I have 4.3 merc with Alpha 1 Gen 2 outdrive. Recently completely replace upper and lower unit with new upper and lower unit. I can get 5,500 rpms from engine in neutral, however, when engaged in forward only a max of 2,000 rpms. I've checked compression of cyclinder and got 170 in each. Anyone have any ideas? Thanks.
<br /><br />Wrong forum. This is for Outboards.<br /><br />Moving to I/O and Inboard.