Advice - 919 Rear Rotor - Wrist Twisters
 
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post #1 of 21 Old 05-11-2010, 05:40 PM Thread Starter
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Advice - 919 Rear Rotor

So, I told a story a while back about my 06 919. Bought it used and the previous owner had done a bunch of sh-t to the tail. Basically he installed a 599 hornet fender eliminator and as a result the FI module and other electronics / switches were floating around in the back of the bike. Anyways, I found the stock tail on ebay for 30 bucks and brought it in to get installed.

Before bringing it in, noticed a noise coming from the rear wheel, a sort of metal on metal grind. Figuring it was the brakes, I wasn't surprised to hear I need a new rotor / pads.

Does this sound about right?

Also, what do you think about an EBC rotor vs. OEM? The shop plans on ordering EBC for 159 (I found the OEM for 176 online).

I trust the shop. Just wanted a second opinion.

Cheers!

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post #2 of 21 Old 05-11-2010, 06:08 PM
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I like the galfer wave rotor, I saw one on eBay for $125+ shipping.

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post #3 of 21 Old 05-11-2010, 06:59 PM
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+1 on the Galfer wave rotors. Check 'em out..

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post #4 of 21 Old 05-11-2010, 08:15 PM
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If the rear pads wear down too far and you get the metal backplate grinding into the rotor that would kill it pretty quickly, I don't think theres any way to re-surface bike rotors.

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post #5 of 21 Old 05-11-2010, 08:29 PM
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First, does it really need a rear rotor? It would have to be obviously torn up or overheated to warrant replacement.

Second, you can probably pick up a complete rear wheel used, with rotor for $176. Sounds really high.

Finally, I bet somebody here has upgraded rotors and has a stocker they would sell really cheap.

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post #6 of 21 Old 05-11-2010, 09:22 PM
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You can always get a used rotor cheaper, but you rolls the dice and you takes your chances that it will be in usable condition. Here's one on ebay:

02-07 Honda CB900F 919 Rear Disc Brake Rotor OEM : eBay Motors (item 390168061776 end time Jun-08-10 09:40:12 PDT)

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post #7 of 21 Old 05-11-2010, 10:01 PM
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These are wise suggestions ! I'd be listening. Especially considering how much the rear brake is typically used.

Quote:
Originally Posted by catonsvilleguy View Post
First, does it really need a rear rotor? It would have to be obviously torn up or overheated to warrant replacement.

Second, you can probably pick up a complete rear wheel used, with rotor for $176. Sounds really high.

Finally, I bet somebody here has upgraded rotors and has a stocker they would sell really cheap.

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post #8 of 21 Old 05-11-2010, 10:09 PM
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How many miles are on your bike? I can't believe that someone wore the pads out that quickly enless they rode the rear brake all the time. My rear pads lasted an average of about 35K miles. I think I need one as well. Lately it feels like mine is warped. I don't know if I will go with OEM or galfer. Which ever is cheaper.

Spoiler:

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post #9 of 21 Old 05-12-2010, 05:12 AM
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Minimum thickness, on my OEM rotor, was listed as 4mm. Mine got all scored from a shitty rear bearing, some spots were around 3.5mm.

Ended up being about $230 from a local shop for a new Honda rotor -- way to support the local guy! Pads were cheap, maybe $25?

Real easy to replace and I'm no mechanic. Remove wheel, heat up wheel near rotor bolts (they use red locktite) then take out bolts. Clean wheel mating surface, align new rotor, locktite bolts and torque them in.

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post #10 of 21 Old 05-12-2010, 09:59 AM Thread Starter
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Thanks for all of your advise.

I don't have a stand and am not experienced enough at wrenching the bike to take the wheel off yet (and feel comfortable with the chain tension afterwards). It is a stretch right now for my wife to accept the fact that I even own such a powerful machine! so I just let the guy order it and am having the shop install it Thurs. It will end up being about $280 bucks after everything.

The rotor is truly trashed, btw. I only have 14k miles on the bike but it is blatently worn and has scars on it. The previous owner must have been on the back brake ALOT. I will upload a picture in the next few hours.

