[90merkdoesnotalwaystart]

I have a 1987, 3 cylinder, 90 H.P. Mercury Outboard with a jet drive. Operation in lake or river: Motor will not start after being run initially on cold start up or after being run for a while and shut down hard to restart with warm or hot engine. With hose attachment in yard: Motor starts every time. I have heard the impeller in the jet drive needs to be reshimed to alleivate this problem, but need more info. regarding this. Appreciate any help. rws

[Clams Canino]

Is that a 3 or a 6 cylinder? 1987 was the changeover for the 90's.IF it's the six, a leaky exhaust plate can be a a known culprit. If you're getting water in the cylinders, fix it before damage escallates. Also they cool off pretty fast, try a cold start on it.If it's the 3 cylinder 90, OR a jet drive issue, someone else can take it from here.-W

[90hpmercuryproblem]

its a 3 cylinder.

[Mercury140-I6]

A friend of mine had a Bayliner Reflex with a 90hp jet that did the same thing. It turned out to be one of the Power Packs, or stitches. Hope this helps.Craig

[90merkdoesnotalwaystart]

When you say powerpacks, are you referring to the powerhead?? What do you mean by reference to stitches??

[Mercury140-I6]

Power packs might be the wrong term. Stator and Trigger are the terms I was thinking about. Have them checked.Hope this helps.Craig