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Decarb method? 1992 Evinrude 90hp
Lucas M	#1  Posted on 10/08/18 - 11:01 AM
Member Posts: 23 Comments: 0 Joined: 09/14/17	Hi, question about where to spray the OMC/Johnson engine tuner for decarb, when I remove the engine cowling of my 1992 Evinrude 90hp, I notice I have three air intakes in the silencer by the carburetors. The can indicates to spray into the throat of the carbs when running engine at 1200rpm, do I just spray the can into each of the three intakes continuously until none is left (trying to keep motor from stalling)? Or do I actually need to remove the silencer housing and get at the carbs? Seems to be a lot of connections and gaskets, am hoping it is as easy as spraying into the intakes and then waiting the 12 to 16hrs. thanks Edited by Lucas M on 10/08/18 - 1:01 PM
Weatherly	#2  Posted on 10/09/18 - 4:28 AM
Member Posts: 752 Comments: 4 Joined: 12/31/06	You are correct, you need to remove the air silencer cover in order to spray the engine tuner fluid directly into the two carburetor intakes. Remove the 7 screws that hold the cover in place. Otherwise, follow the instructions on the can.
Vances Revenge	#3  Posted on 10/09/18 - 8:47 AM
Member Posts: 91 Comments: 2 Joined: 03/15/14	I have a 1992 Johnson GT200 on my river boat. After you decarb your motor. I found running Sea Foam in my fuel made an unbelievable difference in the way my motor starts and runs. In fact, my motor went from hard starting in the mornings, to running like new. Because of my Whaler project this boat now sits for long periods of time; I have run it in every tank for the last couple of years. It sat from October last year to August of this year and started like it hadn't sat at all. I couldn't believe it! I have never seen additives this effective. You might give it a try. Vance Edited by Vances Revenge on 10/09/18 - 9:06 AM
Lucas M	#4  Posted on 10/09/18 - 12:52 PM
Member Posts: 23 Comments: 0 Joined: 09/14/17	Great, thanks for the advice, I took a closer look and it appears to be pretty easy to remove the cover and I have ordered a new gasket to ensure no leaking from older one. Will look into the Sea Foam for next year as well, trying to keep motor in as good shape as possible given the age.