WATER IN LOWER CYL

[Colin-R]

Hi, I HAVE A 1981 500/50 4 CYL which has started to misfire in the RPM band 1000 to 4000 on load and then graduley will start to run fine at top end. When I slow again the engin whant to cut out at 1000 " Misfire got worse" Grey sludge on lower cyl plug. Have Seloc manual and all. Merc has type 5 ignition " one coil per cyl " Is it the exhaust plate cracked or the lower bearing seals and o ring??. Have also just replace impeller with new kit.

 

[WillyBWright]

Re: WATER IN LOWER CYL

This is being discussed in a couple of other current threads, mostly "water in cylinder". Your answer might lie in one of those. They have larger motors, but basically yours is of the same general design.

 

[Clams Canino]

Re: WATER IN LOWER CYL

I'd suspect the lower seals, followed by the exhaust plate.<br /><br />-W