half power

[rayjgu3]

my motor 1987 20hp mercury 1020y
it used to run great now most times i only have about half power (speed)
it sounds just as loud but moves about half as fast, idles is rough most times
any other info needed, just say so

i am a new boat owner & am not afraid to get my hands dirty
if you have a favorite manual you think i should own let me know

thanks

 

[rayjgu3]

Re: half power

bump
things I've done
new fuel line in tank, from tank to engine, all fuels lines & filter under cowl.
rebuilt carb, new prop, and still only bout half speed.
I'm beginning to think maybe lower unit. before i crack this thing open is there any certain order of doing this, any tricks or hints.

 

[Buddaorf]

Re: half power

I just rebuild my lower unit. only couple issues i came accross was first make sure you have a puller and evenly pull out the Barring Carrier. Second was removing the Drive shaft, i scratched my head for a while till i figures out to take the nut off the Pinion Gear and to use a 2X4 and a vice and lightly hit the 2X4 against the housing to get the Drive shaft to seperate from the Pinion gear.

Over all the job went preatty smooth. Make sure you watch how things come out i got a peice i still reseaching how it goes back in but its gets put in when you reasembly the lower unit to the engine.

Have fun was a great learning experiance.

 

[rayjgu3]

Re: half power

thanks Buddaorf
I plan on taking a lot of pics. document it & post it, for all to refer to.

Buddaorf
what was your issue that had you rebuilding your lower unit?