High Speed Orifice Question

[alleymize]

I have a 1970 40 HP Johnson and have a question on the high speed orifice. I do not have a high speed needle on the bottom of the carb. It is just a, what I am reading, a drain plug with the high speed orifice behind it. I can take it out and it appears to be clean. But my questions are:

1. If this is a drain plug shouldn't the fuel drain out of the bowl when I remove both the orifice and drain plug off? I am thinking that this is how I am to drain the fuel out of the bowl at the end of the year. Is there some trick for getting it out because mine does not drain anything out but a couple of dribbles.

2. When putting the high speed orifice back in do I just screw it all the way down until it stops or do I back it back out a certain amount after seating it?

Thanks for any help.

 

[tashasdaddy]

Re: High Speed Orifice Question

no need to remove jet to drain, just the screw. tilt engine. and put screw back in. the jet itself, screw all the way in.

 

[alleymize]

Re: High Speed Orifice Question

But when I pull the drain plug nothing comes out. I have not tried tilting the engine up but I would have thought it would have at least something come out when I removed it. Does anything come out when you remove the drain plug before tilting? I will try this tilt thing and let you know.

 

[tashasdaddy]

Re: High Speed Orifice Question

carb could already be empty.

 

[alleymize]

Re: High Speed Orifice Question

The reason for the above question is I am not getting any gas coming out into the carb for it to start. I did do a rebuild of the carb and cleaned everything with carb cleaner. The low speed needle area appears clean including the 3 small holes in the top of the throat of the carb where the gas should be coming out. I can take off the bowl and there is gas in it so I do not understand why I am not getting any into the throat of the carb.

 

[alleymize]

Re: High Speed Orifice Question

As to the answer to "it may already be empty"... I actually removed the drain plug and orifice and saw nothing was coming out and thought the same thing. I then removed the bowl and it was filled with gas. This is the reason I asked the question should the orifice go all the way in or be turned back out after seating.

 

[Al-53]

Re: High Speed Orifice Question

you just screw the high speed in and seat it and that's it..no backing it out ...it is not adjustable...

Al