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Author Topic: Cb500 unstable in turns after new parts  (Read 366 times)

Offline AJWatUC

  • Posts: 118
Cb500 unstable in turns after new parts
« on: Sep 21, 2017, 08:35:16 »
Hi I was hoping maybe you could give me some tips or insight.  I have a 1973 CB500 I rode it for the first summer I had it. It rode great except the rear springs had been cut so going over any bump would nearly break your back.  The forks seals were leaking, and the triple tree clamp was cracked.  I waited till winter to fix everything. I orderes a used triple tree off eBay and took my wheels and forks off to a shop to have new wheel bearings put in and fork seals.  I put everything back together and noticed the bike felt unstable in turns so I started asking around and a lot of people said change steering stem bearings so I did.  I put the bike back together and still unstable in turns.  I tried replacing rear springs with used factory Honda springs.  I also Checked the fork oil and realized it had none.  So I put in 10w30 according to the manual.  Still it feels unstable in turns and I have stopped riding it altogether because it started feeling unstable at low speeds.  Any idea what I could check or try that I havenít already?  Thanks for any help.



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73 cb500

Offline semmins

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Re: Cb500 unstable in turns after new parts
« Reply #1 on: Sep 21, 2017, 09:34:15 »
Have you checked the tyre pressures?

Offline clem

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Re: Cb500 unstable in turns after new parts
« Reply #2 on: Sep 21, 2017, 09:39:01 »
What exactly do you mean by unstable? Does it feel like a noodle? Is it fighting you to turn? Is it on high speed or low speed turns? Do you think that it's going to fall over?
Just asking because it can be a worn suspension or rider input.

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"After every war there are soldiers who refuse to surrender. To this day there are still thousands who cling to their 30+ year old motorcycles, thinking that the war is still on, refusing to concede that the four-strokes have won"

1972 DS7 http://www.dotheton.com/forum/index.php?topic=45886.msg505995#msg505995
1983 CB550sc bobber http://www.dotheton.com/forum/index.php?topic=30599.30

Offline CrabsAndCylinders

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Re: Cb500 unstable in turns after new parts
« Reply #3 on: Sep 21, 2017, 12:18:55 »
Are you sure that you got the correct triple clamps?  Did you tighten the new triple clamps up properly?  With the front brake applied, try to move the bike back and forth to see if the triple clamp is loose.  As mentioned low tire pressure can cause instability.
« Last Edit: Sep 21, 2017, 12:20:32 by CrabsAndCylinders »
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Offline 1fasgsxr

  • Posts: 1075
Re: Cb500 unstable in turns after new parts
« Reply #4 on: Sep 21, 2017, 13:21:13 »
Old crappy tires ?? Broken or loose spokes ? Check all your bolts and nuts..

Offline AJWatUC

  • Posts: 118
Re: Cb500 unstable in turns after new parts
« Reply #5 on: Sep 21, 2017, 21:38:02 »
Are you sure that you got the correct triple clamps?  Did you tighten the new triple clamps up properly?  With the front brake applied, try to move the bike back and forth to see if the triple clamp is loose.  As mentioned low tire pressure can cause instability.
Pretty sure when I received them I visually checked them against originals.  I did torque the triple clamp up to whatís in the manual. 


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73 cb500

Offline frogman

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  • '74 CB360, '71 CB450, '75 CB550SS
Re: Cb500 unstable in turns after new parts
« Reply #6 on: Sep 22, 2017, 21:18:33 »
Ive found when messing around with stem bearings, especially tapered kits over the ball type that you if you torque them too much they can act funny, leaves a spot just off center that you will fight against trying to keep the bike straight. This will happen if you have the ball bearings as well if they are over tight.

Next time you are out, just loosen the top nut just a bit and see what happens. Take a screw driver and a hammer and tap it loose just a bit on the side of the road to see if it makes a difference.

Offline AJWatUC

  • Posts: 118
Cb500 unstable in turns after new parts
« Reply #7 on: Sep 30, 2017, 13:34:59 »
What exactly do you mean by unstable? Does it feel like a noodle? Is it fighting you to turn? Is it on high speed or low speed turns? Do you think that it's going to fall over?
Just asking because it can be a worn suspension or rider input.

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Noodle.. Itís been at speeds 35mph and lower because It feels to sketchy to go any faster


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73 cb500

Offline AJWatUC

  • Posts: 118
Re: Cb500 unstable in turns after new parts
« Reply #8 on: Sep 30, 2017, 13:37:58 »
Have you checked the tyre pressures?
Yes it was low but after filling it up didnít seem to change anything.


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73 cb500

Offline AJWatUC

  • Posts: 118
Re: Cb500 unstable in turns after new parts
« Reply #9 on: Sep 30, 2017, 13:39:13 »
Checked the balance of the wheels today and they  seemed good.  However the front wheel seems likes itís dragging on the axle


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73 cb500