Kawi2strokes.com Forum

I used an mild acid-"pickle" which is used for cleaning copper and silver in metalsmithing. Looks the same as yours after. Your float bowls clearly aren't affected other than being clean, I would do the rest just like you did that float bowl. I left a cap in for a longer time and got some etching on it.

I have you phosphoric acid, lemon juice, simple green etc., heated, cold, with and without the ultrasonic. The best result was from the acid, warm. Many thing tend to turn them somewhat blackish-the zinc in the pot metal reacts to a lot of things.

Try a soft brass brush after the dip and rinse. It really makes them look like new without looking "polished". I use wd40 after which keeps them from oxidizing, which is due to the zinc in the pot metal.

I have pictures at home I'll post later.

John

Muriatic is pretty nasty stuff! I'd be afraid it could eat the threads holding the pilot jets etc too fast.

What you actually want is phosphoric acid. Home Depot carries this as Behr "concrete floor etch" (be sure you purchase the one labeled phosphoric acid). Timing is the key to get the colour you want. If you leave your carb parts in too long they tend to go dark.

J