Why is the lower fairing bolt shaped like this? - Honda CBR250R Forum : Honda CBR 250 Forums
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Old 11-10-2012, 07:08 PM   #1
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Default Why is the lower fairing bolt shaped like this?

Hi all,

Why does the lower side faring bolt have a lip on it? It prevents contact with the fairing/bracket as the lip goes hard up to the fairing and so does not contact the bracket when done up tight. Thus, it allows 2 mm of movement in the fairing. It does not have a rubber washer to soak up this slop - and so I get the "5k rattle" - which is pretty obviously in my case this fairing vibrating, as the rattle comes from the lower right side, and the right is "looser" than the left.

None of the other fairing bolts have this lip near the head of the bolt.

Dave

Fairing bolt.jpg
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Old 11-10-2012, 07:29 PM   #2
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Originally Posted by CBR_Dave View Post
Hi all,

Why does the lower side faring bolt have a lip on it? It prevents contact with the fairing/bracket as the lip goes hard up to the fairing and so does not contact the bracket when done up tight. Thus, it allows 2 mm of movement in the fairing. It does not have a rubber washer to soak up this slop - and so I get the "5k rattle" - which is pretty obviously in my case this fairing vibrating, as the rattle comes from the lower right side, and the right is "looser" than the left.

None of the other fairing bolts have this lip near the head of the bolt.

Dave
That screw is used only where the front turn signal bracket mounts to the upper cowl. There are two of these screws. It is ref# 11 in this parts diagram:
Honda Motorcycle Parts 2012 CBR250R 3AC TURN SIGNAL Diagram

In this diagram it is shown in the outlined box as F35, which references the turn signal parts listing:
Honda Motorcycle Parts 2012 CBR250R 3AC UPPER COWL Diagram

Whoever worked on your bike last must have mixed that screw up with one of the screws that do not have the flange. Having that screw used at any location other than on the turn signal bracket would certainly explain a loose and rattling cowl.
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Old 11-10-2012, 07:43 PM   #3
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That screw is used only where the front turn signal bracket mounts to the upper cowl. There are two of these screws. It is ref# 11 in this parts diagram:
Honda Motorcycle Parts 2012 CBR250R 3AC TURN SIGNAL Diagram

In this diagram it is shown in the outlined box as F35, which references the turn signal parts listing:
Honda Motorcycle Parts 2012 CBR250R 3AC UPPER COWL Diagram

Whoever worked on your bike last must have mixed that screw up with one of the screws that do not have the flange. Having that screw used at any location other than on the turn signal bracket would certainly explain a loose and rattling cowl.
Cheers!

It is on the lowest bracket, and the same both sides. I am the last person to mess with the fairings...but Im 99% sure I put everything back where it came from (I laid it all out carefully). I noticed that two bolts of the six were different at the time. I had the first service done before I messed with the fairings (a stone got in there and was making a racket!). Perhaps they may have replaced them incorrectly though...in any case, I'll swap them back!

I actually now recall a thread where someone else reported the same question about the looseness and the shape of this bolt...so maybe some were out of the factory like this?

Dave
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Old 11-10-2012, 08:33 PM   #4
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...so maybe some were out of the factory like this?
Just about anything is possible... I'd think that it's more likely that a dealership technician doing the Valve Clearance Inspection may have reinstalled them in the wrong location by mistake. If something like this were to occur at the factory during production, I'd think that a lot more owners would notice their lower cowls loose.

Cheers,

Mike
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Old 11-10-2012, 09:53 PM   #5
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Just about anything is possible... I'd think that it's more likely that a dealership technician doing the Valve Clearance Inspection may have reinstalled them in the wrong location by mistake. If something like this were to occur at the factory during production, I'd think that a lot more owners would notice their lower cowls loose.

Cheers,

Mike
Yeah, true. It's just that its always had this deep popping vibe at 5-5.5k "just on the throttle" coming from the lower front of the bike...I just put it down to vibes coming from a single thumper (and anyway I'm a noob, and expected a few vibes from a machine where my arse is 4" from the engine hehe). Still, I'm not fussed either way. Wasn't doing any harm, and easily determined by inspection :-)

Can't wait to take her out and see if my 60 seconds work with an Allen key did the trick. Clearly a better fit with the right bolts in the right places .

I'm gunna check my mates bike: bought from the same dealer and serviced same day as mine.

Thanks again,

Dave
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Old 11-10-2012, 11:29 PM   #6
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Default Stepped Screws

Actually, there are 4 of those stepped screws, 2 at the very front of the fairing and 2 at the very rear of the side panel, right under the riders seat.
I just did a quick check of the valves yesterday, so it's fresh in my mind.

I have about 8,800 miles on mine and wanted to see how the exhaust valve clearance was holding up, no worry, they had only lost about .001". The intakes were still right on .007", just as they were at 600 miles, and both exhausts are now at .009", still plenty good. I also checked the thickness of the shims on the exhaust valves, since I had it apart, that way I'll pick up a couple of thinner shims, so the bike won't be tied up while I go to town for shims, I live about 75 miles from the dealer. Both exhaust shims were .078" thick, so I'll pick up the next 2 sizes thinner.

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Old 11-11-2012, 12:23 AM   #7
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Actually, there are 4 of those stepped screws, 2 at the very front of the fairing and 2 at the very rear of the side panel, right under the riders seat.
I just did a quick check of the valves yesterday, so it's fresh in my mind.

I have about 8,800 miles on mine and wanted to see how the exhaust valve clearance was holding up, no worry, they had only lost about .001". The intakes were still right on .007", just as they were at 600 miles, and both exhausts are now at .009", still plenty good. I also checked the thickness of the shims on the exhaust valves, since I had it apart, that way I'll pick up a couple of thinner shims, so the bike won't be tied up while I go to town for shims, I live about 75 miles from the dealer. Both exhaust shims were .078" thick, so I'll pick up the next 2 sizes thinner.
Sorry, I should have been more clear: I meant the front side fairings that have 6 of these bolts, three each side :-)

Dave
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