Cleaning gunk left from old float bowl gasket?
Hi all! Post number 2...
Had a gas leak coming from the carb on a 2005 Rebel 250 I picked up a few weeks ago. (There was caked up fuel gunk all over the outside of carb and surrounding areas, so I figured there was a leak when I bought it...runs great overall, though, besides leaking and a bit of a sputter on the idle).
Anyway, I cleaned out the carb and ordered a new float valve and float bowl gasket, which should get here in a few days. The gasket was in really bad shape, so I am hoping that was the root of the problem.
I am wondering what (if anything) to do about a bit of orange/yellowish gunk left from the original gasket. After taking the gasket out, I tried cleaning it off with carb cleaner (pretty passively, mostly just sprayed and let it soak and rubbed with a tooth brush). However, the gunk mostly stayed there.
Any thoughts about how to remove this stuff? I'm not even sure what it is? Rust? Decomposed rubber? Old gas?
1) With old gasket in place
2) Underside of old gasket
3) Without old gasket (a bit hard to see in the picture, but there is a little gunk left in the groove where the gasket fits into)