Ad 11 Johnson

[Tubs]

No idea what a Ad 11 Johnson is but I’m struggling with this
being an ignition problem. You say “coils & condensers”. If there is an
ignition for each cyl. it doesn’t seem likely both are dropping out & coming
back at exactly the same time unless there is some kind of ignition cut off
shutting down the motor. Fuel seem to be a more likely the issue. As you
have changed both the carb and the tank that leaves me to suspect what is
in between. My suggestion would be to take the fuel line off at the carb and
pump up the tank to see how much fuel you get.
Tubs.

A "Boathouse Repair" is one that done without having tools or the skills to do it properly.

[crosbyman]

see list

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[crosbyman]

good point yet  he indicated the tank works fine on another motor

if electricals were never redone  bad caps …both having reached a useful life  are becoming prime suspects has suggestted by LLOYD

an easy  inexpesnive  decision after  66 years  !

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[Tubs]

It would seem he has eliminated the tank
and the carb. as an issue. What I’m suggesting
is a test of the fuel system between the tank
connection and the carb. Possible blockage in
the line or an issue with the connector?
Tubs

A "Boathouse Repair" is one that done without having tools or the skills to do it properly.

[russ]

Did  a 7.5 Evinrude a few months  ago same symptons pulled the intake manifold off both gaskets were no good.Sticky and what was left of them blocked off a few of the little holes.Replaced both gaskets and it runs like new. Just a thought.Only takes 10 min to pull carb and intake off…..

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fleetwin

[Donald Keller]

thank you crosbyman for the information an links on condensers, and all your help…I can use this….I put new condensers an new points in today…motor still runs like a minute then dies…I will have to order me some new coils for it.Hopefully new coils an wires will fix it ??

[Donald Keller]

Thank you Boathouse…I will pull fuel line of carb to see how much fuel is going through the line..I have another connector if that’s what it is..thankyou you  again

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Tubs

[Donald Keller]

Thank you russ…I will check those gaskets also…will have to order the gaskets I guess..thanks to all of you for information

[crosbyman]

coils are always a gamble… old coils get all cracked up and if yours  show no  indications   of cracks (see pic)  they may be good but…… yes they can react to heat although a minute run time does not genetate much  heat to warm them up.        Primaries  ohms  usually read   a few ohms  and  secondary  4-8 Khoms depending on manuf.

plug wires can go open  midway  in a  flex bend under the  mag plate.     which is also  a good investment  to put in new ones in

one  condition that can impeded inflow of fuel  is bad crankcase seals which will let  air get  sucked  in instead of  precious  fuel from the carb… hopefully   this is not your situation.

keep at it… patience brings joy… eventually  🙂

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[crosbyman]

cracked coils …. your’s are surely not that bad  !!   but they can  fire to ground unded the unseen part …. touching the mag plate.

one thing you should check is presence or absence of sparks the moment it dies on you…     loss of ignition sparks  would confirm the cause .

if you do have good sparks      (test quickly)               fuel is likely still the main issue to chase down .

check the  air nipple  hose feeding air pressure to the  side tank connector … make certain it is not cracked.

also check the  small vertical hose on the side of the powerhead.

further down the road you may have to ckeck the  check valves controlling/feeding  crankcase pressure to the tank.  they sit  behing the intake maifold plate.

if your engine runs a minute it should  have been able to build up  “some” pressure in the tank …test by openning the tank cap  quicly when it dies it should go pssst! as air  escapes.

one test you can do after  you pushed the primer button and started the engine  is to lift the tank above the  engine  to gravity feed  the fuel to it .

btw… did you ever do compression test on the cylinders ??

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