I would start with the most obvious first, the rotors.

 

yeah.. i got a similar problem i think... but ive been calling around to find a machine shop and no one will do it anymore for liability reasons... guess ill have to find a friend with a mill or something...

 

you can't turn rotors. google wills rim repair he can straighten them for 15 bucks

 

Yeah I found out you don't resurface bike rotor's... Wait rim repair?

 

hey genosr1, thanks for the tip. illl have to get in touch with him. howd you hear about him?

 

oh.. and i saw your post about having your gsxr rotor fixed... im assuming thats still holding out?... and whats the runout limit? i still need to measure mine when i get them off my bike. thanks!

 

Does anyone not have a clue as to what's going on with my fork?

 

check your steering stem bearings...may be loose. The guy that said check your fork oil should be slapped!!!

 

+1 .....10

 

If your talking about a slight growling or vibration, a lot of 07+ 600rr's do that. I know mine did, since it was brand new.

Edit: if it pulsates at 70+ mph then its a different issue. The common problem was mainly at very low speeds, under 30 mph.

 

My bike does that at low speeds when I break it feels like it rumbles but the breaks still work and my bike is an 08.

 

#1. Have your suspension setup for your weight #2. How are you braking? Because a hard fast graby pull on the front brake can cause it during a quick stop! (which could be related to #1,) #3. Do you us the back brake? Because hard back braking with hard fast graby front braking can cause it as well?

Anyways, three possilbe causes, two of which can be rider error....

 

#1. Have your suspension setup for your weight #2. How are you braking? Because a hard fast graby pull on the front brake can cause it during a quick stop! (which could be related to #1,) #3. Do you us the back brake? Because hard back braking with hard fast graby front braking can cause it as well?

Anyways, three possilbe causes, two of which can be rider error....

Well I haven't really noticed the problem until recently but I bought this bike used awhile ago and supposedly the guy had the suspension setup for his weight which was the same as mine. Umm I don't think I'm grabbing the lever too hard and yes I always use the front/rear brake together when coming to a stop.

Oh yeah and Evan it's mainly at lower speeds, cause when I'm coming to a stop or braking from highways I don't seem to have that problem.

 

I have an 07 and I can feel the pulsating of the front when I apply moderate to hard braking pressure. I thought it could be my pads but I bought the bike with only 2K miles on it.

 

My 08 does the same thing.

 

First and most obvious would be the rotors. Will's Rim Repair also straightens rotors, and quite cheaply I might add. He's straightened a couple sets of rotors and wheels for me over the years, does a great job.

 

First and most obvious would be the rotors. Will's Rim Repair also straightens rotors, and quite cheaply I might add. He's straightened a couple sets of rotors and wheels for me over the years, does a great job.

Yeah so I talked to a service writer at a local dealer and he told me the exact same thing. Told me that I probably have a bent rotor and that it isn't the steering stem bearing?

 

If you're experiencing the pulsing under straight up and down riding, and its very regular, its probably not the steering stem nut. It's really not likely that its the steering stem bearing, you would only feel this if it was clunking when you turned the bars.

Its more likely the rotors. It's very easy to tweak a rotor, they are pretty big in diameter and any amount of pressure laterally can put just the slightest bit of bend in them. Usually happens when someone accidentally runs the front end of their bike into the car or garage wall as they are trying to park it. I've also seen guys using cheap wheel chocks park the bike on the side stand with the front wheel in the chock so they can grab their tie downs. Front wheel will get twisted in the chock and rotor rubs the chock causing the bend.

Last time I had Will straighten a set for me he charged like $50 + shipping.

 

The only other possibility I'd consider would be that your front wheel is out of balance. This isn't likely either though, because you would feel this vibration at speed, regardless of whether or not you were braking.

 

The only other possibility I'd consider would be that your front wheel is out of balance. This isn't likely either though, because you would feel this vibration at speed, regardless of whether or not you were braking.

Yeah I don't think he's a balancing issue so with what you're saying I'm almost sure it's the rotor then. Damn rotor's are expensive or maybe I'll ask the shop I'm going to today and I'll ask if they can straighten them out.

 

Okay so I took my bike to a shop today to get my front and rear tires mounted/balanced. The tech took my bike out and told me the reason why I had vibration/pulsating issues was because my rotor's were mounted in the wrong direction. Sooo in the end it was because my rotor's weren't in the rignt direction, hahaha.:tard:

 

i had the exact same problem...rotors were in reverse direction and really had a pulsating effect...

when i put them back on correctly, the pulse dramatically lessened but still has a bit whenever i brake at idle speed.

might have a slight warp on my rotors.

 

so you no longer have a pulsation?

 

Hey what's up Murph! Yeah man the pulsation is completely gone now... It's funny too cause I was so sure it was the steering stem bearing like everyone has been saying, even a good friend told me that's what it was. A few other shop's I called during the week told me it was a bent rotor but the tech told me today that all that was BS cause it was caused by my rotor's being in the wrong direction. He said he couldn't explain exactly why it does that from a simple rotor going the wrong direction while braking but said it's a common problem that he see's often.

 

has anyone tried having the rotor drilling countersunk? my 08 does the same thing and the head bearing is within specs, according to the dealer. maybe the reversing of the rotors on an older bike makes it better because the brake pad hones the rough flashing caused by drilling in production? my rotors feel sharp as hell to the touch on the drilled holes. i am a builder and often fabricate things and it seems to me pulling the rotors and having them slightly countersunk by a machine shop could be our answer. i am not certain if it would mess with the tempering or cause a weakness in the rotor, however. any machinists have input? thanks!

 

I've seen the countersink done on car rotors.

It doesn't seem like it would be as good to me.

I like the sharp cutting edges and the way the bike rotors are made.

.....that's awesome if flipping the rotors solves the problem.

Are there directional indicators or markings on them, and are you swapping them from one side to the other?

 

yea, mine has done the same thing from the day i bought it, i wonder if the dealer screwed it up...either way, another thing i did to minimize this was make sure i don't have any weight on the bars when i'm braking, i haven't noticed it too much since i concentrate on keeping my weight in my legs under braking...

 

If you're talking about the occasional "growl" pulse coming to a stop from under 5-7 mph, yeah they all do it.

 

Can anyone take a pic of their rotors showing either the correct orientation or the wrong please so fellow members can compare???

Thanks.

 

+1, having this issue on my 05

Sent from my ADR6300 using Motorcycle.com Free App

 

My 2010 has done it from new ,only at slow speed under medium and light braking . not many times, 3 or 4 i think . Not a problem ,more of an anoyance really as it makes me stop looking at were i am going and look at the front of my bike instead.

 

There are arrows on them showing the direction of travel.