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Old 07-03-2014, 07:42 PM   #1
mwood7800 OP
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Why do new Harley's run so hot

My brother has a new glide, not unusual to see the oil at 275. Harley says it's normal? I guess Dino oil won't cut it.

mwood7800 screwed with this post 07-03-2014 at 07:47 PM
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Old 07-03-2014, 09:02 PM   #2
MacMcMacmac
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My GS1100 would run that hot. They are at the limit if what air cooling can handle, especially with one cylinder directly behind the other.
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Old 07-03-2014, 10:12 PM   #3
Night Ryder
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I've heard that Harley's are tuned lean from the factory to pass emissions. This would contribute to the heat you're talking about

A question your brother should ask is how can he make his bike run cooler?
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Old 07-03-2014, 10:56 PM   #4
Contevita
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A question your brother should ask is how can he make his bike run cooler?
Go faster?
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Old 07-03-2014, 11:33 PM   #5
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One of the best parts of buying a Harley is the copious amount of aftermarket support...

In reading through the HD forums, a basic tune will drastically help reduce the engine/oil temp, while only minimally hurting mileage. When I was looking into Harleys, I found that a tuner should be the first thing added....
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Old 07-04-2014, 02:06 AM   #6
Road Program
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In my experience, all the twins I've owned and ridden have run hot, though none of them have run hot. BMW, Honda, Ducati...all hot. It would be a toss-up between the Honda and Ducati, though, as to which one can best fry an egg on the seat.
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Old 07-04-2014, 04:44 AM   #7
hexnut
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I wouldn't worry about it. The Suzuki S40 650 single I used to own would run around 300 degrees. Never caused a problem.
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Old 07-04-2014, 04:47 AM   #8
telejojo
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Why do they run at all?
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Old 07-04-2014, 04:58 AM   #9
FizDog
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After owning an Ultra with a 103 for 2 years, I think there is a variety of reasons they run so hot, but the best solution I've found so far is here....

http://www.wardspartswerks.com/cooling-fans.html

BTW, when my oil temp hit 300 once in traffic before I got the fans, the clutch plates swelled to the point where they wouldn't fully disengage. The bike would actually stall out if you held it at a stop with the brakes. I would say your brother is approaching the danger zone at 275. Since the fans, 230 is my norm in traffic and a bit less than that when cruising.
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Old 07-04-2014, 05:28 AM   #10
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Why do they run at all?
To get across the road.
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Old 07-04-2014, 05:40 AM   #11
kraven
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To get across the road.
I for one am looking forward to a time when Harleys can cross the road without having their motives questioned.
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Old 07-04-2014, 05:42 AM   #12
Barnone
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Go faster?
Get a cylinder head temp gauge on the rear cylinder if you are concerned about overheating.



You will find the highest temp is when you are going fast with a big load on the engine. The CHT on my two bikes with CHT gauges reduces at idle at a stop light.
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Old 07-04-2014, 06:08 AM   #13
phillyrube
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Originally Posted by mwood7800 View Post
My brother has a new glide, not unusual to see the oil at 275. Harley says it's normal? I guess Dino oil won't cut it.
I swapped out an air temp gage for an oil temp gage.....what a mistake. All I do is fixate on the oil temps hovering around 265 (normal). Before, I just rode the crap out of it.
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Old 07-04-2014, 06:16 AM   #14
Tip Over
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Bigger displacement, running leaner. My Wide Glide fries my legs in stop and go, so much that I go out of my way to keep moving nowadays.


Quote:
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Get a cylinder head temp gauge on the rear cylinder if you are concerned about overheating.
Depends on the front tire if the rear cylinder is the one that'll be hotter. HD switches which cylinder it monitors based on the hottest running, so I would look for the temp sensor that's already there before just assuming it's the rear.

Quick way to check is if it's a fat tire, the front runs hotter, if it's thin, then the rear. If it's a legacy front, or has a unique front end to the chassis, then look for the sensor
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Old 07-04-2014, 06:46 AM   #15
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gutting the cat helped me quite a bit.

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