Front rotors 1987 GL1200 Aspencade


Information and questions on GL1200 Goldwings (1984-1987)
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bikertucker
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Motorcycle: 1987 GL1200A Aspencade

Front rotors 1987 GL1200 Aspencade

Postby bikertucker » Wed Nov 25, 2015 1:59 pm



Hello all, have not posted to the site in a few years. New bike new question. Now have 1987 GL1200 Aspencade has vented front
rotors. Can feel pulsing on front brake lever so I know left front rotor is warped. Ordered from E-bay a different pair of disks.
Question is how can I tell which is the left, and which is the right rotor? Per Honda they are different part numbers. Part
number 14 and 17. Thanks!!


Tim



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WingAdmin
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Re: Front rotors 1987 GL1200 Aspencade

Postby WingAdmin » Wed Nov 25, 2015 2:17 pm

Are the rotors you ordered OEM, or aftermarket? If aftermarket, who is the manufacturer?

bikertucker
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Motorcycle: 1987 GL1200A Aspencade

Re: Front rotors 1987 GL1200 Aspencade

Postby bikertucker » Wed Nov 25, 2015 2:21 pm

The ones on my bike are OEM, the ones I bought on e-bay are OEM.

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MikeB
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Re: Front rotors 1987 GL1200 Aspencade

Postby MikeB » Wed Nov 25, 2015 2:49 pm

The GL1200 rotors will most likely have an R and L stamped into the right and left rotor if they are OEM. Honda always puts a marking of some kind on the rotors.
Go the listing where you bought the rotors and look at the pictures closely. You should see the markings if the pictures are focused reasonably well.
MikeB
Tacoma, WA, USA

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WingAdmin
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Re: Front rotors 1987 GL1200 Aspencade

Postby WingAdmin » Wed Nov 25, 2015 3:18 pm

Look at the scribed slots on the rotors. When installed correctly, the slots go from the outside to the inside when the wheel is rotated forward, on both sides:

GL1200 Front Wheel
GL1200 Front Wheel

bikertucker
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Motorcycle: 1987 GL1200A Aspencade

Re: Front rotors 1987 GL1200 Aspencade

Postby bikertucker » Wed Nov 25, 2015 3:26 pm

Thats what I was going for too. See no L or R stamped on any of the four rotors. Just (MIN TH 8mm) on all four.
And they do look identical to the drawing of them on the Honda parts list. I did see after market ones listed on e-bay
but they looked different. Thanks for your quick replies. Mowing the yard for the family showing up tomorrow.
Happy TG.

bikertucker
Posts: 9
Joined: Sun Jul 15, 2012 3:18 pm
Location: Pelzer, sc
Motorcycle: 1987 GL1200A Aspencade

Re: Front rotors 1987 GL1200 Aspencade

Postby bikertucker » Wed Nov 25, 2015 3:31 pm

Ahhh, Good Job. Just saw your post on slot curve as the indicator. Slap my own forehead for looking at it and not
seeing it. Excellent!!!

Thank You

Tim

bikertucker
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Motorcycle: 1987 GL1200A Aspencade

Re: Front rotors 1987 GL1200 Aspencade

Postby bikertucker » Wed Nov 25, 2015 11:41 pm

Just looked at my question and replies. Only 1hr. 19 min. from start till finish. Great Group!!

tbeiler
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Motorcycle: 1986 Goldwing Aspencade,
1985 Goldwing LTD
1983 CX650 Turbo

Re: Front rotors 1987 GL1200 Aspencade

Postby tbeiler » Fri Nov 27, 2015 9:03 am

Hey Guys, not to throw a wrench at this thread, bu my 86 Aspencade has 10 mm rotors with minimum thickness at 9mm.
Did they change rotor thickness for the 87 year?

