Whats this ????

Joined
Jun 11, 2009
Messages
74
mercruiser alpha 1 3.0

what this brass thing ! lol
 

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Bondo

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Apr 17, 2002
Messages
70,866
Re: Whats this ????

Ayuh,... Looks like the air metering screw...
 

Don S

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Joined
Aug 31, 2004
Messages
62,321
Re: Whats this ????

aka idle mixture screw.
 

Fishermark

Vice Admiral
Joined
Oct 19, 2003
Messages
5,617
Re: Whats this ????

And with only one mixture screw, it makes it a Mercarb. the Rochester version of that carb has two screws.
 

Viking...

Seaman
Joined
May 26, 2009
Messages
69
Re: Whats this ????

let me be a little more specific. what does it do ?

It's the relay for the passenger eject button...you should be very careful when adjusting it.


For a good explanation with pictures, Wikipedia: carburetor.

It's a needle that adjusts the the amount of fuel allowed to mix with the air that is being sucked into the engine while idling.
 
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