left turn bias


Information and questions on GL1500 Goldwings (1988-2000)
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NevadaDave
Posts: 15
Joined: Tue Sep 15, 2009 11:48 pm
Location: Carson City, NV
Motorcycle: 1999 GL1500SE

left turn bias

Post by NevadaDave » Sun Nov 10, 2019 1:26 am



I recently put new tires on my 99 1500SE, and wanted to try radials, so I got a set of Shinko 890's. They made the bike very responsive, and kind of "tippy" until I bumped the pressure up (bike shop had them at 34 psi). However, new tires did not fix a problem I have had for a while, and that is a noticeable left-turn bias. If I am on cruise control, and let go of the bars, the bike will immediately start going left. If I make a left turn, the bike constantly feels like it wants to "fall into" the turn, requiring constant correction, whereas right turns are very neutral feeling. I realize that this is something kind of alignment issue, but what is there to align?



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bluthundr31
Posts: 482
Joined: Tue Jul 11, 2017 11:43 pm
Location: Morgan Hill, CA.
Motorcycle: 1991 GL1500 Interstate (Cinnamon Beige)

Re: left turn bias

Post by bluthundr31 » Sun Nov 10, 2019 1:54 am

There are too many possible causes, , , but my first thought is,
Have you considered a Fork Brace to stiffen up the front forks and make them more "solid-feeling"?

Maybe consider jacking up the front end and see if you get "wobble" when you force the wheel to the left. Make sure all the bolts/nuts are tightened down correctly.

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Rambozo
Posts: 309
Joined: Sun Apr 01, 2018 8:36 pm
Location: Disneyland
Motorcycle: 1992 GL1500 Aspencade

Re: left turn bias

Post by Rambozo » Sun Nov 10, 2019 4:34 am

Maybe take out some of those gold bars you carry around in the left saddlebag?

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Happytrails
Posts: 933
Joined: Wed Sep 04, 2013 6:13 pm
Location: Natrona Hgts, Pennsylvania
Motorcycle: 1991 Goldwing 1500 SE
2018 Ural Gearup

Re: left turn bias

Post by Happytrails » Sun Nov 10, 2019 9:40 am

34 lbs is very low (too low imho) a tire pressure but understand why shops do it. When I get my bike inspected they air down my tires the same way. Have you owned this bike for awhile and only just noticed this after mounting up radial tires? Could be when the wheel was reinstalled that it wasn't aligned properly in the forks. If its not correct it could steer to one side like that.
1991 GL1500 SE Anniversary Edition
Sun Flare Gold Metallic
Vallant Brown Inset

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ct1500
Posts: 1178
Joined: Wed Nov 10, 2010 8:09 pm
Location: Glastonbury,CT
Motorcycle: 1988 GL1500
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Re: left turn bias

Post by ct1500 » Sun Nov 10, 2019 10:41 am

If the pull to the left was there when you bought it then it was likely wrecked and something is bent. You will be lucky to get 10k miles out of the Stinkos.
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NevadaDave
Posts: 15
Joined: Tue Sep 15, 2009 11:48 pm
Location: Carson City, NV
Motorcycle: 1999 GL1500SE

Re: left turn bias

Post by NevadaDave » Sun Nov 10, 2019 11:55 am

Welllll.... I don’t have any gold bars on the left :D , but I’m going to check for looseness in the steering head (although it has never shown any other indication of looseness) and see if there is a simple way to check alignment.
As far as something bent, Since I have had it, it has always had a left turn tendency, so perhaps something is, in fact, bent. Stay tuned for further developments!

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Rambozo
Posts: 309
Joined: Sun Apr 01, 2018 8:36 pm
Location: Disneyland
Motorcycle: 1992 GL1500 Aspencade

Re: left turn bias

Post by Rambozo » Sun Nov 10, 2019 12:16 pm

Some string and a tape measure will let you do a pretty good frame, fork, wheel alignment check. There have been plenty of articles in motorcycle mags about how to do that. I'm sure Google can locate an online version.



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