88 johnson 120

O

olm

Seaman
Joined
Nov 2, 2003
Messages
65
got most of my problems resolved since last post.<br />rebuilt carbs, changed head gasgets,new plugs and wires. starts perfect. now it seems to idle real high on the hose and very low in the water. what should the idle be? also lots of air blows out of pisser until t-stats open is this normal? :confused:
 
OBJ

OBJ

Supreme Mariner
Joined
Dec 27, 2002
Messages
10,161
Re: 88 johnson 120

olm....it's normal for an outboard to idle high out of the water. No backpressure, the effect caused by being in the water. I'm think'n idle should be 750 to 850 in the water.
 
W

walleyehed

Admiral
Joined
Jun 29, 2003
Messages
6,767
Re: 88 johnson 120

I'll agree mostly with OBJ, although I would try and set it closer to 700-750.<br />Thats where I ran mine untill I put fiber reeds in, and now I'm at 550.....
 
OBJ

OBJ

Supreme Mariner
Joined
Dec 27, 2002
Messages
10,161
Re: 88 johnson 120

Yeah walley....reeds are great...got'm in everthing I got...all two engines. :D :D
 
O

olm

Seaman
Joined
Nov 2, 2003
Messages
65
Re: 88 johnson 120

thanks for the info. About these reeds are they expensive? where could I get them?
 
OBJ

OBJ

Supreme Mariner
Joined
Dec 27, 2002
Messages
10,161
Re: 88 johnson 120

The reeds we are talking about are two stage reeds. Common brand is Boyesen, made by a company in Penn. <br /><br />The two stages allow for a more defined flow of the air/fuel mix to the cylinders. This makes idle a dream and you also get some fuel economy.<br /><br />They are not difficult to install but take time because you need to resurface the reed cages dead flat. This inturn makes the cages unusable for stock reeds. Also a hard sneeze, when the engine blows back through the carb, can damage them. But the adavantages, IMO, make them worth while.
 
9

93bronco

Ensign
Joined
Nov 11, 2001
Messages
962
Re: 88 johnson 120

1988 120/140<br />idle- 575 to 700<br />timing- 8 degrees ATDC<br />max spark- 18 degrees +/- 1 BTDC<br />full throttle 5000 to 6000<br />power rated @ 5500<br />powerpac rpm limit 6700<br />-<br />like said above idle will be higher on hose, no back pressure.
 
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