90 hp mercury missing on 2 cyl.

[roadstarmoney]

runs on bottom cyl only at idle. seems to hit sometimes on high rev. can u tell me where eng # is and if reed valves could be the problem. this is and old 90 hp 2 stroke engine with 3 carbs. bought old pontoon boat with this on it. need help.

 

[Bosunsmate]

Re: 90 hp mercury missing on 2 cyl.

If reed valves you normally get a spit back or can feel air being pressed back too from engine compression/exhaust

 

[Laddies]

Re: 90 hp mercury missing on 2 cyl.

If the engine idles the reeds are OK as they only work at idle and very low RPM, you could have a bad lower seal if you have spark at higher RPM.