Re: OMC 2.5l 4cylinder Rochester 2G Carburetor Issues
The fuel comes from the center of the boosters ( the round piece that hangs in the center of the barrel ). Engine vaccum pulls the fuel out.
Is your choke blade closed before you crank it? Are your idle mixture screws out about 2 turns each? If not, adjust choke til its about 1/2 closed to begin with ( final adjustment will come later ). Disconnect the throttle linkage so you can work it by hand. Pump it twice, then have someone to spin the starter. Once the engine fires, work the throttle just enough to keep it running and adjust the idle speed screw in until it keeps it running. Once it gets a little heat in it, back the idle screw down til it almost quits, then slowly turn one of the idle mixture screws in and listen if it helps or hurts idle. Once the sweet spot is found with that screw, move to the other one and repeat. After that the engine should be idling faster, so back the rpm back down and go over the mixture screws again. If done right, by the end of the 3rd set of adjustments your idle mixture should be good. Now turn the idle speed screw in until the engine is at about 700rpm or so. Now shut it off and it should refire fine ( choke blade should be open fully now due to warm engine )