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Old 10-15-2013, 09:15 AM   #16
MortimerSickle
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This will probably only add to the mystery, but I bought a low mileage 990 that had weird deposits in the intake tracts.

I never did see the throttle bodies of the bike it came out of, but the intakes looked like this:



I brushed it out as well as I could, then ran it several thousand miles with carburetors. When I pulled it apart for my first valve adjustment, the intakes were clean as could be.

I have seen similar pics posted, and often the condition is blamed on ethanol fuel. But, almost all of the fuel I use is E10. so I doubt that theory.
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Old 10-15-2013, 09:49 AM   #17
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that would be my guess (fuel+ethanol) based also on previous issues seen around OC, but i'm not affected to that kind of fuel cocktail so can't add much.

This one clearly (or darkerly) seem to be oil/soot deposits from missed combustion...

Wether is a ongoing problem, or remnants of something fixed before, it's unknown..
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Old 10-15-2013, 10:30 AM   #18
MortimerSickle
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I guess I didn't make clear that the deposits in my intakes went away while using ethanol fuel.
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Old 10-15-2013, 10:33 AM   #19
pdxmotorhead
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I've seen that same stuff many times on alcohol powered dirt cars injection and intake and anything aluminum that gets near methanol, and it is then left to sit.
A good alky fuel stabilizer will help. Most Sprint car owners "pickle" their Hillborn style injection with Wd40/Marvel Mystery Oil/inser fav oil here... after races, the Methanol attracts water and will badly pit aluminum in a very very short period of time, like a week!

Remember E10 is a min value, I've measured E10 at 18% several times..

Easy way to a dq at the track is un checked pump gas.. IN fuel limited race classes..

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Old 10-17-2013, 04:19 AM   #20
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New developments, after a longer and carefull ride finally noticed something not right.

Engine idles fine, but with very small throttle openings when starting to move it will occasionally backfire into the intake. Once it stalled the engine though.

Interesting how different riding styles can mask symptoms.

Either air leak through intake boot of something wrong with the injector..
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Old 10-17-2013, 04:57 AM   #21
Boatman
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Tight intake valves
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Old 10-17-2013, 08:23 AM   #22
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Quote:
Originally Posted by Boatman View Post
Tight intake valves
will check it too.

start to think that work more on friends bikes than my own......
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Old 02-19-2014, 02:12 PM   #23
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digging a bit of a thread.

No tight valves, checked them and only one in front cylinder was a bit tight but still within range.

While riding occasionally it feels a bit of a fart into the airbox, especially at low revs. Spark plugs are ok with good color. Thinking about injector operation... related to random incorrect spray time, a fraction of a second off the valve opening time, perhaps...
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Old 02-19-2014, 11:08 PM   #24
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Interesting, I have a 2011 990 with the exact same symptoms. Bike runs perfectly under power, on decel, overrun, etc. But every once in a while, if stopped at a light with the clutch pulled in, when rolling on the gas the bike will pop/fart and then stall. It'll start right back up and run like mad, but the occasional stalling thing has me stumped.

I've :
Sync'd the Throttle bodies
Set the TPS
Checked the Map (Powertripp)

I will be:
Checking the valves this next service (but they were fine at the last check)
Replacing the plugs

I'm running a foam filter now, but the issue occurred prior to the new filter. I've just started rolling on the gas harder/earlier from a stop. It's a band-aid, but I haven't a clue what else to check.
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Old 02-20-2014, 03:40 AM   #25
Bowber
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Quote:
Originally Posted by MortimerSickle View Post
This will probably only add to the mystery, but I bought a low mileage 990 that had weird deposits in the intake tracts.

I never did see the throttle bodies of the bike it came out of, but the intakes looked like this:



I brushed it out as well as I could, then ran it several thousand miles with carburetors. When I pulled it apart for my first valve adjustment, the intakes were clean as could be.

I have seen similar pics posted, and often the condition is blamed on ethanol fuel. But, almost all of the fuel I use is E10. so I doubt that theory.
Never seen that before and I raced speedway and grasstrack bikes for 30 years running pure methanol. On carbs though.
The carbs would get gunked up if left (but took a while, like a month or more) and some parts would corrode badly but nothing in the inlet.

Steve
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