coolant overflowing
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  1. #1
    Noob! chris79's Avatar
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    coolant overflowing

    hi guys i picked up a cheap 94 bike a while ago and im just getting round to making it road worthy ,, im having probs with the coolant leaking out the overflow bottle this is my first water cooled bike so im in new territory , whats going on folks ,, help ,,

    i have replaced the filler cap as i read threy can cause issues but thats as far as i have gotten

  2. #2
    The "Friends" of Officer Frank Poncherello crashmasterd's Avatar
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    A 94, eh? Well the more modern Speed Triples tend to puke all the fluid out of the overflow bottle no matter how many times you refill it, but never have a cooling problem. My 96 Trident tended to do this as well, but not as badly. (Basically an identical bike except for bodywork and suspension.) It tended to be happy with about 1/4 inch of coolant in the bottom, but far below the "full" mark.

    Personally, what I would do is make sure the radiator is full, put the cap on, empty the overflow reservoir, then run the bike for a few miles until it's hot. Then let it cool completely and check the level in the radiator. If it hasn't changed, fûck it and run it. Just check the level every run (when cold) for the first few rides. As long as the radiator isn't getting low, you're golden.

    That said, this may be a thermostat issue. In case you didn't know, the thermostat in this bike is inside the upper port side radiator hose. I have no idea why they did this. Residual Lucas hatred? Beats me.


    Trivia of note: When the early bikes were new they had a bad habit of having residual sand in the cases from the casting process. This would make its way into the coolant over time. This should not be a problem for a 25+ year old bike, but it could (in theory) cause problems with the water pump impeller. This could in turn cause overheating issues. Unfortunately the Speed Triple didn't have a temperature gauge like my Trident did (and various other T-300 models.) You might consider an aftermarket temperature gauge, at least temporarily. The water pump is not a difficult repair, but I wouldn't consider it until you're sure you have a problem. I'm guessing you do not.
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  3. #3
    The "Friends" of Officer Frank Poncherello dr_gallup's Avatar
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    Like Crash said, it's probably just puking out excess. Once it finds it's level it will stop. I think nearly every owner sees the nearly empty reservoir bottle & thinks it should should be topped off. Then gets surprised by seeing coolant on the ground and a nearly empty reservoir bottle.

    Could be something more but probably not.

 

 

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