Gday all, any thoughts on what this gunk is? Its the bowl off one of the Mikuni carbs on a 1996 GSX250F, the other bowl was similar but not as bad. Bike had been sitting for at least 12 months before i got it. Ive cleaned out quite a few carbies over the years but never seen anything quite like this before . It all dissolved/dislodged from the bowl with carby cleaner but was also blocking all the jets, breathers, etc in both carbs. Needles/slides were glued solid with it and wouldn't move. Cleaned out now and looks OK but I'm still intrigued by what this is the remains of?