I've been reading obsessively on these forums to try and solve a problem with my engine. It ran rough, and wouldn't generate above ~1600 rpm. I removed the leads to each cylinder and - lo - the engine didn't change pitch at all when I removed #4.
Fearing the worst, I added MMO, hand-cranked, and let it sit for a couple of days. I ran the engine - nothing out of #4, a cold plug/lead, where the others were hot. I switched leads. No change. I prodded valves, added MMO, cranked (yes, through-hull closed), read more online and in the Atomic Bible, and MMO-d more. No change.
I decided to look in the hole of plug #3, to see if anything looked different; not much. On a whim, I put the plug for #3 in #4, and vice versa. I suspect you can guess the rest.
With a new plug (RJ12C) in place, she's running like a champ! I should have checked the obvious first.
With all that said, a question. Is there something I might have done that caused the plug (also a Champion RJ12C) to have failed? I used the correct socket, etc., although not a torque wrench. The plugs have ~5h on them, and were new earlier this season. #4 plug was sooty, suggesting it was running at some stage, but was wet with gas when I swapped to #3.
Fearing the worst, I added MMO, hand-cranked, and let it sit for a couple of days. I ran the engine - nothing out of #4, a cold plug/lead, where the others were hot. I switched leads. No change. I prodded valves, added MMO, cranked (yes, through-hull closed), read more online and in the Atomic Bible, and MMO-d more. No change.
I decided to look in the hole of plug #3, to see if anything looked different; not much. On a whim, I put the plug for #3 in #4, and vice versa. I suspect you can guess the rest.
With a new plug (RJ12C) in place, she's running like a champ! I should have checked the obvious first.
With all that said, a question. Is there something I might have done that caused the plug (also a Champion RJ12C) to have failed? I used the correct socket, etc., although not a torque wrench. The plugs have ~5h on them, and were new earlier this season. #4 plug was sooty, suggesting it was running at some stage, but was wet with gas when I swapped to #3.
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