Honda Motorcycles - FireBlades.org - Reply to Topic
Honda FireBlade Discussion of the Honda CBR 900RR, Honda CBR 929RR, Honda CBR 954RR, and Honda CBR 1000RR Motorcycles.

Thread: 929 flapper noise Reply to Thread
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  Topic Review (Newest First)
07-23-2013 12:25 PM
Lobsta13
Re: 929 flapper noise

Thanks BR!
07-23-2013 11:42 AM
bladeracer
Re: 929 flapper noise

Quote:
Originally Posted by Lobsta13 View Post
Also, look into compatibility with the 954. The headers may be the same.

The entire exhaust system is the same for the 929 and 954, the only difference is the mounting point of the muffler hanger. Using a muffler on one that has been on the other will leave a mark around the can due to the different placement of the hanger strap.
The OEM 929 muffler has a fixed muffler mount so it does not fit onto a 954 without modification.
07-23-2013 11:38 AM
Lobsta13
Re: 929 flapper noise

Also, look into compatibility with the 954. The headers may be the same.
07-23-2013 11:36 AM
Lobsta13
Re: 929 flapper noise

I don't know that there's that much weight saving on the front part of the headers and there's no electrical stuff in there at all, just the mechanical HTEV. The only electronic thing is the servo pulling the cables to the flapper and the HTEV.
If you can't find a full exhaust, you can get about the same benefits of a full system by doing the removal of the HTEV and a remap with a slip on.
07-23-2013 10:00 AM
eagle_lex
Re: 929 flapper noise

well so i can get rid of that heavy ass factory system for one... and for two.. i have no doubt that all that electronical **** in that exhaust will probably one day give me fits. maybe im old school but i just always put full exhausts with either a custom map or a fuel system programmer (ie power commmander) on my bikes. maybe im being dumb... idk. but im very upset that i cant find ANYTHING for this bike exhaust wise.... you would think there would be something nice out there. damn... what are all you guys doing with your older cbrs? already have an exhaust i guess. there just isnt much out there option wise...
07-23-2013 9:47 AM
Lobsta13
Re: 929 flapper noise

Quote:
Originally Posted by eagle_lex View Post
ok guys... i chaged my air filter this weekend and here is the report. to answer "Jud's" question, i didnt do anything to the bike. when i got the bike from my dad it made the vibrations and flapper noise. a month later... the noise is gone. no idea why.

ok the flapper valve IS working. it opens up at 8k rpms with no load required. so it seems to be fine. replaced the old air filter with the new one and put it all back together. all seems to be fine. NOW if ONLY i could find a new full exhaust for it.
What did you want a full system for? (vs just a slip on)
07-23-2013 7:42 AM
eagle_lex
Re: 929 flapper noise

ok guys... i chaged my air filter this weekend and here is the report. to answer "Jud's" question, i didnt do anything to the bike. when i got the bike from my dad it made the vibrations and flapper noise. a month later... the noise is gone. no idea why.

ok the flapper valve IS working. it opens up at 8k rpms with no load required. so it seems to be fine. replaced the old air filter with the new one and put it all back together. all seems to be fine. NOW if ONLY i could find a new full exhaust for it.
07-20-2013 3:15 AM
jud
Re: 929 flapper noise

Hi.. I have the same vibes. Was there anything else you did just before the vibes disappeared?
Even a minor thing may have sorted it?
Cheers
07-18-2013 12:06 PM
RRDemon
Re: 929 flapper noise

Quote:
Originally Posted by Lobsta13 View Post
It won't hurt to pull it out or pin it open. A lot depends on if the servo is stripped. If you have to pull it, it's not a tough job. It really doesn't do a whole lot and I doubt you would notice one way or another (I didn't). Truthfully, if the noise is gone, and you're not getting a code and the bike is running strong, I would probably leave it.
07-18-2013 12:06 PM
eagle_lex
Re: 929 flapper noise

thanks a ton. i just hope its not locked in a semi open position as i guess that would effect top end by not getting enough air. total guess there. not even sure if it can lock in any position if the servo is stripped or burnt. but like i said... no codes and seems to run fine.
07-18-2013 11:57 AM
Lobsta13
Re: 929 flapper noise

Quote:
Originally Posted by eagle_lex View Post
IF its not working... with your experience would you just pull the flapper out? what issues would i have considering the bike is stock with juut a two brothers slip on? sorry for the dumb questions... my last bike was a gsxr 750 with none of this stuff on it. i TRUELY appreicate everyones advice and help!!!! more than you know.
It won't hurt to pull it out or pin it open. A lot depends on if the servo is stripped. If you have to pull it, it's not a tough job. It really doesn't do a whole lot and I doubt you would notice one way or another (I didn't). Truthfully, if the noise is gone, and you're not getting a code and the bike is running strong, I would probably leave it.
07-18-2013 11:53 AM
eagle_lex
Re: 929 flapper noise

IF its not working... with your experience would you just pull the flapper out? what issues would i have considering the bike is stock with juut a two brothers slip on? sorry for the dumb questions... my last bike was a gsxr 750 with none of this stuff on it. i TRUELY appreicate everyones advice and help!!!! more than you know.
07-18-2013 11:27 AM
Lobsta13
Re: 929 flapper noise

Quote:
Originally Posted by eagle_lex View Post
lobsta13- THANK YOU! i was under the impression that it only worked under "load" so just reving the motor would not move the flapper.... i guess im wrong?? here is what we are doing this weekend. im picking up a new air filter (dont flame me... it has NEVER been changed!!! i about fell down when i heard this.)

so we just need to take the dampener off and pull the tank to get to the airbox, pull the old filter and then i guess i can take a look at the flapper and see if your method does anything.
anything im missing?
It will move, though I may be wrong at what RPM it opens (thanks Sky). I thought it was more specific to how wide open the throttle was, so I really wasn't paying any attention RPMs . I can tell you that it does not have to be under load.
You shouldn't have to pull the tank completely off, it is hinged and you should be able to get to all the screws to pull the airbox cover, though the back ones are a bit tough to get to with the tank on. There's only a couple of screws keeping the tank closed and if you have a yoke damper, you will have to remove it, plus two screws holding the ram air ducts on each side of the tank.
I pulled the flapper out of my 954 when the servo stripped the gears and became pretty familiar with opening up the airbox and the HTEV system. It's not hard to do but opening the airbox gets old pretty quick.
07-18-2013 10:58 AM
eagle_lex
Re: 929 flapper noise

lobsta13- THANK YOU! i was under the impression that it only worked under "load" so just reving the motor would not move the flapper.... i guess im wrong?? here is what we are doing this weekend. im picking up a new air filter (dont flame me... it has NEVER been changed!!! i about fell down when i heard this.)

so we just need to take the dampener off and pull the tank to get to the airbox, pull the old filter and then i guess i can take a look at the flapper and see if your method does anything.

anything im missing?
07-18-2013 10:57 AM
Sky91
Re: 929 flapper noise

Quote:
Originally Posted by Lobsta13 View Post
It only activates when you hit the throttle, but you should see it move above 3k rpm. An easy check and could help point you in the right direction or at least eliminate things.
It's open at 8k, not 3
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