96 40hp merc.sea pro tiller, bogs and won't get on plane.

[Steve7722]

I had a problem with my Mercury would only run at full speed if I pumped the primer bulb on the engine. Pulled and cleaned the carb,it did same thing . Pulled the carb again and checked the high speed jet. I ran a tip cleaner in it to check for obstruction. Reinstalled and ran again idles good starts fine but when I try to get on top sputters bad .once I get it on top it ran fine at full throttle,but dies if you let off the gas.

 

[makomark]

I'd be inclined to rebuild the fuel pump...a serial number goes a long way to help us know what you are working with.

 

[fitz73222]

Is this a 4 cylinder or 2 cylinder engine?