5200 Carb Q's- Too Many Ports....

[MercuryMarc]

So I picked up another HW5200 to see if it runs any poorer than my first one. This one has lots more tubes.....

Looks like it has two small vacuuum ports below he water choke and a larger vacuum port at the carb base (looks like a PCV port). I am planning on plugging the base port and one of the ones below the choke and hook up one to the distributor. I already have my PCV hooked into the Clifford adapter.

Near the fuel line inlet tube is another tube that leaves the "ECS" assembly. Not sure to what to do with this extra tube. Plug it maybe?

And the "hot idle cover" is missing - but it looks like there will be no vacuum leaks if I leave it off.

Any and all help appreciated.

(In case anyone is keeping track, I a assembling quite a collection of carbs for my 250, each one running slightly worse than the one it replaced....)

 

[Anonymous]

Got pix?

If the "hot idle cover" is like most carbs' "hot idle compensator" circuits, it opens a passage into the idle air inlet from the air horn when the carb is too hot. This prevents flooding at low engine speeds that is caused by boiling fuel, which ends up dropping down the venturi. It helps to cool down the fuel, reducing the boilover, and temporarily leans out the mixture about 3-5% during the event.