Colin Christie
New member
Hi I have just bought a small fletcher speedboat with 30hp Yamaha 3 cylinder oil injected outboard. The engine was running perfect for 2 days after I bought it then, it started to miss, I'm guessing by the noise?? It sounds exactly like this engine I found on YouTube http://youtu.be/xeruVWj0DBA i tried every spark plug and all are sparking, swapped the coils to see if I could figure out if it was bad coil, nothing obvious struck me there, but I am new to boating, I really need your opinions and help, what could it be? Ps when I turn it off and remove spark plug caps and start it runs fine until she gets full throttle for around 10 seconds then starts missing, and doesn't really stop until turned off and back on again. I'm lost!! 
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