1992 V4 Johnson 120 hp shake hesitated at WOT

[chuongnino]

Hello folks. My first post here. Thank you in advance for reading and helping me out. I have this 1992 J120TLEND motor that was running fine. Today I started it before an outing and noticed it would shake and sputter as I pass 3/4th of the throttle. When I reduce the throttle it would back to normal. I attached a video link below for your reference.

I have checked all spark plugs connections. I also tried pumping the bulb when that sputtering happened but that did nothing. Could someone point me to the right direction of what I should do next?

 

[flyingscott]

That is normal to happen in neutral stop revving it up on muffs!!!! . You could get a runaway and front row seats to inside pieces of the motor becoming outside pieces. Revving it like that is on the top 3 worst things you can do. That is not a valid test of anything get it out on the lake