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Old 09-21-2009, 01:56 PM   #1
Kaw4Life OP
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Bolt Crash Bars to Motor / Good Idea ?

Most companies that make crash bars for the F800GS use the available pre-drilled/threaded holes that are on the motor. Tourtech makes the point that theirs do not. Anyone else think that a hard dump will bust/crack the motor mount locations?

Thoughts.
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Old 09-21-2009, 02:22 PM   #2
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Well, there have been several crashes involving bars that mount to the motor. None of them, AFAIK, have caused any damage to it. Maybe the engineers who designed those bars calculated the stresses involved and concluded that the risk was negligible. And it seems that they were correct.

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Old 09-21-2009, 03:34 PM   #3
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Thanks Dave !

My thought is that BMW would not have put them there if they would cause problems. The SW-MOTECH bars mount to the front set of holes as well as the other 4. I am thinking this will be quite strong.

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Old 09-21-2009, 04:10 PM   #4
EnderTheX
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These engines are meant to be a stressed component of the frame.

Besides, it is much better to put a shock through the recommended mounting holes than directly into your case!
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Old 09-21-2009, 05:04 PM   #5
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Quote:
Originally Posted by EnderTheX
These engines are meant to be a stressed component of the frame.

Besides, it is much better to put a shock through the recommended mounting holes than directly into your case!
Lost me on that one man, the recommended holes are in the case. The factory BMW bars mount to the motor case. As far as I can tell only one company mount to the frame (Tourtech).
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Old 09-21-2009, 05:07 PM   #6
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Crash Bars

Looks like a solution to a problem that doesn't exist. Has anyone heard of this "problem"?
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Old 09-21-2009, 05:40 PM   #7
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That is effectively the question I am looking to answer. Has anyone ever damaged these connecting points by bolting crash bars to them.
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Old 09-21-2009, 08:12 PM   #8
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If you do manage to dump your bike that hard just let the Ambulance people and your insurance company sort it out.
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Old 09-21-2009, 08:30 PM   #9
jodyz121
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Wunderlich and Touratech bolt to the frame.

Touratech bolts to the frame near the footpegs.

Wunderlich bolts to the center stand mount.
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jodyz121 screwed with this post 09-21-2009 at 09:20 PM
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Old 09-21-2009, 08:55 PM   #10
subybaja
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Quote:
Has anyone heard of this "problem"?
The 800's been out how long?
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Old 09-21-2009, 09:05 PM   #11
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Quote:
Originally Posted by subybaja
The 800's been out how long?
Almost two years now. November of 2007, to be precise.

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Old 09-22-2009, 12:20 AM   #12
Threewheelbonnie
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Never seen an F-twin go down, but engine bars ruined a trip for an airhead owner. He passed us, then went down on a micro climate under an autobahn bridge. Once we'd picked him and the bike up there was oil all over. The engine bar had ripped a stud out of the bottom of the motor and left a crack that may or may not have been weldable.

I don't know who made these bars, but they showed rather limited thinking. These bars were designed to protect when you dropped the bike at zero speed, all the fixing points were fine in compression. Once the load was in tension/shear, the weak point was the casting.

Personally, I'd go for bars that'll fold/up rip off in an 80 mph highway crash but will save the tank at zero speed. The current trend for massive engine bars is the issue to me as much as where they mount. If you must have the massive/survive at 80 mpg type, I'd want to be sure the mount would take the loads, which to me says frame mount.

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Old 09-22-2009, 12:59 AM   #13
subybaja
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Quote:
Almost two years now. November of 2007, to be precise.
Pretty short sample time, considering that the small percentage that get bars are further divided by the different bar brands out there...
But then, my KLR was made in 1967. (almost)

I dunno...seems goofy to me to bolt the protection onto the thing being protected. Kinda like mounting your car bumper to the fenders.
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Old 09-22-2009, 04:07 AM   #14
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Quote:
Originally Posted by RAD800
If you do manage to dump your bike that hard just let the Ambulance people and your insurance company sort it out.
Understood, not looking for high speed protection. Looking for the 15 mph protection. With a brand new 08 KLR at a LOW speed tip over cost about $800. The next day the SM-MOTECH bars came in. These are well designed for the KLR and have proven themselves more than once.

I like the TT bars but am thinking they are going to get in the way. My knees go way forward.
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Old 09-22-2009, 06:04 AM   #15
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Thumb Engine bars

No engine bar is going to survive every possible scenario. In the past two years every F800 that has been truly ridden off road has been dropped. Almost every picture I've seen has shown some sort of engine guard.
Where is the thread on cracked engine cases??? Lord knows BMW owners wouldn't be shy to complain...
In other engine guard threads people have posted post crash pics. This fellow went down in third gear on asphalt.
http://www.advrider.com/forums/showt...3#post10309523

Another asphalt crash

http://www.advrider.com/forums/showp...&postcount=216

As for drops on dirt there must have been thousands by now....
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