2.0 1986 Black Max Final drive ratio?

[capt911]

I am out of town working and trying to figure out what my lower unit drive ratio is. I have a standard 1986 135 Black Max 20".

I have my serial number will that help me at all I know it tells me the year 0A980754. Trying figure out if it is 1.87 or 2.00 to 1?

Any help would be greatly appreciated

Thanks

 

[jumbofordman]

I don't think the serial number helps at all, every time I use mine to look up something, it just return that it's a v6 mercury between 135-200 HP.

You might want to try just doing it the manual method. Put the engine in forward, and spin the engine over with a socket on the flywheel bolt. Mark the prop so you can measure exactly one revolution. Now, see if it takes exactly 2 revolutions of the engine to rotate the prop one full revolution (if so, then it's a 2.0 gearcase.) If it takes just a little less, then it's a 1.87.

 

[capt911]

I don't think the serial number helps at all, every time I use mine to look up something, it just return that it's a v6 mercury between 135-200 HP.

You might want to try just doing it the manual method. Put the engine in forward, and spin the engine over with a socket on the flywheel bolt. Mark the prop so you can measure exactly one revolution. Now, see if it takes exactly 2 revolutions of the engine to rotate the prop one full revolution (if so, then it's a 2.0 gearcase.) If it takes just a little less, then it's a 1.87.

Sounds good I will pull my spark plugs when I get home and do that

Thanks