Black goop coming from prop exhaust. runs for 5 mins, shuts down and won't restart.

[StinkyMako]

'90 Yammy 115

New problem: Runs for 5 minutes, shuts down and won't restart. Also, black goop coming out of the propeller. I was thinking the carb needed to be cleaned when I noticed the black goop coming out of the exhaust at the propeller. (Not gear oil)

 

[kandil]

Re: Black goop coming from prop exhaust. runs for 5 mins, shuts down and won't restar

The black goop is unburned fuel I would look for fuel leaks around the fuel lines and the check valves that are on the powerhead
does it start again when it gets cold?
do you need to pump the fuel bulb or does it stays hard?
good luck

 

[StinkyMako]

Re: Black goop coming from prop exhaust. runs for 5 mins, shuts down and won't restar

The black goop is unburned fuel I would look for fuel leaks around the fuel lines and the check valves that are on the powerhead
does it start again when it gets cold?
good luck

Yes, it will start again when it gets cold...is that maybe a valve problem?

The bulb does not stay hard and needs to be pumped.

 

[kandil]

Re: Black goop coming from prop exhaust. runs for 5 mins, shuts down and won't restar

that sound like the fuel pump it will be a good thing to rebuild it and clean the screen change filter and tighten all connection clamps good luck

 

[StinkyMako]

Re: Black goop coming from prop exhaust. runs for 5 mins, shuts down and won't restar

The mechanic says the CDI is bad. (for future reference)

 

[douglloyd]

Re: Black goop coming from prop exhaust. runs for 5 mins, shuts down and won't restar

CDI Failure is EXTREMELY RARE.