Rear hub on my 2012 runs very hot!! Normal?? - Yamaha FJR Forum : Yamaha FJR Owners Forums
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post #1 of 16 (permalink) Old 06-23-2020, 07:03 PM Thread Starter
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Rear hub on my 2012 runs very hot!! Normal??

When driving my bike any distance at all the rear hub gets extremely hot, even though I use Yamaha's rear end lube. You can touch it, but you can't leave your hand on it for more than a few seconds, or it will burn you. Ironically, the oil inside the rear end hub does not get that hot to the touch. I drained the rear end oil and there are no metal fragments on the magnetic portion of the drain plug and the oil looks fine. My friend's 2007 FJR gets even hotter. Weird. What have others noticed with this?
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post #2 of 16 (permalink) Old 06-23-2020, 07:52 PM
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Anything over about 130F is too hot for human touch.
If as you say oil looks fine, drive on. No issue


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post #3 of 16 (permalink) Old 06-23-2020, 09:13 PM
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Ride on.... don't know how you'd make it run cooler.

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post #4 of 16 (permalink) Old 06-23-2020, 09:55 PM
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I heard using the super special top secret Yamaha final drive fluid makes your diff run at 98.6 F.....
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post #5 of 16 (permalink) Old 06-23-2020, 11:18 PM
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Normal. Have you guys been applying a little grease (VERY little) to the external gears of the wheel and final drive? I use just a dab or two of moly paste or marine grade wheel bearing grease.

Russ
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post #6 of 16 (permalink) Old 06-24-2020, 08:40 AM
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You might want to check if your brakes are dragging. How hot is the rotor? Brake pedal sticking possibly?

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post #7 of 16 (permalink) Old 06-24-2020, 09:07 AM
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Motorcycle tires can get quite hot. After a decent ride, put your hand on the tires, wheels, and rear hub. If the temps feel generally the same, it's likely normal due in part simply to heat transfer.

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post #8 of 16 (permalink) Old 06-25-2020, 07:03 PM
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See thermal image that I took a few months ago after a ride. Yes, the final drive does get quite warm, but that's normal.



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post #9 of 16 (permalink) Old 06-28-2020, 11:24 PM
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I went for a ride with my wife this afternoon / evening. Rode from London, ON to Bayfield, grabbed supper and then rode back home. I took a thermal images of the rear hub, exhaust, and tires just for fun. Ambient temp was 22C (72F) when we got home. We rode approximately 120 km each way. The images were taken approximately 10 minutes after we got home.

Rear Hub Temp: 62.6C (144.7F)


Exhaust Temp: 132.3C (270.1F)


Front Tire Temp: 40.7C (105.3F)


Rear Tire: 44.5C (112.1F)


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post #10 of 16 (permalink) Old 07-03-2020, 11:36 PM
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sweet flir toy, I've been using infrared temp gun since they came out, but I might have found me a new "tool toy"
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