Id guess 1.87:1, but have seen exceptions. If you want dead-on accuracy, then you can measure this. Take the cowl off the motor, and the flywheel cover (plastic with 3 plastic wing-nuts typically). Take a pencil or some type of pointer and tape it securely to the prop hub, going directly across the prop nut. Take a screwdrive or whatever and slowly turn the flywheel so that the pencil point is aligned directly with the trim tab bolt midpoint (not the tab itself, since it might be turned to the right or you might only have a zinc plate there). Mark the flywheel tooth that is in line with something you can remember, and then start turning it until you have turned it one revolution exactly. Now you need a protractor which you align vertically thru the center of the prop and measure the angle of the pencil (note that the pencil will not quite be pointing straight down, but it will have moved past 180 degrees. So you measure this angle from the skeg toward the pointer, and add this to 180 since it went past the 180 degree point when it passed the skeg. Divide this angle into 360 to get the gear ratio. For example, if it has moved exactly 180 degrees (pencil pointing straight down, angle from pencil to skeg is zer o degrees), you would have a 2.0:1 gearcase ratio, which is not uncommon for smaller motors, but not 200s.2008 Pantera Classic2014 Mercury Pro XS 200