Re: 1968 18 hp evinrude

[wedgie]

I wouldn’t rebuild the fuel pump unless you know for a fact that is the problem .It can be pretty tricky to do. Set the low speed needle at around 1 turn open from lightly seated and adjust for smoothest running at low speed.

Turn the lights down low and hold the plugs against the block while spinning the flywheel (clockwise) with a socket driver in a drill. Look for nice snappy spark alternating between plugs . Spin it for a while and see if it is consistent. Even if it is, the points may need to be cleaned and gaped. If there is a cover plate on top of the flywheel remove it and see if the coils are cracked, in which case they will have to be replaced.

You can get a cheap compression tester From Harbor Freight for about $25.00 , or better yet borrow one. Take out both plugs and wind in the tester into one plug hole, with both plugs grounded, pull the rope until the needle stops climbing and take the reading. Do the same in the other hole and hopefully you will find less than 10 percent difference between them at around 110psi if I remember correctly what my 18 hp runs nicely on. I could be missremembering though

I am wondering if the throttle linkage is hooked up right.

Here’s a link to a parts diagram.

http://www.marineengine.com/parts/johns … 1968&hp=18