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Old 04-05-2010, 07:32 PM   #1
Gnarly Adventurer
Joined: Mar 2010
Location: St Louis Missouri - USA !
Oddometer: 395
Eh? F800GS - Heat from Radiator +suckz+

Yo mates, I am still learning all the ins&outs of my new F8ooGS. Overall It am very happy with the handling, performance, etc. Still not had time to get in the dirt..,,..,, but will soon.

One thing I noticed after about a 25 to 30 highway mile ride is that the HEAT from the radiator expells over both my knees and really gets WARM (no.... its friggin HOT). Thats just riding with Jeans... HOW miserable is it going to be with padded riding pants like a pair of Rev'its ...?

Now on a cool winter's ride, thats an asset. But I didnt buy this bike to ride in winter. I am thinking that most all my summer riding is going to be miserable with regards to the HUGE amount of heat thats direct right at my knees. I am suprised there is NOT an on-going thread on this.

Has anyone experimented with those deflectors that are sold in the aftermarket? Has anyone come up with a better solution? I realize radiator heat must exit somewhere, but ON me... on a HOT Summer's day?
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Old 04-05-2010, 08:30 PM   #2
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Location: Montreal, Qc
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Been there done that:

I have no issues with mine, rode all last summer and barely noticed. But then again, I don't wear jeans. The riding pants seem to deflect it better as well.
'09 BMW F800GS
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Old 04-05-2010, 10:04 PM   #3
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Location: Penticton, BC
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I think the consensus was that the riding pants actually improve the situation, although it seems counter intuitive.
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Old 04-06-2010, 12:11 AM   #4
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Location: northern NSW, Australia
Oddometer: 895
Yeah ive ridden a fair bit in 100+ 70%+ humidity days without problems, the only time i noticed it and it botherd me was on a short trip to the shops still wearing vented MX nylons, i don't think there are options here just live with it im afraid.

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Old 04-06-2010, 07:41 AM   #5
Joined: May 2009
Location: Sunny California
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Originally Posted by Bayner
I think the consensus was that the riding pants actually improve the situation, although it seems counter intuitive.
I have no problems in jeans or BMW Airflow riding pants. With jeans and in cold temperature I use neoprene knee protectors. But it doesn't matter: the heat doesn't bother me at all.
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Old 04-06-2010, 08:04 AM   #6
The Griz
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Joined: Nov 2008
Location: Minnesota
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I'd have to concur with the OP on this one. While riding in temps any warmer than 70-75 degrees F, it feels like two hot air dryers are being pointed at inside of my legs. This happens at speeds any higher than 25 mph or so, even up to freeway speeds. All F650GS2/F800GS's do it. It's normal. All of the heat from the extremely large radiator and the engine block escapes out of the sides of this bike and right on to the legs of the rider. If you're not feeling it, you're not riding fast enough or it's not warm enough in your neck of the woods! Either way, they all do it and it's normal. These same words have come out of my BMW tech's mouth as well.
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Old 04-06-2010, 08:23 AM   #7
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Joined: Dec 2009
Location: Playa del Carmen
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Hear, hear! Same “problem” with my F650gsT. I will admit all that heat felt great this past winter, we had a pretty cold one for our standards and the heat felt great on my legs. Can’t say the same in the summer, but feeling that heat did help me with a problem I had with the bike on two occasions.

For some reason air got into my cooling system. The first time it caught me by surprise. In traffic the bike overheated, I shut it down 3 times so the temp could go back to normal (it did not overheat while riding, only if idling in traffic) until I reached the dealer where they simply bled the air out of the radiator/cooling system. The whole time the bike blew out cold air from the radiator, no heat at all, it actually felt like cool air. The second time (1wk later) I felt cold air blowing from the radiator and I knew right away I had air in the cooling system again, and within 20 minutes or so, when stopped/idling the heat gage went up. I stopped, simply bled the cooling system again and all went back to normal. It has not happened since, but if the hot air ever stops blowing on my legs I will know there is a problem with the cooling system.

Maybe they designed the bike that way as to warn us of a problem with the cooling system
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Old 04-06-2010, 08:29 AM   #8
Joined: May 2009
Location: Sunny California
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Yeah, of course, I'm not riding over 25mph and I'm not living in California. So I don't feel the heat. You obviously know what you're talking about.

Let's put it that way: It just doesn't bother me as I have riding pants on for longer trips and around town I don't give a shit about a little heat at my legs. Maybe I'm just not as prissy with regard to heat as I am wrt buffeting
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Old 04-06-2010, 10:50 AM   #9
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Joined: Jul 2009
Location: Central Florida
Oddometer: 493
It do get hot occasionally, especially the boots up against the engine.

When it gets uncomfortable I move my feet out on the pegs and the hot air blows through. Also installed highway pegs which really bring relief.
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Old 04-09-2010, 04:52 PM   #10
tumbling tumbleweed
Joined: Jun 2006
Location: DFW / LAX / PRC
Oddometer: 184
I get hot air from mine also. Its a bitch in shorts, but in proper riding pants it doesn't seem to be a problem. I thought about installing these BMW wind deflectors;

but I decided it would only make the problem worse. A buddy of mine bought a used 800 and it had the wind deflectors installed. And indeed, it was way worse, because it deflected the 'cooler' ambient air away from the rider, so you got all the heat from the radiator, instead of just some of the heat mixed with the cooler air. I have thought about putting some black aluminum foil in the cut outs in the faring, trying to deflect the heat downward. Seems I get more heat out of the right side than the left for some reason.
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Old 04-09-2010, 05:15 PM   #11
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Joined: Oct 2006
Location: Olympia, WA
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Originally Posted by BMW_BIKER_KEITH
But I didnt buy this bike to ride in winter.
How you you get around???
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