What is that cylinder projecting from the top of the rear drive housing? - Yamaha FJR Forum : Yamaha FJR Owners Forums
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post #1 of 12 (permalink) Old 11-27-2019, 02:10 PM Thread Starter
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What is that cylinder projecting from the top of the rear drive housing?

I changed my drive fluid for the first time today and noticed a shiny cylindrical object attached to the top of the drive housing. Anyone know what that is?

Candy Red
2014 FJR1300A
Tires: Metzeler Roadtec Z6

Previous bikes:
2014 Honda Goldwing Valkyrie
2013 Honda CB1100
1999 Honda Nighthawk 750
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post #2 of 12 (permalink) Old 11-27-2019, 02:12 PM
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Itís a vent.
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2008 Gen II
When I was a track-a-holic on my R1 & R6, I used to think that the FJR was an old man's bike. Then I got one and absolutely love it. Hey...wait a minute!
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post #3 of 12 (permalink) Old 11-27-2019, 02:21 PM Thread Starter
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Thanks, does it screw off?

Candy Red
2014 FJR1300A
Tires: Metzeler Roadtec Z6

Previous bikes:
2014 Honda Goldwing Valkyrie
2013 Honda CB1100
1999 Honda Nighthawk 750
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post #4 of 12 (permalink) Old 11-27-2019, 02:28 PM
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I have noticed this vent on all my motorcycles. I never messed with them (e.g. removed the cap etc.) so unless you have an absolute need, I would leave it alone
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post #5 of 12 (permalink) Old 11-27-2019, 03:12 PM
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It will come off if you try hard enough, but it's not designed to come off. Leave well alone.
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post #6 of 12 (permalink) Old 11-28-2019, 04:36 AM
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That's the Automatic Overflow Release Mechanism. If you overfill the drive by not following the instructions exactly that's where the excess oil spews out and coats your rear wheel and rim causing a butt factor 8.7 slip-n-slide.

And no, it not designed to come out. Leave it alone or risk terrible things.
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post #7 of 12 (permalink) Old 11-28-2019, 09:43 AM
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I am disappointed in all of these answers. That Cylinder is a multi-function device that requires some special knowledge to utilize.

A few of its uses and names:

1. Flux Capacitor. If your bike is equipped with this and you ride it at exactly 88 mph, hold on. You are going Back to the Future.

2. Fire Extinguisher. Yamaha did not want any of those BMWesque final drive fires so they installed a miniature fire extinguisher. Just in case...

3. Chaff rocket. If you are being pursued by a radar guided missile this device will discharge shards of aluminum and confuse the radar signal allowing you to perform evasive maneuvers and dodge the missile.

4. Government Mandated Speed/Location Monitor. Big Brother is watching...
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post #8 of 12 (permalink) Old 11-28-2019, 10:38 AM
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Quote:
Originally Posted by postoak View Post
Thanks, does it screw off?
Itís pressed in. Itís not meant to be removed.

2008 Gen II
When I was a track-a-holic on my R1 & R6, I used to think that the FJR was an old man's bike. Then I got one and absolutely love it. Hey...wait a minute!
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post #9 of 12 (permalink) Old 11-28-2019, 11:07 AM
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Quote:
Originally Posted by rbentnail View Post
That's the Automatic Overflow Release Mechanism. If you overfill the drive by not following the instructions exactly that's where the excess oil spews out and coats your rear wheel and rim causing a butt factor 8.7 slip-n-slide.

And no, it not designed to come out. Leave it alone or risk terrible things.
Just a reminder not to spin your rear wheel when filling the rear drive or you will overfill it and will get the spewing Russ describes.... not so sure it would get on the tire unless really overfilled, but not advisable to go there.

Ray
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2014 FJR1300A - Root Beer (sold)
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post #10 of 12 (permalink) Old 11-28-2019, 12:04 PM
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It's a Round Tuit. Yamaha adds these on the FJRs because these motorcycles are often used to travel to Dream Destinations. How many times have you heard someone say, "If I ever get a Round Tuit I am gonna ride my motorcycle to (you fill in the blank)?

Yamaha provides the tuit and the motorcycle. A really great package deal.

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