Stuart Turner Carburetor.

There really isn't a lot to say about the Stuart Turner carburetor as it such a simple device.


There is only one adjustment you can make and that is by screwing in or out the air adjustment. The manual says there should be about 1/4 inch of thread showing and that's how I've set mine up. To be perfectly honest it doesn't seem to make a blind bit of difference a few turns either way. If your engine is prone to backfiring I recommend you screw it in a couple of turns as that suggest too lean a mixture (too much air).


You also need to ensure the fuel line running from the tank runs in one smooth drop all the way from the tank to just below the carburetor stop tap. If the fuel line dips, rises anywhere along it's run, and drops again you will get an air-lock which will restrict fuel flow to the engine. If the engine starts okay and runs okay at low revs, but splutters to a halt when you advance the throttle that is the likely problem. I ran a straight batten from the stern locker to below the carburettor and fixed the fuel line to that. Much easier then routing it over all those ribs.


Another possible cause of flooding is the float itself. They can get punctured, in which case you need to solder over the hole. BE CAREFUL. Petrol is flammable.


The float is held on the needle by a spring clip. If you've been a bit heavy handed you may have pushed the float down past the groove in the needle that is supposed to locate it. If you can slide the float up or down the needle without pressing in on the springs it is not located correctly.


Something that can catch you out is trying to motor sail. Sorry, you cannot do that as when the boat heels the float jams and the carburetor either floods with fuel or starves.