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Old 12-01-2014, 08:43 PM   #1
CRW OP
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Grey residue build up in intakes

So I started the process of installing my CPR intake. (2006 950 ADV)
Got everything off, and while looking around noticed a grey build up in the intake ports. kind of a light grey that crumbles or wipes off to the touch.
Had the heads off last winter and it was not present then.
Have not been able to get a good photo to represent it. Look at the pics its the darker grey in the pics.
Bike runs like it should.
I do live in California where we get the ethanol crap gas....
Could it be oil passing thru the carbs vaporizing the building up on intake wall?
Thoughts ?? comments...
Was thinking i could scrape/vacuum it out making sure the intake valves are closed.
Or should i just let it be?

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Old 12-01-2014, 08:45 PM   #2
Qwik
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It's our shite fuel. Mine has the same thing. And good luck getting it off without a CHISEL
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Old 12-03-2014, 10:47 PM   #3
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That looks pretty normal to me. Actually, I just wish my valve stems/guides were that clean and shiny. Hope you got those X rings today, or get them tomorrow, I put them in the mail monday.

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Old 12-04-2014, 02:19 AM   #4
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No problems.
Reassemble and ride. Its fuel specific and causes no damage to the eng
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Old 12-05-2014, 08:13 AM   #5
gearheadE30
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Yep, it's from a combination of fuel and oil from the crank vent system. Those carbon deposits are normal, and fuel passing through the intake generally will keep them to a minimum as long as you don't ride like a grandpa all the time. Perfectly normal, and yours really looks pretty good.

A little aside - one of the problems with direct injected vehicles has been that without the fuel mist in the intake, cars will often get a lot of carbon buildup due to oil blow-by, particularly in turbo applications with more PM in the intake, as well as more heat in the air and runners.
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Old 12-05-2014, 11:08 AM   #6
MortimerSickle
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Though it doesn't really make sense to me, I wonder whether this could be injection related, rather than fuel related?

I didn't notice any deposits in my 950 engine, but when I got a used 990 replacement engine, the intakes looked like this:



I scrubbed them out as well as I could, but couldn't get it all.

After 10,000 miles running on carburetors, and 10% ethanol gas, the intakes were almost completely clean.

But again, I really don't know what injectors would do differently that would cause such a condition.
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Old 12-05-2014, 02:05 PM   #7
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Mortimer, did you find this more on the front cylinders by chance?
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Old 12-05-2014, 02:33 PM   #8
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Quote:
Originally Posted by Chuckracer View Post
Mortimer, did you find this more on the front cylinders by chance?
I did the swap in 2009, so I can't recall from memory how the ports compared when looking right at them. But, these pics seem to show that the front may have had more.







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Old 12-06-2014, 10:53 AM   #9
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Thanks for all your replys. Kinda figured it was the shite gas.

The build up seem to be even In both intakes.
What seems strange to me is it that this build up has never been present before on my bike. I have had the carbs off pleanty of times. I had the heads off less than 5k ago(bad head gasket) And the machine shop touched up the heads and soda blasted everything.
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