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Author Topic:   Oil Fouled Sparkplugs

minimontauk posted 08-30-2004 12:40 PM ET (US)
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)
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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Author	Topic: Oil Fouled Sparkplugs
minimontauk	posted 08-30-2004 12:40 PM ET (US) 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) 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.