1977 70 hp johnson

[ashion]

A weak starter prevented my motor from sparking. Once i figured that out, i figured out spark plug 2 isnt sparking because of a bad power pack. I was told it wouldnt do much damage to run the motor off just 2 coils/cylinders/spark plug. Is that true or false? I do not want to do any further damage to the motor, I just need it to run for one weekend and I can get the power pack.

 

[flyingscott]

I wouldn't do it just because if it is actually an intermittant spark. The motor could end up misfiring and that will cause damage.

 

[emdsapmgr]

If the carb that feeds the dead cylinder is still pumping fuel/oil into that cylinder every stroke-that would mean that the cyl is getting lubrication. At that point, I doubt you'd damage it much. (I'd probably verify to be sure that is happening....) Only problem will be that the engine won't make much hp and it will burn a lot more fuel as you crank up the throttle to make even some hp- the bad cyl will just be pumping unburned fuel/oil down the exhaust pipe. Just seems like an exercise in futility..