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Old April 5th, 2017, 05:39 AM   #1
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Does HS939 Oil Cooler Fit on HS821?

I have a 2014 HS821, just bought it second hand. Great bike but it runs pretty hot, especially two up in Bangkok traffic, and especially at the moment which is our hot season. I just saw the HS939 has an oil cooler which the 821 does not. Can anyone advise on whether this oil cooler can be used on an 821?
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Last edited by mattbkk; April 5th, 2017 at 05:47 AM. Reason: added pic
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Old April 5th, 2017, 08:08 AM   #2
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I believe in the current state, no. At least not easily. This is because the oil pressure sensor would have to be moved from it's current location.
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Old April 5th, 2017, 09:43 AM   #3
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Oil pressure switch relocation isn't a huge issue, all it essentially requires is a new fitting attached into the clutch side case, then the oil cooler lines attached.

I would be most concerned about what direction the oil takes through the various galleys within the motor, or if the oil return would actually do anything on the 821 motor. Another aspect to consider would be if the oil pump on the 939 puts out more volume than the 821.
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Old April 5th, 2017, 10:07 AM   #4
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I've never found my 821 to run hot, even on hot days. Unless you're not moving at all. In fact I thought my thermostat was stuck open because it runs on the cool side.

I would look into water wetter and maybe a manual radiator fan switch before machining the engine to fit an oil cooler.
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Old April 5th, 2017, 03:50 PM   #5
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I did many thousands of miles in 100+F traffic. I would normally see the coolant temp hit 212F and not a digit more. I never knew the radiator fan was running until I turned the motor off. I am impressed at how little heat I feel in my crotch and legs. Every other bike I owned would just spew hot air onto my thighs and radiate to my crotchal region.

I would entertain this mod if it were easy, but not necessary in my opinion.
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Old April 5th, 2017, 07:26 PM   #6
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Thanks for the replies. I have never heard of a water wetter and will look into it. If anyone has experience with that, please share. I know two other HS821 riders here in Thailand and we all have the same issue with our bikes running hot in the city.
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Old April 5th, 2017, 08:53 PM   #7
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Do you have radiator guards on your bike? Just having those will keep the radiators extra warm by restricting airflow to the rads.
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Old April 5th, 2017, 09:47 PM   #8
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Glad to hear you're all doing fine in Florida and California. Roads in Bangkok are much tighter than American cities (I have visited LA, Miami, NYC etc) so there sometimes isn't room for lane splitting etc. You can be crawling along or stationary for 10-20 minutes at a time and the ambient temperature is horrendous. I've seen at least 105 degrees C on the gauge (221F), heat pours out of the bike, especially the left side. I have had to stand on the pegs to get my thigh away from it. There are no radiator guards on this bike Zibbit, but thanks for the idea. Actually it's in pristine condition with no mods at all. So I'll look into the wetter and will be grateful for any further suggestions.
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Old April 5th, 2017, 11:26 PM   #9
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I would suggest maybe wrapping the exhaust or thermal coating it. It might lower the ambient temperatures around the bike which might help keep the bike cooler, and as an added bonus keep you cooler in the mean time.

Water Wetter from what I understand is just another type of coolant with a similar boiling temperature. What you're trying to accomplish is more cooling. Typically that's done via heat extraction from the radiator.

If you've got a radiator shop that can produce thicker core radiators, then get them to re-create a larger or thicker radiator using the same mounting points. Just having a more efficient design with a larger core can extract more heat from the fluid, thus keeping the temperature lower.

Another option, as posted above is adding another fan on a switch that you can control to push more air through the radiator.. Unfortunately the only downside is you'll be feeling that extra warm air rushing past your thighs.
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Old April 6th, 2017, 04:24 AM   #10
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Quote:
Originally Posted by kuksul08 View Post
I've never found my 821 to run hot, even on hot days.
I would have to look at where it is actually located, but it may have to do with where the Coolant temperature sensor actually is in the loop. I have seen my bike to appear to run cool, and not get to temp on colder days <50 F.

This really shouldn't happen with a thermostat in the loop. Unless it doesn't work that well. I've never tested it to see when it really starts to open.
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