919 Broken Exhaust Mount - Wrist Twisters
 
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post #1 of 26 Old 06-10-2008, 10:03 PM Thread Starter
 
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919 Broken Exhaust Mount

I found out a week ago that it's broke;explains the harmonic resonance at 6k rpm.
Sugs and XRMikey have the same problem.
This is probably been covered already, but I'm just wondering how many others have checked, how many are broken, and how many of you don't know WTF I'm talking about? :001_smile:

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post #2 of 26 Old 06-10-2008, 10:11 PM
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Same deal here. Would be interested in knowing if there's an easy fix for those of us that don't have a close relationship with a local welder

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post #3 of 26 Old 06-11-2008, 04:21 AM
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Had the same problem with my 02.. And I made a bracket and used the area that the centre stand would use to mount my bracket to the frame..

https://www.wristtwisters.com/forum/s...ead.php?t=2872


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Originally Posted by cmelnick View Post
Same deal here. Would be interested in knowing if there's an easy fix for those of us that don't have a close relationship with a local welder

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post #4 of 26 Old 06-11-2008, 04:41 AM
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you don't have to take the welder out on a date to pay him to fix something for you. small patches & fixes probably aren't as expensive as you think.

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post #5 of 26 Old 06-11-2008, 04:58 AM
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Happens. More people need to check it before complaining about peg or handlebar buzz.

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post #6 of 26 Old 06-11-2008, 08:40 AM
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Quote:
Originally Posted by CB900F2 View Post
Had the same problem with my 02.. And I made a bracket and used the area that the centre stand would use to mount my bracket to the frame..

https://www.wristtwisters.com/forum/s...ead.php?t=2872
I remember seeing this thread and thinking I should do it, but now I'm wondering if that bracket will interfere with the Phobman stand?

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post #7 of 26 Old 06-11-2008, 08:57 AM
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Quote:
Originally Posted by HondaJim View Post
Happens. More people need to check it before complaining about peg or handlebar buzz.
Thanks for reminding me, I gotta go check mine tonight....got a new buzziness over the w/e and just chalked it up to me being anal.




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post #8 of 26 Old 06-11-2008, 12:39 PM
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Mine is cracked too--though I haven't noticed any difference in the ride quality. Regardless, I would like to get it fixed sometime in the future.

I wonder if it can be MIG welded or if it requires TIG (generally more expensive)?

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post #9 of 26 Old 06-11-2008, 01:18 PM
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Broken exhaust hangers were a BIG topic on the Hornet's Nest years ago. I can't explane why mine isn't broken after nearly 30,000 miles considering it has destroyed 2 sets of crash bars and a front fender.

Wondering if the kind of cans you have on has any effect? I think my Satos may have reduced vibes a bit. It's been so long that I can't remember what the cored stockers felt like.

I've also heard it was a good idea to disconnect the battery before doing any sort of electrical welds because of the possibility of electrical/electronic damage to the bike.

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post #10 of 26 Old 06-11-2008, 02:05 PM
 
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I think I know what you are talking about. Is it the mount under the engine? if it is then yes, it broke. I welded it once, it broke again. welded it for a second time and seems to be staying together this time. (I'm not a great welder)

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post #11 of 26 Old 06-11-2008, 03:34 PM
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Quote:
Originally Posted by ktwmoto20 View Post
I think I know what you are talking about. Is it the mount under the engine? if it is then yes, it broke. I welded it once, it broke again. welded it for a second time and seems to be staying together this time. (I'm not a great welder)

ktwmoto20,

Sounds like you're on the same page w/ us, but here's a pic so you can see what we are talking about (pardon the cruddy pipes--took the pic before cleaning and mounting my bellypan). BTW, did you TIG or MIG weld it?
Attached Images
File Type: jpg FramePipeTab.jpg (508.2 KB, 108 views)

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post #12 of 26 Old 06-11-2008, 04:52 PM
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Sokali knows, but have an 05' with 15,000 and it is still intact. Ran stock until around 8,000 miles, the bafflectomized until around 12,000, and now have Leo Vince Ti's.

