Black line on Throttle Body? - 600RR.net
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post #1 of 7 (permalink) Old 02-08-2018, 11:01 PM Thread Starter
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Black line on Throttle Body?

I got this black stuff on the throttle body in each of the four holes. It's only on the flapper that faces the rear.
Seems to be very thin, i couldnt reach my finger in there to touch it and didnt have anything to clean it with either.

Any ideas what it might be or what is causing it?

https://i.imgur.com/TWDpg1Q.jpg
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post #2 of 7 (permalink) Old 02-08-2018, 11:02 PM
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that's supposed to be there. don't try to remove it.
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post #3 of 7 (permalink) Old 02-08-2018, 11:06 PM Thread Starter
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Quote:
Originally Posted by wibbly View Post
that's supposed to be there. don't try to remove it.
that's a relief haha, any idea of its purpose and if it's only supposed to be on one side of the flappers?
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post #4 of 7 (permalink) Old 02-08-2018, 11:20 PM
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it's on both sides, you just don't see the other side because it's on the under side.


it's there to seal the throttles. at idle the plates should be shut, and the idle air goes through the idle control circuit.

they put this paint on the plates, let it dry, then break it, it allows the butterflies to properly seal. if you clean it off your bike won't idle properly.
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post #5 of 7 (permalink) Old 02-08-2018, 11:24 PM Thread Starter
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Quote:
Originally Posted by wibbly View Post
it's on both sides, you just don't see the other side because it's on the under side.


it's there to seal the throttles. at idle the plates should be shut, and the idle air goes through the idle control circuit.

they put this paint on the plates, let it dry, then break it, it allows the butterflies to properly seal. if you clean it off your bike won't idle properly.
Do you know if this applies to other bikes like a 2015 r6?

I was helping a friend change his spark plugs and his throttle body didn't have any markings like mine. His idle once it hits around 100F-120F drops from 1.5k to 1k RPM and bounces between the two.
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post #6 of 7 (permalink) Old 02-08-2018, 11:29 PM
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no idea. i would imagine other manufacturers do something similar in some way anyway.

i doubt your friend's bike was screwed with. probably something else. funny idles are a very common symptom of a lot of different problems.
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post #7 of 7 (permalink) Old 02-11-2018, 10:51 AM
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interesting...

It's strange though how honda use paint in such a botchy way to seal a very important component of engine control system, especially with all the movement and vibration over there.

2009 cbr 600rr
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