recirculation system fuel

[flattop1]

Would some one please explain this system.
What are the benefits?
Why can't I just plug it off and eliminate it?
My 1978 140 has none of this and works fine..
puddling fuel in the reed assembly was what I thought just do not see how fuel is building up there .

 

[jimmbo]

Some gas and most oil falls out of suspension in the crankcase. It puddles and eventually loads the engine up. Old(pre 1970) engines used to purge this buildup thru check valves into the exhaust. Concerns about unburnt fuel being discharged into the water brought about the recirculation systems. Instead of dumping this fuel-oil mix, its pushes it to lube the upper and center crankshaft bearings, and to the transfer passages to be burned. Your 140 has it unless some clown removed it

 

[flattop1]

maybe I named it wrong. the system on the reed block in front of the reeds with the 4 check valves..
so its internal in the reed block on the older models?
and the 1985 uses the check valves with the rubber tubing.

 

[flattop1]

Okay so the crankcase pressure forces oil through the check valves to oil the main bearings..
this model has no feed too the bypass covers.
The thing I can not understand is how this could possibly effect the Idle as described in the manual?
I have 3 check valves that are open and one that seems plugged or at least appears to have a rubber diaphragm in it.