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post #13 of 26 Old 06-12-2008, 06:38 PM
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Well, had the day off so I decided to fab up a bracket very much like CB900F2's, installed it on the bike, went for a short test ride and the resonance at 6K and above in top gear appears to be gone. I'll need to go on an extended freeway run before I'll know for sure.

Thanks for posting your idea CB900F2!

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post #14 of 26 Old 06-12-2008, 07:34 PM
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Originally Posted by sugs View Post
I'll need to go on an extended freeway run before I'll know for sure.
GMR awaits!

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post #15 of 26 Old 06-12-2008, 08:22 PM
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mine's been broken for at least 10k miles...broke while the stock setup was still on

could care less about it...

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post #16 of 26 Old 06-12-2008, 08:34 PM
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Mine has not broken yet....I must ride like a wussy
my last buzz issue was the rear seat lock and sliders got a lil loose........

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post #17 of 26 Old 06-12-2008, 09:02 PM
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I probably have the most abused 919 ever made. Mine has never broken anything except for the two times it's been wrecked. I throw that thing up like there's no tomorrow and sometime's she comes down hard. Sure enough, she likes it rough and screams for more... 919 = wheelie good time. Since the 900RR exhaust I've been a little skeptical about doing wheelies since the only thing holding it on is the header flanges to the crankcase, then the bracket on the passenger peg area of the rearset is actually holding the can down from getting scratched. What can I say, she likes being abused.

Oh yeah, one thing did come loose before. Just the little bolt that holds the right side cover, it came off from me doing stoppies all day. I just came out of a store and saw that the sidecover was just barely hanging on. That's it..

2 > 4
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post #18 of 26 Old 06-12-2008, 09:23 PM Thread Starter
 
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Quote:
Originally Posted by hasbeenracer View Post
GMR awaits!
+1

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post #19 of 26 Old 06-12-2008, 09:40 PM
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Interesting, this could explain my terrible 6k resonance. I'm going to the garage to check out that mount.

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post #20 of 26 Old 06-12-2008, 09:44 PM
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Its broken...

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post #21 of 26 Old 06-12-2008, 09:45 PM
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Quote:
Originally Posted by C3N4 View Post
Mine is cracked too--though I haven't noticed any difference in the ride quality. Regardless, I would like to get it fixed sometime in the future.

I wonder if it can be MIG welded or if it requires TIG (generally more expensive)?
MIG or even a clean stick job should be fine. I'd even trust my own skills there.

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post #22 of 26 Old 06-13-2008, 07:18 AM
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Quote:
Originally Posted by hasbeenracer View Post
GMR awaits!
Ha!

Quote:
Originally Posted by ratdog View Post
mine's been broken for at least 10k miles...broke while the stock setup was still on

could care less about it...
I wouldn't have bothered either, but I had the time and doing yardwork didn't seem too interesting...

Quote:
Originally Posted by jeffcycles View Post
Interesting, this could explain my terrible 6k resonance. I'm going to the garage to check out that mount.
This is the only reason I did this, the resonance at 6K. I must say though that it still seems to vibrate the worst in that range, just without the resonance. Again, need to go on an extended run to make sure...to be continued...

'02 Honda 919 - She's the only one for me!

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post #23 of 26 Old 06-13-2008, 09:02 AM
 
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Hey C3N4,

i just used a arc welder. seems to be holding up fine the second time around. If it breaks again I'm going to try to fab up a little bracket to cover the break and weld that to the hanger (both sides of the break). Or just be lazy and let it go... haha

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post #24 of 26 Old 06-15-2008, 12:26 PM
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2000TJ and ktwmoto20,

Thanks for the welding info--I wouldn't do it myself, but it's good to know for when I finally get around to having it fixed. That bracket idea does look like something I could do myself tho.

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post #25 of 26 Old 07-12-2008, 10:26 AM Thread Starter
 
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Followed Rob's advice and removed it before my last track day.

No more resonance.

Don't know if I'll bother welding it though; it'll probably break again.


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post #26 of 26 Old 07-12-2008, 12:38 PM
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I just picked up a new level of vibration this week. Checked my bracket, good as new. I may shore up motor, and break all motor mount bolts loose and re-torque. Then check head tube bearings. I know they're not dry cause I have a zirk fitting there.

[
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