This weekend I found a problem with my 1972, inline six 115 Merc. I hope this may help others.<br /><br />The choke linkage is connected to the electric solenoid by an approx 1/16" thick braided wire, that has a pressed on link / pin at the bottom end. The pin fits into the linkage in a "crowded" area so there is not room for a cotter key at the tip of the pin. What Mercury did to keep the pin from popping out was to use the tail end of the braided wire (that is approx. 1/4" long beyond the pressed on pin) and capture it with a part of the choke linkage that holds the pin snugly into the linkage. <br /><br />I found that the tip end of the wire was hanging up on the linkage. The end of the linkage that captures the tail end of the wire is flat. This occasionally caused the choke butterfly's to hang up, about half way closed.<br /><br />To fix this problem I took the tip end of the wire and bent it slightly towards the forward end of the motor (closer in towards the choke linkage) so that now the linkage captures it easily without binding. Don't be tempted to clip the tail end wire off, because it would probably pop out of the linkage.<br /><br />I always wondered why sometimes my engine seemed a bit sluggish, and then for no apparent reason it would take off like a scalded dog!!! Now I know. The choke was hanging up, then letting go from normal vibration / operation at high speed.<br /><br />Regards to all,<br /><br />Gold Bear 