1. The Carburettor Body

This is the carburettor for my Mercury 2.5hp 2t (two stroke).

They are mechanically simple, as are 2t engines in general. It has one jet and one needle valve, a simple air restrictor to make a simple choke mechanism and a very simple collar connection to the manifold of the engine.

I haven't had much to do with boat engines, having dealt mainly with bike engines because I seldom have enough money to pay for repairs and servicing. This first photo is a picture of the right hand side of the motor above the carb, with the top panel off of course.

The air in-take is a small hole above and our side of the front of the carb's round mouth. There does not seem to be a filter there nor the mounting brackets for a filter, although I don't know so couldn't say definitively.
On this side can also be seen a screw that I assume to be the method for setting the idle speed, although that'll be looked at and talked about in more detail later.


This is the left hand side view, where you see the fuel pipe connecting to the carb.
The arm visible on the left of the picture, just below the cast 'Open' text, is the choke lever. This moves a paddle in the mouth of the carb that restricts the air in-take, so creating a rich mixture for starting in poor conditions.