Mercury gear ratios

[savage]

What is the gear ratio of a 150 HP Mercury outboard serial #06552262 ?<br />What is the gear ratio of a 200 HP Mariner outboard serial #06494110 <br />Can a 150 HP lower unit be used on a 200 HP powerhead ?

 

[corm]

Re: Mercury gear ratios

Hi Savage,<br />the 150 has a 2-1 set in it.<br />the 200 has a 1.75-1 in it.<br />You need a bigger prop to run it (150) on the<br />200. The dia. of the prop goes down as the pitch goes up so proping it out to get the same peformance may be a problem. Unless your<br />running a 4 blade high rake prop.<br /><br />...have fun...corm

 

[savage]

Re: Mercury gear ratios

Corm my current set up is a 150HP merc running a 24 pitch TURBO prop at 5900 rpm speed is low 60's. My plan is to rebuild a 200HP power head that I have and install it on my 150 center section/lower unit. Both power heads I believe are of the same year. I talked to a local tech and he thinks the 150 and the 200 have the same ratios for that year.I need to know for certain though that's why I gave the serial number information. Can anyone verify the ratios by serial number? THANKS.