dies when hot 9.9 johnson

[Charles Johnson]

So just picked up a 14 ft troller hull and 9.9 Johnson
The motor idles but kind of rough like its missing took it
out on my 12 ft vhull jon and plenty of getup but it didn't feel
right like it was misfiring. Go . To turn back and the engine cuts
out instantaneously. Would not restart so I paddle my not so happy
self to shore still will not crank load up the boat Drive home maybe
30 minutes after it died fired right up but still rough and or missing...
For it to cut out so suddenly I'm thinking electrical. So something is
cutting out while hot power pack? Coil pack?

Any help is appreciated

 

[kimcrwbr1]

First thing is to check compression engine cold. Was it pumping water? Also check for open air spark gap. It must jump a gap of at least 3/8 brite blue snap with a spark gap tester. Do the compression and spark gap tests and get back with the results and the model number of the motor.

 

[Charles Johnson]

the model is a j10rcom was pumping water fine will do compression check on my lunch break gotta find a spark gap tester.

 

[kevinj]

http://www.marineengine.com/boat-forum/showthread.php?429396-1979-Evinrude-9-9-water-restriction

Definitely check water flow. See my thread about water restriction. I had replaced the water pump and thermostat but still had poor water flow. Finally after Joe Reeves suggestion I removed the power head and found the water tube grommet was deformed and blocking flow. Your problem could be the same issue.

Kevin

 

[Charles Johnson]

thanks for the tip kevin but i have a solid stream of water coming out

 

[Charles Johnson]

[video]http://sendvid.com/p2tbmywf[/video]

 

[Charles Johnson]

video of it running after it died^^

 

[Charles Johnson]

ok 90 psi both cylinders while running i can pull top plug it wants to die

pull bottom one will continue to run a lil worse but not much worse so does this mean coilpack?

 

[Charles Johnson]

just ran it for 30 mins on boat with muffs never died even used hair dryer on the powerpack to warm it up

 

[Charles Johnson]

bottom cylinder wont jump the 3/8 spark tester

 

[Charles Johnson]

top cylinder nice blue spark and snap bottom cylinder orangish colored spark not as loud

 

[kimcrwbr1]

Swap the coils and see if it follows the coil.

 

[Charles Johnson]

Swap the coils and see if it follows the coil.

will do today

 

[Charles Johnson]

will a 9 1/.2 x10 prop fit this motor? they have a few selections dont want a problem after i order it

 

[Charles Johnson]

so thru some new plugs in it when im reving it in neutral i can watch the clear fuel line from the pump to carb and it seems likes its pumping bubbles? is this normal?

 

[4renovating]

so thru some new plugs in it when im reving it in neutral i can watch the clear fuel line from the pump to carb and it seems likes its pumping bubbles? is this normal?

Did you ever solve this? Same problem here

 

[Sea_scavenger]

Did you ever solve this? Same problem here

Me too , engine dies when I remove bottom cylinder coil lead , swap the coils around and same cylinder is affected .had new coils and power pack, Have rebuilt carb . Can only think compression but both cylinders are around 90psi. Both cylinders receiving bright blue spark .

 

[racerone]

Broken reed valve is my wildest guess.