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Author Topic:   Oil Fouled Sparkplugs
minimontauk posted 08-30-2004 12:40 PM ET (US)   Profile for minimontauk   Send Email to minimontauk  
I have a 97' 48 HP Johnson. The oil ratio is 50:1. The engine ran great all summer, but over the last two weeks I noticed a steady decrease in performance to the point that it runs about 1/4 speed at WOT, run rough and stalls at low speeds. I popped out the sparkplugs, and they seemed very gummy with oil. I'm a newcomer to outboard engines, in a car I'd say i needed a hotter plug. I'm using the recommended plug for the engine. What gives? Should I expect to replace plugs twice in a typical season? These were brand new as of June, and I only use the boat on weekends. I'm ferrying kids and gear around mostly at slow speed, only had it opened up once or twice. Do I need to "burn it" a little to keep from fouling plugs?
2manyboats posted 08-30-2004 01:11 PM ET (US)     Profile for 2manyboats  Send Email to 2manyboats     
Usualy there are choices in plugs for slow speed and normal operation. If you are pre mixing you do need more time at high speed to keep the plugs clean.

I believe most auto oilers go to 150 to 1 at idle.

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