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Discussion Starter #1
Hey guys was really hoping someone here can point me in the right direction with what might be wrong with my bike. It is making several sounds.

1) When riding starting at about 3800 rpms there is a rattling almost jingling sound from the front of the engine and it continues until the exhaust masks all sounds. Does not change with clutch pulled in.

2) Lately has been shifting a little rough and when rolling with clutch pulled in it makes a few deep clunk sounds.

3)This one has made me stop riding it. When im going slow i hear what sounds like some small metal pieces bouncing around the case. Almost sounds like wire brushes wires.

Im thinking i will have to drop the engine and look around at the gears and clutch but if ya'll have another suggestion I would love to hear it.

I was thinking cct for a but i made myself a manual tensioner with a bold and locknut.
Thanks folks
 

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Hey guys was really hoping someone here can point me in the right direction with what might be wrong with my bike. It is making several sounds.

1) When riding starting at about 3800 rpms there is a rattling almost jingling sound from the front of the engine and it continues until the exhaust masks all sounds. Does not change with clutch pulled in.

2) Lately has been shifting a little rough and when rolling with clutch pulled in it makes a few deep clunk sounds.

3)This one has made me stop riding it. When im going slow i hear what sounds like some small metal pieces bouncing around the case. Almost sounds like wire brushes wires.

Im thinking i will have to drop the engine and look around at the gears and clutch but if ya'll have another suggestion I would love to hear it.

I was thinking cct for a but i made myself a manual tensioner with a bold and locknut.
Thanks folks

Check the PAIR reed valves perhaps?
Or the HTEV?
 

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Discussion Starter #6
Im not sure where I managed to find one, The htev moves under the different throttle levels. So I assume its in proper order Ill run it today and put my stethoscope on it and see how it sounds. What are Reed valves?
 

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the reed valves are on top of the valve cover. there are two of them. they are basically one way valves that suck fresh air in from a hose that goes to the air box to lesson exhaust emissions.

its not super common they go bad but not unheard of either. lots of people just remove them all together with a set of block off plates you can get to put on the valve cover after you remove the reed valves. it wont do much in the way of adding any performance but does clean things up and cuts a bit of weight off. nothing major but guys that race particularly are always looking for a simplified way to break down a motor and shave weight from their machines.

take a listen and try to pinpoint where your noise is. you can get a long screw driver and place the tip on different parts of the block with the handle end pressed against your ear. move it around until you get to where its the loudest.

i understand that might be difficult to do while trying to hold the throttle at a certain rpms but not impossible. that wont tell you for sure the problem but it will be easy to determine if its coming from the transmission or the bottom end or the top end of the block.

the reed valves kinda make a buzzing raspy kinda sound that i guess might be described as a wire brush kinda sound? anyway see if you can find out a little more where its coming from n get back to us.

a clip of the sound would really help the guys have a better idea of what kinda sound were talking about. i know thats a pain in rear but will go a long way in helping these guys help you if at all possible.
 
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let us know if it does or doesnt work for you. its frustrating for me personally when someone either does or doesnt get the problem fixed and doesnt post the solution or follow up with the process. there are probably people who have the same trouble and search the web and come here looking for a solution or at the very least can see what you did that didnt work and hopefully why. so you could really be helping the next guy with your problem. :)

i was out on a ride today and kinda noticed a sound around 3800 on my 954 that kinda sounded a bit like what your describing. but id say mine sounded more like the license plate rattle on a car with shove(nice subs). it wasnt as much of a metal sound but more of a plastic vibration kinda sound that i usually only hear under moderate acceleration right around those rpm's then it goes away. not sure if it just doesnt make that sound when im under full throttle and just cant hear it then? it honestly doesnt bother me but it sounds like its coming from the front portion of the bike but i couldnt say where. i didnt try and reproduce it while standing still in neutral or with the clutch pulled. ill try n remember to see if it does and maybe see if i can figure out what it is exactly. like i said tho mine sounds more like the plastics rattling on something just as the engine vibrations hit a certain frequency but ill report back, just wondered if what your hearing might be the same thing?
 

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let me ask you this @msebastianCBR, when doing the pair reed mod do you have to pull the valve cover to get the reeds out? i know the block off plates cover the holes but dont the reeds actually stick up a little so they hafta come out to get the plates on right? just didnt know if they went in thru the top or were mounted from the bottom of the valve cover...
 

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let me ask you this @msebastianCBR, when doing the pair reed mod do you have to pull the valve cover to get the reeds out? i know the block off plates cover the holes but dont the reeds actually stick up a little so they hafta come out to get the plates on right? just didnt know if they went in thru the top or were mounted from the bottom of the valve cover...

Nope, the reeds are directly under the PAIR port covers, they actually act as the gaskets so removing them will require making new gaskets or using a sealant.
These are mine.
http://www.fireblades.org/forums/honda-fireblade/71327-secondary-intake-block-off.html#post751646
 

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Discussion Starter #14
Put my block off plates on today, havent started it up yet but found three small hoses T'ed together but attached to nothing any ideas what they are? One of the hoses was mounted on a clip on the right side of the bike frame near the gas tank.
 

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Breather hose. The two ends should be connected to nothing but the one by itself should go to the tank I believe... Not very important but yeah thats where it goes if I'm remembering correctly.
 

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let us/me know if that sound goes away. im pretty sure we have the same sound n now im curious wtf it is! it comes and goes as fast as it came on mine usually right around 3800 n soon as it gains another 75-100 rpm it goes away. sometimes its will do it at slightly lower rpm's and then vanish as well. so i want to know if the block off plates get rid of it. like i said tho it sounds like plastic vibrating on mine to me?
 

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Discussion Starter #18
IT did not go away, I did the following changes while bike was apart.
1)block off plates for reed valves
2) disconnect htev and set for midrange power
3) Turned the fuel line on the gas tank 180 because from the tank it was pointing towards the coolant reservoir side and the port for the other end of the fuel line is on the right side of the bike.


Changes: From startup it ran better even after sitting unran for a week which usually makes it a little rougher on startup. The exhaust does sound better and maybe more responsive.

Conclusion: Still have the rattles and the jingles. I think Im going to ride it until something catastrophically fails on it and then fix it. Until then I will assume its something hitting the frame or jostling about on the plastics.
 
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