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Author Topic: Check this drilled rotor pattern  (Read 2524 times)

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Offline Duanob

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Check this drilled rotor pattern
« on: February 21, 2013, 09:05:53 AM »
Thinking of buying this disc for my 76 CB550K but is this pattern OK? It looks like the outside holes are pretty close to the edge, is this a problem?
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"Just because you flush a boatload of money down the toilet, doesn't make the toilet worth more",  My Stepfather the Unknown Poet

1974 CB360T
1976 CB550K2 Resurrected
1976 CB550F2 Barn Find
1979 CX500 VG "HONDA-GUZZI"
2007 Moto Guzzi Breva 750ie
2015 BMW F700GS
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Offline flybox1

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Re: Check this drilled rotor pattern
« Reply #1 on: February 21, 2013, 09:38:45 AM »
Hey Duane, check these.
http://www.vinmoto.org/gallery/v/VinMoto-Garage/album03/Godfferys-Garage-123/album185/Brake+Rotors+_+Thinned+and+Drilled/HONDA+Front+brake+rotors+CB+450K-500T-500K-550K-550F/

he also has phenolic pads and anti-squeal discs for behind the slave pad if you have a squealer  ;D
« Last Edit: February 21, 2013, 09:47:08 AM by flybox1 »
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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline Duanob

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Re: Check this drilled rotor pattern
« Reply #2 on: February 21, 2013, 11:39:01 AM »
Yes I have a squealer alright.

I wonder about thinning the rotor down by 2mm will it warp easier? Will it effect the run out on the brake piston? 2mm is a lot when taking brake clearances. Just curious.
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"Just because you flush a boatload of money down the toilet, doesn't make the toilet worth more",  My Stepfather the Unknown Poet

1974 CB360T
1976 CB550K2 Resurrected
1976 CB550F2 Barn Find
1979 CX500 VG "HONDA-GUZZI"
2007 Moto Guzzi Breva 750ie
2015 BMW F700GS
Another 1976 CB550K Cafe?

  __o
_- \_<,
(*) /' (*)

Offline flybox1

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Re: Check this drilled rotor pattern
« Reply #3 on: February 21, 2013, 11:52:08 AM »
no, its thinned to 4mm. 
pad runout, maybe, but it wouldnt be for at least one season unless youre in the city  :P
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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline Big Bob

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Re: Check this drilled rotor pattern
« Reply #4 on: February 21, 2013, 12:08:13 PM »
We've been running the drilled & thinned Godfrey rotors on a number of CB750 and CB400F race bikes for the last few years. 

We've had zero issues with them after subjecting them to abuse that a street bike will never see.

They're worth every penny and then some.
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Offline flybox1

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Re: Check this drilled rotor pattern
« Reply #5 on: February 21, 2013, 12:17:38 PM »
Good to hear from another satisfied user, Big Bob.
Not 20 minutes ago I got the email from Godffery that my two 750 rotors are done  ;D   8)

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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline Duanob

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Re: Check this drilled rotor pattern
« Reply #6 on: February 21, 2013, 03:16:44 PM »
Thanks for the info.

Bigbod any brake squeal issues?
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"Just because you flush a boatload of money down the toilet, doesn't make the toilet worth more",  My Stepfather the Unknown Poet

1974 CB360T
1976 CB550K2 Resurrected
1976 CB550F2 Barn Find
1979 CX500 VG "HONDA-GUZZI"
2007 Moto Guzzi Breva 750ie
2015 BMW F700GS
Another 1976 CB550K Cafe?

  __o
_- \_<,
(*) /' (*)

Offline cameron

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Re: Check this drilled rotor pattern
« Reply #7 on: February 21, 2013, 03:58:13 PM »
i want.
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1976 CB550F

Offline laminaytrap

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Re: Check this drilled rotor pattern
« Reply #8 on: February 22, 2013, 06:36:10 AM »
NBD on the holes, we used to run all kinds of patterns on our race cars, including ones with edge holes (not a great idea from an engineering standpoint, but they worked fine)

Truth is there's a lot of thickness and area in that rotor for the amount of braking you can do with stock design.
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Offline Tews19

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Re: Check this drilled rotor pattern
« Reply #9 on: February 22, 2013, 07:15:53 AM »
I have bought several from godffrey as well. Super light, function great and I have not experienced any warpin yet.
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1969 Honda CB750... Basket case
1970 Honda CB750 survivor.

Offline Big Bob

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Re: Check this drilled rotor pattern
« Reply #10 on: February 25, 2013, 05:15:26 AM »
Quote from: Duanob on February 21, 2013, 03:16:44 PM
Bigbod any brake squeal issues?

None whatsoever.  Clean out the caliper and make sure the pads move freely and they're quiet as can be.  I am not of the opinion that the common SOHC front brake squeal has anything to do with the rotors.

This stuff works great:

http://www.international-auto.com/lubricants/wurth-silicone-lubricating-compound-lube-gel.cfm
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Offline Big Bob

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Re: Check this drilled rotor pattern
« Reply #11 on: February 25, 2013, 05:20:18 AM »
Quote from: flybox1 on February 21, 2013, 12:17:38 PM
Good to hear from another satisfied user, Big Bob.

Full disclosure:  Jeff is a friend of mine.  Was just out riding with him yesterday.

That said -  if his stuff didn't work I would without hesitation say it didn't work.  He has seen me do stuff like this in person, occasionally with great vigor, at high volume, accompanied with illustrative hand gestures and creative profanity.
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Offline flybox1

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Re: Check this drilled rotor pattern
« Reply #12 on: February 25, 2013, 05:33:21 PM »
Gifts from Godffery came today  8)
These are the bees knees!
« Last Edit: February 25, 2013, 05:46:27 PM by flybox1 »
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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline brandEn

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Re: Check this drilled rotor pattern
« Reply #13 on: February 25, 2013, 05:54:29 PM »
Those look great! Does he paint them too?
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Offline flybox1

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Re: Check this drilled rotor pattern / Godfferys rotors
« Reply #14 on: February 25, 2013, 06:10:41 PM »
They look blasted, and waxed. 
« Last Edit: February 26, 2013, 08:28:28 AM by flybox1 »
Logged
'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"
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