It would be highly appreciated.
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post #2 of 9 (permalink) Old 12-01-2017, 06:36 AM
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How many miles does it have? If this has been a gradual deterioration over time (it used to not have this symptom but has slowly developed) then you need to consider what could cause that. You already eliminated spark plugs...how about valve clearances?

I used to be fast....now I just dream about it.
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post #3 of 9 (permalink) Old 12-01-2017, 08:04 AM
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...or a vacuum leak...?

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post #4 of 9 (permalink) Old 12-01-2017, 11:02 PM
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Quote:
Originally Posted by silentservice703 View Post
...or a vacuum leak...?
+100

Check all the vacuum connections from the fuel pump plate to the throttle bodies
I pulled the brass nipples out of the intake manifold and epoxied the holes closed

No more cracked Chinese vacuum caps for me


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post #5 of 9 (permalink) Old 12-06-2017, 04:35 AM Thread Starter
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Okay so its on 24k at the moment, should go for its Valve Clearance yes. Will check for vacuum leaks as well........but I fear its much worse than what I thought. Bought the bike second hand (have it for 3 months now). When I tip the bike to check the oil level, I could see the oil wasn't running off the glass smoothly.

It was spreading away......so my fear is that I might have water in the engine.
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post #6 of 9 (permalink) Old 12-06-2017, 06:49 AM
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Quote:
Originally Posted by ManiacDray View Post
Okay so its on 24k at the moment, should go for its Valve Clearance yes. Will check for vacuum leaks as well........but I fear its much worse than what I thought. Bought the bike second hand (have it for 3 months now). When I tip the bike to check the oil level, I could see the oil wasn't running off the glass smoothly.

It was spreading away......so my fear is that I might have water in the engine.
The oil will look like a milk shake if there is water in it. Thick and creamy.
At 24K you could have tight valves...that will definitely affect idle.

I used to be fast....now I just dream about it.
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post #7 of 9 (permalink) Old 12-06-2017, 06:50 AM
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If you have water in our engine oil, it will emulsify and turn a brownish "coffee-with-cream" color and have a frothy appearance or some chunky looking detritus on the surface. In short, water-in-oil is very distinguishable.

If the engine hasn't been run for a while, the water will separate out and settle to the bottom of the sump.

If that is even in the conversation, drain your oil and change your filter. Refill with quality oil.

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post #8 of 9 (permalink) Old 12-06-2017, 07:03 AM Thread Starter
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Awesome! Thanks! First I'll jump to the valve clearance and if that doesn't work. I'll flush the engine, replacing the oil and oil filter.

Wish me luck!
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post #9 of 9 (permalink) Old 12-06-2017, 08:43 AM
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As the valves tighten up with mileage, the valve will not seat tightly. This will affect compression. This will affect fuel ignition and the bike will become difficult to start.

A lot of the perceived jerkiness at low rpm is experienced at cold temperatures. These bikes need to warm up.

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'07 F4 312R, '10 B4 1090RR, '15 B3 800RR
'07 Ducati Monster S4Rs, '07 Ducati Monster 695
2010 Harley Davidson Ultra-Classic Electra-glide CVO FLHTCUSEBLK
'63 Honda C100A Cub
'61 MVA TRA 125
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