74 johnson 2 h.p.

K

Keith Jones

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Oct 15, 2008
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:redface: 74 johnson 2 h.p. has spark but will not fire with fuel. What cylinder pressure range is satisfactory? If pressure is low is there a likelihood that crank seals need to be replaced as well as new rings providing piston seems o.k.?

Keith
 
tashasdaddy

tashasdaddy

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Re: 74 johnson 2 h.p.

my 76 2 hp johnny, compression is around 70-80 psi, but you have to pull the rope till the guage quits going up. what does your plug look like? do not use starting fluid on it. only premixed fuel, you can spray some into the carb, or put a little in the cylinder.
 
JB

JB

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Re: 74 johnson 2 h.p.

Go to the Engine FAQs Forum and do "Outboard won't start".

Let us know what you find.
 
K

Keith Jones

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Oct 15, 2008
Messages
6
Re: 74 johnson 2 h.p.

Thankyou gentleman for your advice on the 2 horse. Plug is good and can generate "explosion" of fuel in chamber if grounded on outside of plug hole but if fuel mixture is squirted into chamber and plug inserted, it never fires. I will do a re-check on compression. Perhaps I should do a sprk strength test. There seems to be lots of spark across gap on plug but it never ignites fuel in chamber.

Sincerely
Keith
 
tashasdaddy

tashasdaddy

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51,019
Re: 74 johnson 2 h.p.

are you using a champion RJ6C spark plug, gapped at .030???? that is what it should have.
 
JB

JB

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45,907
Re: 74 johnson 2 h.p.

Tell us what results you got when you did "Outboard won't start", Keith.
 
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