Re: Merury 115 tranfer port drain restrictors
The design of the transfer port will cause fuel to puddle in this low area when idling as the fuel vapor condenses a little. If these where not there the engine would stumble on acceleration due to the raw fuel thrown in cylinder and fouling plug for a second or two(remember that fuel charge is atomized). The passages are restricted by the restrictor to prevent this as excess is passed to the next lower cylinder. I myself modify these as the restrictors are NLA from Merc. Missing restrictors can cause: (1) a rich condition that people overcome by leaning mixture screw on carb but this can lead to hesitation as it to lean,(2) loading up if having to idle thru a long no wake zone,(3) eratic idling in some cases. Some people say you dont need them but I totally disagree. You can seach for the restrictor mod here on Iboats
