Hi everyone
Picked up a 92 cbr600 that was partially disassembled by the previous owner. I'm trying to hook up all the hoses to see if the bike will run. I found a hose coming from the coolant overflow reservoir and I'm not sure what it connects to. Any help would be appreciated

 

There are 2 hoses going to the coolant overflow tank.
The first one comes off the radiator neck by the radiator cap. It goes to the bottom of the overflow tank.
Then second one comes off the top of the overflow tank and is not connected to anything.
It's just a air vent as the coolant expands and contracts.
I believe it just drops down by the front of the swingarm.

I have no idea what that is your are holding in your hand.
I don't believe it's part of the overflow hoses.
Is it a filter of somekind? More pictures? Can you see through it?

 

I believe that hose goes from the carb to the down where the thermostat is.

 

It appears to be the same as whatever this is in the manual. It's connected to the bottom of the overflow tank. Cant see through it

 

Ok, you're making me work on a sunday. I just went and dug out the manual and went and looked at my bike.

I've got a 94 F2 49 state model. I do not have that part on my bike. My overflow lines run exactly as previously described.

What I did find is that that piece is called a thermostatic carburetor valve.
It should go from the thermostat housing to the carbs.
I assume this is used to heat the carbs when cold and shuts off when hot. Many engine had something like this.
F2's did not. F3's however did - coolant flows through the carbs.

So it leaves me wondering:
Do you have an F3 motor?
Are your carbs F2 or F3?

 

The guy I bought it from said the engine had been replaced with an F3 because the starter blew a hole in the original engine's case. He did not mention whether the carbs were the original F2 carbs or not but I did not see a spare set of carbs on the broken engine in his shop so I can only assume they are the F2 carbs. The carbs on the bike only have the two fuel inlets which connect to the T joint and two additional inlets for what seems to be either vacuum or ventilation (haven't gotten that far yet).

 

F3 carbs have brown w plastic T joints for fuel. They also have 2 Y shaped metal joints for coolant.

 

Just looked into it more. They are the F2 carbs. That would eliminate the need for that thermostat hose?

 

Yes, in that case you could just cap it off at the thermostat housing and remove the hose/valve all together.

 

This is not that uncommon - unfortunately. This usually happens when someone who doesn't know what they are doing, tries to hook up the carbs and does it wrong.
I've seen people connect the gas tank cap drain to the carb vents. Then it rains and fills the cylinders with water. This hydrolocks the engine.
Since water doesn't compress, the engine can't turn over. Then when you press the starter button, it will break stuff including bent rods, broken cases and starts.