What is best to cleal carbs on a 1990 140 evinrude?

Question

is it possible to clean without removing???

Answer 1

Depends on how bad they are. If just running rough I would buy a can of Seafoam. Add that to gas tank and run it through. If it is really bad then most likely removal will be necessary. Do not use regular carb cleaner as you will starve your motor for oil.

Answer 2

seafoam makes a product called DEEP CREEP and it is a spray can with a plastic straw on it.Start the boat and rev it up then spray this in the carb intake.Stay on the throttle cause it will want to die on you.then take it out and run it good for about a half hour.Make sure you change your plugs and also get a can of seafoam to put in the gas tank.You might have to do this a couple of times but it will work unless your carbs are totally clogged.Make sure you have fresh gas also.

Answer 3

Anything that you spray into the carb throat does nothing for cleaning the carb where it needs to be cleaned.  Adding stuff to the gas may work some but the bottom line is, if the carb needs cleaning, take it off, disassemble, and clean it properly.  Install a rebuild kit and enjoy how well it runs. The money you spend on the additives and sprays will pay for a rebuilt kit.