1974 evinrude 18hp fastwin wont idle worth a $#!*

[merc16]

hey guys,<br /><br />i have a 1974 18hp evinrude fastwin and it wont idle everytime i start the engine it revs up a bit then sounds like there is a big sputter of air that comes out of the engine does anybody know what this could be?????? and i would also like to know is that there is a hose that runs from the front of the engine block to the top piston intake side(starboard) what the heck is that hose there for and whatever it is there seems to be some kind of gum building up around the outside of it help will be greatly appreciatd

 

[moderator1]

Re: 1974 evinrude 18hp fastwin wont idle worth a $#!*

Merc16,<br /><br />Please avoid double posting.<br /><br />hey guys,<br /><br />i have a 1974 18hp evinrude fastwin and it wont idle everytime i start the engine it revs up a bit then sounds like there is a big sputter of air that comes out of the engine does anybody know what this could be?????? and i would also like to know is that there is a hose that runs from the front of the engine block to the top piston intake side(starboard) what the heck is that hose there for and whatever it is there seems to be some kind of gum building up around the outside of it help will be greatly appreciatd<br /><br />Space on this board is precious. If you want to move it up, simply reply to yourself. Your second post has been deleted.<br /><br />Thanx.

 

[Paul Moir]

Re: 1974 evinrude 18hp fastwin wont idle worth a $#!*

I expect the hose your talking about is the hose that powers the fuel pump. It operates on the vaccum/compression pulse of one crankcase chamber. If your seeing gook coming out you might be making that chamber is leaking causing a lean misfire (sneeze). Does this sound like your problem?

 

[merc16]

Re: 1974 evinrude 18hp fastwin wont idle worth a $#!*

yes this is the exact problem how do i fix it?<br />my engine is sneezing!

 

[Paul Moir]

Re: 1974 evinrude 18hp fastwin wont idle worth a $#!*

Sneezing indicates your going lean, which is to say you don't have enough fuel for the air for some reason. <br /><br />If your crankcase leaks, fuel/air will get blown out the hole and just air will get sucked in.<br />Look for holes and fix em. (Like your leaky hose - replace it)<br /><br />If your carburator is clogged with crud, it won't provide enough fuel.<br />Fix this by cleaning the carburator in carburator cleaner, blow it out with compressed air & rebuilding it with a rebuild kit.<br /><br />If your fuel pump is crummy, it won't supply enough fuel to the carb.<br />Test this by pumping the primer bulb and seeing if it goes away. Fix it with a fuel pump kit.<br /><br />A manual for your engine will take you through all these tasks step by step.