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Old 01-14-2014, 08:47 PM   #16
jwalters
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My 2008 990S has dirty throttle bodies as well. I keep the valves in spec but they still acquire some varnish (50,000+ miles on the odometer). I think it's normal for these bikes. Possibly due to crank case venting some oil into the airbox?? Not sure, but that would be my guess. Regardless, I wouldn't worry about, check the valves and go from there.


Quote:
Originally Posted by Newbusa View Post
My 2010R has oil residue on rear throttle body as well and valves in spec.Does not seem to burn oil between changes,I just cleaned it up and re-installed. If it ain't broke don't fix it
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Old 01-14-2014, 10:54 PM   #17
Newbusa
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Quote:
Originally Posted by Sumi View Post
You can get an idea about it in this thread:

http://www.advrider.com/forums/showthread.php?t=841503

But IMO first check for vac leaks going on anywere near that throttle body (ports on the intake, rubber boots, TB proper seating), then I'd check the valve clearances (you are into that anyways, aren't you?) And if everything seems to be fine check the TB sync.

If I recall correctly the rear flow sensor*? (is that what it's called?) is also hooked up to that intake (at the vac port), so it can measure intake air flow or whatever - so any leak in this system could also lead to misfiring/backfiring into the TB. So check the connecting hose for any cracks. Don't know how to check though whether the sensor is working correctly - maybe swap it with the front sensor, and see if the problem shifts to the front cylinder?

*Edit: Looked it up in the fische: 61041085100 PRESSURE SENSOR.

I belive the guys who adjust the TB with TuneECU, rely on the values of these sensors, so if you also have a plugin type flow meter / other syncing tool, you can quite rule out if the problem lays somewhere in here. Also to get the job done properly, if you are really willing to dig into the deep, finding out what's going on, adjusting the sync and the TPS, you'd probably need TuneECU (and lots of free time:)). That said, it can be anything different, like the TB not providing enough fuel/shutting off all the fuel on closed throttle because of a failing TPS, or misinformation from one of the sensors (o2, pressure).. I believe it's quite hard to diagnose, so if the simple things don't solve the problem, maybe living with it is easier and cheaper than fixing it trial-by-error.
Quote:
Originally Posted by jwalters View Post
My 2008 990S has dirty throttle bodies as well. I keep the valves in spec but they still acquire some varnish (50,000+ miles on the odometer). I think it's normal for these bikes. Possibly due to crank case venting some oil into the airbox?? Not sure, but that would be my guess. Regardless, I wouldn't worry about, check the valves and go from there.
It will be interesting the next time I have the filter off, I recently installed the Rottweiler intake and filter and re routed the crankcase vent hose outside the intake with its own little K&N filter. It should mean my throttle bodies will no longer have oil varnish on them. Maybe? :-)
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Old 01-14-2014, 11:37 PM   #18
injun
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Oil

Comes from acceleration .
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Old 01-15-2014, 03:03 AM   #19
Gustavo.Ramos
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The OP says the dirty residues are on the rear TB, the front one is clean, so it seems logical that the bretahing pipe from crankcase cannot be the cause of it as it points directly into the front TB...

Same boat here, a friends 990 is in the same condition, valves are in spec.

If it has residue, it must be a mix of things (fuel + carbon/oil...). Through the TB's things go only one way, fuel and air travel into the intake and combustion chamber.

These two do not produce residue, unless ver bad fuel and/or damaged airfilter, gasoline is used also to clean so its ruled out.

Only way to have it gunky is if anything comes up from the engine valves, and there can be exhaust fumes, unburnt gas, oil traces and carbon buildup.

For this to come up, either tight valves, bad firing/missfiring.. random injector malfunction can have it injecting at wrong times, or weak fuelflow that will have air/fuel mix not be burned due to lean condition...

I'm puzzled..
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Old 01-15-2014, 09:05 PM   #20
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My valves aren't as bad as I figured they would be but I will be buying shims .

TB residue .... I'm Kinda curious if it is from the crank case vent .
ONLY because I for one have had issues with high oil level .
So far every oil I have used has expanded on me to an over full condition when hot . Even with Motul .
I will try to use Motorex this season since I now am able to buy it . New dealer near me . I would like to find an oil I could pick up on the road tho .

With the numbers that mention it here I'm not real concerned I'll just clean them (TB) during major service .
It is strange to me that only my rear TB is dirty
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two trackin fool screwed with this post 01-15-2014 at 09:11 PM
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Old 01-16-2014, 09:42 AM   #21
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More oil than max can do this

If he's used more oil than he should it is possible to get even a splatter of oil (that could reach the rear TB) from the crankcase breather. I suppose you saw it on the secondaries?
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Old 01-17-2014, 12:37 AM   #22
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Well I cant speak for anyone other than me but this is what I found on tear down ....


Not real concerned at this point . I'll just clean her up and see what I find at next check . Rear TB coated top to bottom both plates .
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Old 01-17-2014, 01:05 AM   #23
two trackin fool
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Quote:
Originally Posted by Newbusa View Post
It will be interesting the next time I have the filter off, I recently installed the Rottweiler intake and filter and re routed the crankcase vent hose outside the intake with its own little K&N filter. It should mean my throttle bodies will no longer have oil varnish on them. Maybe? :-)
It will definitely take the breather out of the issue !
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