GL1200 bone jarring bumps


Information and questions on GL1200 Goldwings (1984-1987)
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golden highway
Posts: 327
Joined: Mon Dec 31, 2012 9:23 am
Location: Louisville, Kentucky
Motorcycle: 1987 Interstate
1998 Aspencade

GL1200 bone jarring bumps

Postby golden highway » Sun Nov 30, 2014 4:23 pm



Since I bought my GL1200 I have never been thrilled with how hard the front end jarred the whole bike. The anti dive was set on 2. I didn't want to go to 1 for fear it would be way to soft and dive more during braking. My back was hurting today and every bump caused pain. I decided to stop and adjust the anti dive to 1 because I couldn't take the pain anymore. As I was adjusting the setting I thought I am going to set it to 3 going against all logic in my thinking. What a difference. It was as smooth as silk. No more jarring from every bump in the road and the bike handles so much better. The front end is way more controlled on the back roads. I am going to try 4 next time out. All these years being beat up by every bump in the road could have been avoided by simply turning a screw. :oops:



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Aussie81Interstate
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1981 GL1100 Interstate (sold)
1988 GL1500

Re: GL1200 bone jarring bumps

Postby Aussie81Interstate » Sun Nov 30, 2014 9:56 pm

You may have been looking at the anti-dive adjustment the wrong way the whole time.

I think the setting are showing the number when pointed towards the front of the bke for correct orientation.

so quite easily number two may have actually been number 4?

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golden highway
Posts: 327
Joined: Mon Dec 31, 2012 9:23 am
Location: Louisville, Kentucky
Motorcycle: 1987 Interstate
1998 Aspencade

Re: GL1200 bone jarring bumps

Postby golden highway » Sun Nov 30, 2014 10:14 pm

There is a large dot on screw adjustment that I assume indicates what number it is set on. I think what was happening is number 2 is a slow response causing the front end to hit hard. The number 3 is a faster quicker response. I think the adjustments are for how quick the shock responds not how stiff. I could be completely wrong. This is my best uneducated reasoning. If anyone knows for sure please speak up.

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Aussie81Interstate
Posts: 682
Joined: Thu Nov 27, 2014 2:34 am
Location: Penrith Australia
Motorcycle: 1982 CX500 Turbo (restoration project)
1981 GL1100 Interstate (sold)
1988 GL1500

Re: GL1200 bone jarring bumps

Postby Aussie81Interstate » Sun Nov 30, 2014 11:08 pm

I'll look up the user manual when I get home and let you know for sure.

The anti-dive settings are similar on most honda models.

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WingAdmin
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Re: GL1200 bone jarring bumps

Postby WingAdmin » Sun Nov 30, 2014 11:25 pm

From the owner's manual:

T.R.A.C.Anti-dive adjuster

The T.R.A.C. system reduces nose-dive during braking and may be adjusted to the rider's choice, independent of load or the rider's weight. The adjusters are located on the right and left front forks and can be set to any one of four positions.

Warning
* Make absolutely sure that the right and left adjusters are set to the same positions.
* Do not position the adjusters between the numbered adjustment points.

1: Light anti-dive
2: Medium
3: Hard
4: Maximum anti-dive

If you look at your front calipers you'll see that the bottom caliper mount is connected to the TRAC piston. When the bike is in motion and the front brake is applied, the caliper actually moves, pushing the TRAC piston inward, which closes a valve and reroutes the damping fluid through smaller ports - the higher the TRAC number, the smaller the ports.

If things are working correctly (i.e. the TRAC system/piston isn't seized), the TRAC setting should have zero effect on your suspension unless your brakes are applied.

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Aussie81Interstate
Posts: 682
Joined: Thu Nov 27, 2014 2:34 am
Location: Penrith Australia
Motorcycle: 1982 CX500 Turbo (restoration project)
1981 GL1100 Interstate (sold)
1988 GL1500

Re: GL1200 bone jarring bumps

Postby Aussie81Interstate » Mon Dec 01, 2014 2:54 am

Possibly wouldn't hurt to check the volume of oil in the shocks - could also be the springs are shot. I'd be going for less than normal oil level.

Having had a similar situation on a cx500 - bottomed out really hard - and didn't like any potholes at all. I had the forks re-done - new seals, new oil, increased the fork weight oil to 20 grade, and added a 1" spacer to each fork. After two days I never knew what I was missing...now it feels firmer and safer.

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golden highway
Posts: 327
Joined: Mon Dec 31, 2012 9:23 am
Location: Louisville, Kentucky
Motorcycle: 1987 Interstate
1998 Aspencade

Re: GL1200 bone jarring bumps

Postby golden highway » Mon Dec 01, 2014 10:17 am

Oil level is good, it was just changed. I guess I will need to check my brakes since the changing anti drive settings changes the way my shocks react.




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