Drying it off with a towel will stop most of it. You don't need as strong a H3PO4 solution as ospho. Go to Home Depot and and get a product called "Must For Rust". It is a mild phosphoric acid solution that should be mostly used as a rust protectant. Comes in a squirt bottle, spray it on and wipe the excess off. A similar product (internet only) is Picklex 20, costs much more and I consider it no better than Must For Rust. On your manifold it won't make much difference, but I don't like using acid on cast--it can get in the pores and cause lifting of the paint later. However, I have done it without problems, but I don't use it on cast any more. The main way to prevent rust is to get the thing dry and keep it that way.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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