Yamaha 90 2-stroke air hose?

[Ricky_rich]

I recently bought this outboard and started it for the first time yesterday. Runs like crap and air comes out of the little broken hose. Whats wrong here, should it be connected somewhere?

 

[99yam40]

there is nothing on a Yamaha 2 stroke 90 that normally pumps air out of a small hose

 

[flyingscott]

Find the other end of that hose. Looks like an oil recirc line

 

[Ricky_rich]

Find the other end of that hose. Looks like an oil recirc line

I have been looking but can't find other end?
My motor is from -88. An -89 and newer dont have this connection?

 

[flyingscott]

Look towards th bottom of the block

 

[racerone]

Were you running the motor on a hose ?---Boat launched and at a dock ?

 

[Ricky_rich]

Were you running the motor on a hose ?---Boat launched and at a dock ?

I have only run it at home on a hose.

 

[Ricky_rich]

Look towards th bottom of the block

Been looking everywhere but I can not find any connection for this small hose. Could you provide a picture maybe?

 

[99yam40]

the only small hose coming off of an outboard that I can think of would be for a speedometer.
but I have no idea how it could be blowing air out when motor is running on muffs

 

[racerone]

Post a picture from further away to show the location.

 

[Ricky_rich]

Here is the whole head with the hose plugged.
I noticed that the colour of the cylinder part don't match head and intake. Someone might have replaced it back in time.
There are two hoses going between intake, and one from intake to cylinder 2, should it be four hoses in total?

 

[racerone]

This motor has been apart for some reason.----All bets are off as to the reason for that hose.-----It leads to the crankcase and I see no reason to tap into crankcase compression !

 

[99yam40]

recirculation of liquid condensed fuel from the bottom of each cylinder's crankcase is the only thing I can think of.
should be check valves involved at least one end