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MikeB
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Re: Front rotors 1987 GL1200 Aspencade

Postby MikeB » Fri Nov 27, 2015 2:35 pm

The Interstate had different brake rotors than the Aspencade. The Interstate rotors were 4mm min and the Aspencade rotors were 9mm min.
MikeB
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tbeiler
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Re: Front rotors 1987 GL1200 Aspencade

Postby tbeiler » Fri Nov 27, 2015 7:53 pm

Hey biketrucker - let us know what your rotors meaure at, Since you have the Aspencade, according to the thread, thickness is 9 mm minimum, you state in previous thread that 8mm is minimum on your new rotors. Whats going on? Different rotors, different thickness than stock.

bikertucker
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Re: Front rotors 1987 GL1200 Aspencade

Postby bikertucker » Wed Dec 02, 2015 7:41 pm

Sorry for the delay, have been busy with other things. I think I stated (min th 8mm) was molded on the inside of each
rotor. On closer inspection it looks like the mold was slightly over filled and what I thought was a #8 is instead a slightly
distorted #9 so all should be well. Both measure between 10 and 10.1 mm. Buffed up outside center of each disk
and repainted. All is re-assembled but to late for test ride. Maybe tomorrow.

bikertucker
Posts: 9
Joined: Sun Jul 15, 2012 3:18 pm
Location: Pelzer, sc
Motorcycle: 1987 GL1200A Aspencade

Re: Front rotors 1987 GL1200 Aspencade

Postby bikertucker » Thu Dec 03, 2015 4:54 pm

Finished a test ride and all is very well. Left rotor had been warped since I bought the bike. Seems my stopping distance
has decreased also. Did not expect that, but never had a warped rotor on a bike before. Thanks everyone for your assistance,
questions, and keeping me on my toes.

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geraldm
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Motorcycle: 86 gl1200 Aspencade

Re: Front rotors 1987 GL1200 Aspencade

Postby geraldm » Fri Dec 04, 2015 12:43 pm

Good info on the slots wing . if nothing else I will remember that . No wonder mine were on backwards everything that I have checked on the front end has been botched in one way or another but by the time I am done I should have a pretty good understanding on the TRAC front end ( I have the same front end on my drag bike so will probably have a look at that also before it hits the track in the spring ..)
My rotors also have a min. 9mm on them . According to the info in this thread mine were on backwards , not oem I don't think there are numbers however and go as follows at least for these rotors ( Right side OF3 with a small 2 behind ) .. thanks Geraldm :mrgreen:
( Left OF4 with a small 2 behind )

bikertucker
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Location: Pelzer, sc
Motorcycle: 1987 GL1200A Aspencade

Re: Front rotors 1987 GL1200 Aspencade

Postby bikertucker » Fri Dec 04, 2015 9:19 pm

Thanks for the added info, and good luck.

flash1942
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Re: Front rotors 1987 GL1200 Aspencade

Postby flash1942 » Sat Dec 05, 2015 10:49 am

One interesting thing I have come across is crud build up behind brake piston "O" rings. Over time a consistent layer of crud shows up between the O ring piston seal and the caliper body and it keeps building up and causing the piston(s) to not retract properly, causing the pads to drag. That wears the pads and creates heat. This happens slowly too.
You must remove the caliper and take it apart then remove pistons and their seals then carefully clean out the crud manually plus clean the pistons. Put in new seals and reassemble using a good disc brake lubricant then install and bleed properly.
As I understand it the crud is caused by the aluminum inside the piston cavity reacting with the fluid over time, causing a gradual build up. Honda later fixed this by plating the piston bores.

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WingAdmin
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Re: Front rotors 1987 GL1200 Aspencade

Postby WingAdmin » Mon Dec 07, 2015 2:46 pm

flash1942 wrote:As I understand it the crud is caused by the aluminum inside the piston cavity reacting with the fluid over time, causing a gradual build up. Honda later fixed this by plating the piston bores.


It's not the fluid it is reacting with, it's water. Moisture in the system is heavier than brake fluid, so it ends up pooling in the caliper. Flush your brakes with fresh fluid every year or two to get rid of the moisture and you will reduce this problem to almost nil.




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