1968 55hp johnson bogging out

thepro

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Aug 23, 2007
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hi i havee a 1968 55hp johnson with hydro electric shift i was out on the lake crusing pretty good then engine started to bog down sounding like cavitating but cant get any power out of it i poped cowling off and as i put my hand over top carb covering throttle body the engine took off back to normal when i remove my hand bogged down again if i cover the top carb or at least three quarters of it runs fine i took carb a part cleaned it really well and it worked for about five miniutes then again same thing does any body have an idea what is wrong any help would be appreciated thank u
 
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