good spark but misses under pressure

[rusty2]

I have a chrysler 55 hp outboard motor model number 557hg serial number 5663. The problem is that it has good spark but when i put the plugs back in it start up sounds good then starts to lose spark in the bottom cylinder and runs rough then it will run good then loses the spark again. If anyone could help me on this it would be appreciated.

Also i was wondering if someone could help me out with the wiring to the key switch as to where the wires need to be hooked up to it. It has push in key choke.

 

[jerryjerry05]

Re: good spark but misses under pressure

I don't have a wiring diagram.But check the diaphram for cracks or holes.
Ethanol has ruined many a fuel line.Check your fuel system.J

 

[rusty2]

Re: good spark but misses under pressure

Ok i'll check out the fuel system. Ty jerryjerry05

I was wondering if maybe this could be a electrical problem to?

 

[jerryjerry05]

Re: good spark but misses under pressure

It a slim possibility the coil could be failing.I'd guess the pump first.J

 

[rusty2]

Re: good spark but misses under pressure

Ok i'll check them both, ty again