Decarbonizing old johnson

V

vaughneric2000

Cadet
Joined
Jun 5, 2004
Messages
28
Have a '79 60HP Johnson. Run good as far as I can tell--hits right RPM, idles well, etc. I have had no experience with decarbonizing a motor. What will this procedure do for the motor? I don't mean the big cloud of smoke I've heard about. I mean what is the purpose of decarbonizing? Will it improve performance? <br /><br />Gracias.
 
OBJ

OBJ

Supreme Mariner
Joined
Dec 27, 2002
Messages
10,161
Re: Decarbonizing old johnson

The purpose of decarbonizing is to create a large foul smelling cloud of smoke to irritate the neighbors......:-D....<br /><br />Naw....not really. The purpose of a decarb is to remove any carbon that may be built up in the cylinders, mainly around the piston rings. Carbon on piston rings will make the rings stick. If they stick, you get blow by and eventually a wiped cylinder wall or scoring. You may not see a improvment in performance, but the engine will last longer. As with any mechanical device, it's longevity depends on the care it gets.
 
M

mitchcole

Cadet
Joined
Jun 15, 2004
Messages
6
Re: Decarbonizing old johnson

Yup - I never did the decarbonizing. Damn Johnson ate a ring. After 5 years.<br /><br />Do it.
 
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