I have been trying to find out what this small hose is on the right side of the engine. It looks difficult to replace, and so I have not bother to change it out in 15 years. I am curious to know what it's function is and how critical it is to the operation of the motorcycle.
What is the small hose on right side of engine?
- Thread starter leexnguyen
- Start date
I'm guessing if it's coolant it's the overflow/expansion pipe. Well known trouble spot.
Got a picture?
Upt'North.
Got a picture?
Upt'North.
The bike is a 1992 ST1100
As per Mr. Dwalby, I think you'll find this is the breather pipe. If not perished and leaking I would leave it alone.
Upt'North.
Upt'North.
actually, no, that's not the breather hose. I've never paid much attention to that hose, I don't know what it does.
John OoSTerhuis
Life Is Good!
It’s the crankcase breather hose. It’s attached to the bottom right corner of the water pump housing, shown in the image. Leads from there on up around the head into the ‘V’ and plugs into the nipple on the bottom right side of the air cleaner housing..TruST me.
John
John
Ah, thanks John, I didn't recognize it was attached to the water pump from the angle of the picture. It looked like a 1-2" elbow going from the block and back into the block. makes sense now, the upper part is the part that winds up through the carbs and into the bottom of the airbox.
I guess i can leave it alone for another 15 years.