Re: 1950s Evinrude 7.5 hp

[20mercman]

It idles and runs fine at slow speed, above half throttle, it starts to shake, and any more throttle and shakes so bad that you can’t run it. It has a brand new crank from Chinewalker, +.020 over bore and rebuilt ignition system. I was planning to swap the lower unit to rule that out, just have not gotten around to it. I am afraid I have a balance problem in the powerhead.

Steve