Yamaha 85hp outboard ignition issue?

So I have a 2018 Yamaha 85hp outboard (2 stroke), with only 91 hours on it. If you have the engine running, and you pull the spark plug leads off each spark plug, one at a time, the RPM should drop if the engine is running on that cylinder. With that being said, when I pulled the spark plug leads off the middle and... show more So I have a 2018 Yamaha 85hp outboard (2 stroke), with only 91 hours on it. If you have the engine running, and you pull the spark plug leads off each spark plug, one at a time, the RPM should drop if the engine is running on that cylinder. With that being said, when I pulled the spark plug leads off the middle and bottom plugs, it did that. However, when I pulled the lead off the top plug, the engine actually revved up. This has me totally baffled.
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