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Old 10-14-2013, 04:18 PM   #1
Gustavo.Ramos OP
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Eek Strange looking intake

Got intrigued today when looking down at a mates KTM 990 (2006), the rear cylinder intake looked quite ugly, greasy/sooted.. plugs look fine, no complaints about driveability. He was dazzled, but i believe he never seen the throat of his bike, so anything would dazzle him...



Anyone ever seen this before and figured what could be the cause of it?
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Old 10-14-2013, 05:02 PM   #2
DELTATANGO
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Valve too tight?
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Old 10-14-2013, 09:24 PM   #3
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Is the crankcase breather on the rear of the air filter?
If it is, I can see where most of the crap would get sucked in the rear inlet.
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Old 10-15-2013, 12:43 AM   #4
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Quote:
Originally Posted by DELTATANGO View Post
Valve too tight?
Doesnt sound like, but worth checking

Quote:
Originally Posted by mjskier View Post
Is the crankcase breather on the rear of the air filter?
If it is, I can see where most of the crap would get sucked in the rear inlet.
No, stock setup, breather into the front & clean throat!

Been searching about it and the closest i've found relates to bad injector, although the engine revs fine.
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Old 10-15-2013, 12:53 AM   #5
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Backfiring into the TB can lead to this. Actually this is the only thing I can imagine that gets carbon buildup inside there:) Didn't your mate notice backfiring into the airbox / cutouts / farts? :)

Anyway.. check the seating of that TB (look for a torn boot) and if the vac. ports on the intakes are OK. (no torn vac. hoses for example)
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Old 10-15-2013, 01:15 AM   #6
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Backfiring into the TB can lead to this. Actually this is the only thing I can imagine that gets carbon buildup inside there:) Didn't your mate notice backfiring into the airbox / cutouts / farts? :)

Anyway.. check the seating of that TB (look for a torn boot) and if the vac. ports on the intakes are OK. (no torn vac. hoses for example)
Did i mention the guy is dazzled with the bike? Brand new to him...

Took it for a spin and it doesn't feel like missfire, maybe with closed throttle engine braking there is some exhaust backfiring but can't really assure if there is into the TB's.

Been once on the 950 with an intake torn boot and felt it, but not this time. Taking the TB's out.
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Old 10-15-2013, 02:08 AM   #7
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Well then maybe it's an old story for the bike which has been sorted out already and noone cleaned the TB since.. Poping on decel at the exhaust is normal ofcourse, and if you can't feel anything wrong while riding it / idling (a carb/tb backfire is quite noticeable), then I doubt you'll find anything out of ordinary if you pull the TBs.. But at least you can give it a good clean. Don't fix it if it ain't broken :PPPPP
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Old 10-15-2013, 04:14 AM   #8
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the cause i dont know precicely but have seen it on more than a few bikes already. I recommend using some fuell additive once in a wile to keep things clean. Dont worry about it for the rest, as long as the valves are in spec.
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Old 10-15-2013, 04:36 AM   #9
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I have seen that before. As the SAS enters at the rear of the airbox I wondered if that could be causing it?
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Old 10-15-2013, 04:44 AM   #10
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A friend bought a 950 a while back and had the same thing. Bike ran great with no issues but it bugged him. Valve check showed the intakes on that cylinder were tight. Since he corrected the valve clearances the intake is staying clean. Also noticed the bike was a bit smoother.
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Old 10-15-2013, 05:08 AM   #11
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Check the valve clearances just to be sure.

Also it could be that someone put too much oil into the engine. In that case the crack case breather spits out some of the the excess oil over the front cylinder intake. Front trumper intake sould be very oily.
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Old 10-15-2013, 06:02 AM   #12
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Quote:
Originally Posted by Peanuts View Post
I have seen that before. As the SAS enters at the rear of the airbox I wondered if that could be causing it?
No SAS.

Quote:
Originally Posted by keener View Post
Check the valve clearances just to be sure.

Also it could be that someone put too much oil into the engine. In that case the crack case breather spits out some of the the excess oil over the front cylinder intake. Front trumper intake sould be very oily.
Front intake clean as shown in picture

Quote:
Originally Posted by Sumi View Post
Don't fix it if it ain't broken :PPPPP


taking the TB's out for clean, verify intake boots and check valve clearences. I'm pilling beer cases for these services
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Old 10-15-2013, 06:24 AM   #13
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What about the reed valve on the smog thingy?
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Old 10-15-2013, 06:51 AM   #14
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Quote:
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What about the reed valve on the smog thingy?
Not sure if you're talking about the vapor canister, it's a EU model so no such device.
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Old 10-15-2013, 07:09 AM   #15
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I'm kinda liking the too much oil thing right now. Easy to do if you fill it up cold.
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