Thanks again folks. Love how active this place is.

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post #11 of 21 Old 05-12-2010, 10:02 AM
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Quote:
Originally Posted by catonsvilleguy View Post
First, does it really need a rear rotor? It would have to be obviously torn up or overheated to warrant replacement.

Second, you can probably pick up a complete rear wheel used, with rotor for $176. Sounds really high.

Finally, I bet somebody here has upgraded rotors and has a stocker they would sell really cheap.

That is a good post through & through.



PS using a Galfer rear rotor on the rear would be ok as the rear brake is generally not used that much on these bikes, but I would never install a set of those Galfer Waves on the front of any bike I own and I try to sway my customers away from it as well due to way too many problems with warping etc...

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post #12 of 21 Old 05-12-2010, 01:30 PM Thread Starter
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bad
Attached Images
File Type: jpg rotor.jpg (111.3 KB, 35 views)

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post #13 of 21 Old 05-12-2010, 01:35 PM
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Ouch...

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post #14 of 21 Old 05-12-2010, 02:40 PM
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cuck it up in a lathe or mill and flatten it out... im sure a machine shop would do it for pretty cheap.

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post #15 of 21 Old 05-12-2010, 03:01 PM
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Quote:
Originally Posted by nd4spdbh View Post
cuck it up in a lathe or mill and flatten it out... im sure a machine shop would do it for pretty cheap.
make sure you can find a minimum thickness spec before you do that.

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post #16 of 21 Old 05-12-2010, 03:08 PM
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Quote:
Originally Posted by Lord Duckhunter View Post
............... but I would never install a set of those Galfer Waves on the front of any bike I own and I try to sway my customers away from it as well due to way too many problems with warping etc...
Ok then. Say a person was pondering a new set of front rotors. What, OEM?

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post #17 of 21 Old 05-12-2010, 03:13 PM
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Quote:
Originally Posted by nd4spdbh View Post
cuck it up in a lathe or mill and flatten it out... im sure a machine shop would do it for pretty cheap.
Quote:
Originally Posted by speedprotege View Post
make sure you can find a minimum thickness spec before you do that.
Uh, I wouldn't say it's worth trying to machine that. The only way I'd touch it is with a double-disk grinder. WAY more hassle than it's worth IMHO.

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post #18 of 21 Old 05-12-2010, 04:01 PM Thread Starter
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Quote:
Originally Posted by semi_gray View Post
Uh, I wouldn't say it's worth trying to machine that. The only way I'd touch it is with a double-disk grinder. WAY more hassle than it's worth IMHO.
Yah. I've installed frame sliders and turn signals.... I'm not confident enough to screw with my braking system yet... let alone, grind down a trashed rotor for re-use.

I've barely put any money into the bike so far so I'm happy to get this squared away by a pro / use new parts.

Also, I live in san fran where the back brake comes in handy going down these ridiculous hills. Going to pay close attention to the pads wearing down in the future.

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post #19 of 21 Old 05-12-2010, 05:08 PM
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Quote:
Originally Posted by rickard919 View Post
How many miles are on your bike? I can't believe that someone wore the pads out that quickly enless they rode the rear brake all the time. My rear pads lasted an average of about 35K miles. I think I need one as well. Lately it feels like mine is warped. I don't know if I will go with OEM or galfer. Which ever is cheaper.
say what? I got 17k outta mine. could've got more but they were toast.

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post #20 of 21 Old 05-12-2010, 06:39 PM
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Quote:
Originally Posted by brian View Post
say what? I got 17k outta mine. could've got more but they were toast.
Mine are mostly highway miles as you can see by the map of states I've had my bike to. Even still, I use my rear brake a lot. I've changed both front and rear pads twice each. I now can feel a little lip on the outside edge of my rear rotor. I haven't measured it yet but am guessing it is close to minimal thickness.

Spoiler:

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post #21 of 21 Old 05-12-2010, 08:15 PM Thread Starter
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Quote:
Originally Posted by brian View Post
say what? I got 17k outta mine. could've got more but they were toast.
15k on mine

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