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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
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  #1  
Old 12 Sep 2009
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Black residue in inlet port

As the title suggests. Fairly thin and solid, wont come off in any quantity with a cloth but a bit of carb cleaner and a wipe and its gone. Its only in the secondary inlet port. Iv given it a clean and Il check again fairly soon but in the mean time any suggestions what the residue could be or the cause?
Thanks guys!
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  #2  
Old 13 Sep 2009
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I also had this on my TTR600
I think it may be normal,bike runs ok
Will post a pic if I can find it
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  #3  
Old 13 Sep 2009
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If its only the secondary, must be when its on small throttle opening & the secondary is still shut, therefore has low pressure in the port, so any blow back (at valve overlap) entres & leaves a deposit?
Interesting............ never thought much about this one!
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  #4  
Old 14 Sep 2009
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Thats an interesting idea. The set of carbs I got, not from this engine, also had residue on the secondary butterfly. Problem is my Srx400 engine has clean inlet ports
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  #5  
Old 14 Sep 2009
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Could it possibly be oil from the engine breather? No idea of teh plumbing on your bike.
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