carburetor problem 1965 Johnson 18hp

[mike venable]

I recently purchased a 1965 Johnson 18 hp, with what appears to be a fairly new carb and fuel pump. I have gone through and cheched everything I can think of (including cleaning the carb), but I the motor doesnt want to stay running unless it is choked. Mixture has to be closed all the way too. There are a couple of holes on the side and top of the carb the when I cover them, it seems to help a little. I can fix just about anything mechanical, but this ones got me stumped. Thanks in advance!

 

[DJ]

Re: carburetor problem 1965 Johnson 18hp

plumb,<br /><br />How's the float? If it's cork-change it.

 

[steelespike]

Re: carburetor problem 1965 Johnson 18hp

Sure sounds strange to me needing the choke indicates lack of fuel,closing the mix indicates too much fuel??.Are you sure it is the correct carb?<br />With the carb inverted the upper surface of the float(bottom when inverted)should be level and flush with the gasket surface.float drop should be 1 1/2 " measured from gasket surface to top of float.Be sure float has no leaks.<br /> And of course work with a nanual.

 

[mike venable]

Re: carburetor problem 1965 Johnson 18hp

Thank you very much for responding! I decided to go out and give the carb another cleaning. I found one little passage that was clogged. I cleaned it, and now the engine performes great! I do appreciate the advice, and I will change the float(it is cork). I guess it wasnt a bad purchase for a 18hp Johnson AND a 3.5 horse Mariner for $150. Im sure I will be asking questions about the Mariner soon. It has lots of rust and varnish in the tank, and god only knows what else. Thanks again!!!!