Join Date: Nov 2000
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Re: MC2100 - Identify the power valve on this diagram
If you are running a manual choke, plug the opening inside the choke housing that is connected thru the casting to manifold vacuum. It draws additional air into the manifold, unfiltered in your case. Remove the plastic manual choke cover and with the motor idling you will find the approx 3/8 inch diameter barrel shaped opening. It can be sealed off with epoxy or silicone. The original electric choke had no openings to the exterior,(other than the casting's threaded fitting that goes to the exhaust passage) and this port draws heated air through the choke to warm up the choke coil. Mights as well plug it. Or you can removed the choke housing and plug the small hole in the casting revealed. There should be a small oval gasket there where it attached to the carb body via a screw thru the choke housing.