elbow hose on thermostat housing: hard to replace?

mhscriven

Joined
Dec 12, 2005
Messages
89
Location
La Verne, CA
Hi guys. Hose blew just as i got to work. It looks like the left hose that goes to the thermostat housing (#9 in attached pic). Have the radiator off, looks like i'll need to take off tank and and the air cleaner housing. Bike is '07 1300.
How big a job is this going to be?
Thx.
Marty
 

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I assume you have removed the brace in front ot the thermostat housing that goes across the two frame tubes. I wanted to replace all the cooling system hoses on my ST when I did the 'stat and sanded away corrosion. Once I got to the thermostat, however, and saw how difficult the job was, I probed and squeezed hoses to see how they felt. Since most were ok, and it was such a big job, I decided to leave well enough alone.

Removing the tank is not a big deal. Since your bike is 15 years old, you might consider replacing the top to bottom tank hose. You will have to either run the fuel level down to the lower tank or use the fuel pump to pump the gas out in to fuel cans. The air box can be a bit of a problem since some guys here have had trouble loosening the screws holding it down. You MUST use a JIS screwdriver and plug all holes with rags so you don't drop pieces into the engine. Another reason I did not want to get into the hose replacement is I thought the throttle bodies had to come off to provide access. I'm not sure if this is true for your situation or even if it was for mine. Larry has said he can replace ALL the hoses on the stat housing from the front. I'd like to watch him do this - it would be a good learning experience. I suggest you PM him with your phone number and have him give you a call to discuss this before going any farther. Hover your pointer over the blue word @Igofar, > start conversation and PM him.
 
I have replaced most of my hoses by entering through the space behind the radiator. I also replaced the thermostat while in there. Larry helped me remotely to work through it - "thank you Larry (white phone), I could not have completed the job without your guidance".

It is certainly no easy job working in the small spaces available and especially if you are working with the ST sitting on the workshop floor. It sounds like you are half-way there though, so keep going I suggest. Just take your time, be patient, it can be done.

I found one of the nasty bits is that the new hoses are very tight to fit on the spigots they seat one. Also be aware not to mix the left (#9) and right (#7) hoses. One is slightly shorter than the other. I mixed mine up and incorrectly mounted them both (double pain). The part no, is on the plastic bag each hose comes in but not on the hose itself.

I replaced the 'O' rings (#24) - both sides, un-bolting the L&R housings that bolt onto the cylinder heads (sorry, they do have a name), so this might give you some confidence that you can complete your hose replacement. The space is tight, and my 'paws' are pretty large too.

Cheers, D
 
Marty:

If one of your hoses has failed unexpectedly, chances are that the other coolant hoses are very close to end of life also.

My suggestion is that you remove the airbox and the throttle bodies, and replace all the hoses under the throttle bodies at the same time. Obviously, it will take you more time to remove and replace the throttle bodies, but in the final analysis it will take less time to do that than it will to replace just the failed hose now and then have to remove the throttle bodies to replace another failed hose in the future.

FYI, below are two pictures that might be helpful. One shows the front two of the four hoses on the ST 1300 thermostat. The other shows what it looks like when you have removed the throttle bodies... there are quite a few hoses down there.

Michael

Thermostat Hoses
Thermostat Hoses.JPG

Top View of Engine, Throttle Bodies Removed
Temperature Sensor.jpg
 
Regardless of how many hoses you replace, a small (emphasis on 'small') smear of silicone paste on the metal spigot will help slide hoses on easily. If you put paste on the metal spigot, excess will be scraped off as the hose goes on and you can wipe off the excess. If you smear it inside the hose, excess is scraped off and remains inside the hose.
 
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