Get a couple cans and read the directions. For sure. <br /><br />1. In general, you can mix up a super dose (two cans) of the stuff in a portable tank with about three gallons of gas. or premix if your engine is not oil injected.<br /><br />2. Run that mix through the engine, let it sit overnight. <br /><br />3. Run with regular gas, preferrably on the water where you can give the engine a thorough workout.<br /><br />Decarbonizing is rough on spark plugs. You may have to change them.<br /><br />Read the FAQ on Decarbing here.<br /><br /> http://www.iboats.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=36;t=000006
I just did a decarb this weekend. Did it by way of spraying directly into carbs on a Johnson 90hp V4. I found it improved idle and midrange smoothness. Seemed to smooth out overall but maybe that's what I expected so that's what I saw as a result. (The power of suggestion is pretty strong.) Good luck and watch out for the smoke, it really smokes.<br /><br />Dave<br /><br />P.S. You're not Scott Parker from MA are ya?
I decarbed my 200 Evinrude, and it did get a lot quieter especially around 3000 or so where it makes it loudest resonance. Also seems to start much much quicker now as well, first turn of the key and only a few spins.
