919 upper radiator hose diameter? - Wrist Twisters
 
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post #1 of 7 Old 03-15-2017, 06:53 PM Thread Starter
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919 upper radiator hose diameter?

So I drilled a hole in my filler T for the koso gauge and it didn't hold up so I have to order a T adapter. I'm going to order the koso sensor adapter, but I'm not sure what size to order. Anyone know the diameter of the upper radiator hoses?

Yes I know I can take it apart and measure, but figured I'd ask because the bike is still tucked away for the winter.

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post #2 of 7 Old 03-17-2017, 07:52 AM
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I measured the upper radiator nipple where it enters the hose, 25mm.

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post #3 of 7 Old 03-19-2017, 12:30 PM
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Quote:
Originally Posted by NealC View Post
I measured the upper radiator nipple where it enters the hose, 25mm.
Do you mean the ID of the nipple?
I'm keen to know for sure as I am intent on getting a Koso temp gauge with inline hose adaptor.

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post #4 of 7 Old 03-19-2017, 01:13 PM
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That is the OD of the nipple, which would correlate to the ID of the hose. Not sure of the ID of the nipple, I would suspect it to be 23-24mm, as the wall would be thin.

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post #5 of 7 Old 03-19-2017, 01:18 PM Thread Starter
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Thanks a lot I'll give that a shot! If it's too big I'll just return it and get the smaller one :-) Drilling out the filler neck wasn't a terrible idea but that plastic is so thin and I think that is why it's leaking.

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post #6 of 7 Old 03-19-2017, 01:54 PM
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I forgot I have a spare rad!
Just went and measured it.
The largest part of the barb on the rad inlet is 27 mm.
The shank OD behind the barb is 25.5, highly suggestive of being a nominal inch (25.4).
The ID of the hose should be a bit snugger than just size for size on the shank area where the clamp will squeeze down the hose.
So, no way smaller than a 26 mm adaptor male OD fitting is my thinking.
Too bad I don't have a spare unused stock hose to see what their ID is to know what Honda intended for class of fit.
Also, locating the adaptor up near the rad inlet looks like a good idea.
There's room and the hose run is straight.
More importantly, it would go where it should in terms of the overall coolant flow regime, as in after the cylinder head, past the (open)thermostat, in other words sensing the highest temp zone of the system once the 'stat is open and the system is up to temperature.

I just looked at the Koso website, their sizing goes in increments of 22, 26, 30 so trusting the 26 means shank OD, then 26 would be the size.
BUT the Koso FAQ instruction is to measure the hose ID for surety of correctly selecting.
(Nice would be a compact combi gauge to show both oil and water temps)

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post #7 of 7 Old 03-19-2017, 01:57 PM Thread Starter
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Yep, koso only makes a 26 or 22 so I'll try the 26. That's is the exact spot I was thinking as well!

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