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Discussion Starter #1
CRF1100L ATAS ES DCT 2020, about 4500km on the clock.

Yesterday I noticed several coolant fluid spots on the right side of the bike, near the catalysator (see pic 1 and 2).

I think it's somekind of wastegate on pic 3 (like my former BMW R1250RS/R1200RT LC had, only those bikes had a rubber hose attached to a metal tube) which "leak" coolant fluid when the pressure is too high (or something like that). It's that little hole to the right side of the black bolt in the middle of the pic.

Some folks have the same "issue"?
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?
 

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Discussion Starter #3
Yes, 100% sure it's coolant, exactly the same as my former BMW's which also "leaked". It's also the same green colour.
 

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I have had that. Same spot. I have always checked the coolant and it must not be that bad a leak to make a difference in the level. I have only noticed it on long ride days. I don't know if ignoring it is the correct answer, but that's what I've done.
 

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I think it's supposed to "leak", it's designed doing that. However if it's leaking too much you have a faulty waterpump I think ;)).

Any specialists in the house?
 

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Yes, 100% sure it's coolant, exactly the same as my former BMW's which also "leaked". It's also the same green colour.
Ah, okay, ... I now see in the last (third) image the green fluid.

I have not seen this yet on the AT.

However, I have on another bike and it seemed to be related to expansion overflow.

Plumbing leaks are usually more traceable to a hose clamp, or worse, a gasket.
 

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It may look green? Honda coolant is blue. My '17 has an overflow bottle under the right side pillion peg.
 

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Mine '20 ATAS to, but it has nothing to do with the overflow bottle, it comes out of that little hole on picture 3, like an overflow hole or something.

Can also be blue, looks like a bit blue/greenish.
 

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From this thread it sounds "normal".

 

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CRF1100L ATAS ES DCT 2020, about 4500km on the clock.

Yesterday I noticed several coolant fluid spots on the right side of the bike, near the catalysator (see pic 1 and 2).

I think it's somekind of wastegate on pic 3 (like my former BMW R1250RS/R1200RT LC had, only those bikes had a rubber hose attached to a metal tube) which "leak" coolant fluid when the pressure is too high (or something like that). It's that little hole to the right side of the black bolt in the middle of the pic.

Some folks have the same "issue"? View attachment 57468 ?
Its the bleed pipe for the water pump, if you look up under there you will see a small fitting with a barb on the end (there is no hose) . A small amount of leakage is fine, a large amount means the water pump seal has failed. Its a vent to stop water from being able to travel from the water pump through the drive to the gearbox full of oil. Honda didnt want a faulty seal to fill your engine with water as that would be bad. You do not have a problem.
 

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Discussion Starter #11
Thanks. I was under the impression the coolant fluid comes out of that little hole (see my 3rd picture), but you talk about a small fitting with a brab on the end? Mine is a '20, maybe Honda changed it?
 

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Thanks. I was under the impression the coolant fluid comes out of that little hole (see my 3rd picture), but you talk about a small fitting with a brab on the end? Mine is a '20, maybe Honda changed it?
See the little bit of white goop hanging down in the third pic, just up from that you will see a small tube going accross the bike (its sort of green with fluid around it at the moment) thats got a barb on the open end (normally thats designed to have a tube over it with a spring clip behind the barb, but not installed on the AT) that is the pipe that the fluid comes out of. It drains the middle of the water pump shaft oil seal on one side and water seal on the other side, it lets fluid through from either seal and it just drops out the tube.
 

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See the little bit of white goop hanging down in the third pic, just up from that you will see a small tube going accross the bike (its sort of green with fluid around it at the moment) thats got a barb on the open end (normally thats designed to have a tube over it with a spring clip behind the barb, but not installed on the AT) that is the pipe that the fluid comes out of. It drains the middle of the water pump shaft oil seal on one side and water seal on the other side, it lets fluid through from either seal and it just drops out the tube.
Do you mean this?
57572
 
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