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Old 03-11-2014, 05:57 PM   #1
GrenDesb OP
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Dirty intake ports

In the process of doing my valve check, I discovered some sh*t in my intake ports, on my intake valves and under the TB butterflies.

Looks worst in person than on the pictures. Looks like the shit forom the intake ports wall is flaking of and sticking to the valves.

Ethanol residue???

Front cyl:





Rear cyl:





So what to do with this? Clean? How? Leave it as is? Use fancy stuff in my fuel????
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Old 03-11-2014, 06:35 PM   #2
TDsurf
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Dirty Nasty

WoW! that's way nasty. How does your air filter look?
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Old 03-11-2014, 06:44 PM   #3
GrenDesb OP
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Air filter is clean, secondary throttle butterfly is clean too. That's why I beleive it comes from the gas itself.

Not too concerned about the cause for now as I'm pretty sure this has been caused before I bought the bike.

Question is what to do as far as cleaning this?
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Old 03-11-2014, 06:50 PM   #4
Chuckracer
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How does it run? If it runs ok I wouldn't sweat it, myself.
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Old 03-11-2014, 06:50 PM   #5
BigTony
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I found stuff just like that but worse when I did my first valve check. No idea what it was but it hasn't re-occurred in 15k miles since
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Old 03-11-2014, 06:54 PM   #6
BigTony
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Oh, I cleaned it with a brush and throttle body cleaner but almost had a loose bristle fall into the cylinder.. Yikes be careful
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Old 03-11-2014, 07:05 PM   #7
scudrunner82
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I think if you try and clean it you might do more damage than anything. I've seen worse, in cars and otherwise. IMHO run it and be happy.
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Old 03-11-2014, 07:44 PM   #8
Tom_C
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Ethanol gunk for sure. Not going to recommend a fuel treatment in this thread, but you might want to start thinking about adding something to the tank. Disclaimer: If you are going through a tank a day, I may be wrong, but if you have gas that sits a while, it might be worth looking into.
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Old 03-11-2014, 07:53 PM   #9
DELTATANGO
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corn doo doo
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Old 03-11-2014, 09:01 PM   #10
MortimerSickle
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Quote:
Originally Posted by GrenDesb View Post
...
Ethanol residue???
...
That is a popular assumption, and a seemingly likely culprit.

I would like it to be true, because I don't like having ethanol in my gas, and this would give me more evidence that it is bad.

But...

I bought a 990 engine to put in my 950 bike, and this is what the intake ports looked like when I got it:



I brushed them out as well as I could, and installed the engine.

About 9500 miles later, when doing a valve clearance check, I found the ports were clean.

Almost all of that mileage was on 10 % ethanol gas.
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Old 03-12-2014, 12:04 AM   #11
TDsurf
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Clarify

I think the only way you are going to know for sure is to take a scraping and have a lab run the sample.
Is there an inmate out there that has access to a lab, please step forward?
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Old 03-13-2014, 09:26 PM   #12
GrenDesb OP
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Thank you guys for your inputs.

I'll clean what I easily can and ride.
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