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Shake During Deceleration?

  • Thread starter Thread starter Guest
  • Start date Start date
Just thought I'd give an update to this thread. I finally got around to installing my Shinko 230 on the front and it took care of maybe 80% of the shake but there is still just a faint wobble decelerating through 40mph. I have made sure both wheel are running true and the tires are not out of round. I have ordered some of the tire balancing beads to try out. I don't really think they will fix it but I wanted to try them anyway. I'm beginning to think that it is in the rear dampening as Rich suggested. This would make sense as to why it started when I replaced the rear tire with a stiffer sidewall tire
 
Here?s something to think about. 83 GS 1100E.If I let go of the bars I?ve got a wobble that starts at about 25-30 and would continue to a tank slapper if I let it go. Got Dunlop 404s everything solid and tight. Have a slipstreamer windshield,quick release. Checked everything numerous times but nothing was out of spec. Was going to buy new shocks ,front springs and seals and do a tear down,rebuild. On a very nice warm evening I went for a ride and left the windshield at home. Wobble gone! I even tried to force it to wobble at 50 mph and it self centered instantly. It?s the windshield causing the problem even though I measured 3 times to get it straight. As long as I hold on to the bars even,with no real force, it tracks perfectly.
 
red1100 said:
Here’s something to think about. 83 GS 1100E.If I let go of the bars I’ve got a wobble that starts at about 25-30 and would continue to a tank slapper if I let it go. Got Dunlop 404s everything solid and tight. Have a slipstreamer windshield,quick release. Checked everything numerous times but nothing was out of spec. Was going to buy new shocks ,front springs and seals and do a tear down,rebuild. On a very nice warm evening I went for a ride and left the windshield at home. Wobble gone! I even tried to force it to wobble at 50 mph and it self centered instantly. It’s the windshield causing the problem even though I measured 3 times to get it straight. As long as I hold on to the bars even,with no real force, it tracks perfectly.
Click to expand...


Interesting anecdote, I still haven't completely solved my problem. Everything I have done so far seems to help a little bit but the shake is definitely still there. My bike tracks perfectly straight, so I think we are experiencing different issues. It just seems as if the suspension is bouncing at around 45 MPH. It has now started doing it when cruising and decelerating, but not when accelerating. After looking VERY carefully at the rear wheel/tire, it seems that it may be just slightly out of round. I am not sure if this is the wheel or tire causing it, but I figure I will look into it when I am ready for a new rear tire and go from there.
 
Most every ?bounce? situation I?ve had has been out of round or out of balance. Had a Super gas 71 Duster start shaking the slicks at speed turned out the wheel weights were not taped and came off. I have a 53 Buick restomod that has some custom wheels,one was .015 out of round and caused a shake.
 
+1 on the tire issue.


Some time ago my CB650 Nighthawk was fine except for a worn out front tire. Had a new front tire mounted that a local shop had in stock. It then developed the deceleration shake that seemed to be worse when going down hill. Took the bike in, had the bearings checked and a different front tire installed. Its OK again. (Since then I've read that some of the Nighthawks are picky about their tires.)


After that I tried to cause the shake to occur. Positioning my butt off to one side so that the bike is tilted a bit sometimes causes the deceleration shake.
 
jabcb said:
+1 on the tire issue.


Some time ago my CB650 Nighthawk was fine except for a worn out front tire. Had a new front tire mounted that a local shop had in stock. It then developed the deceleration shake that seemed to be worse when going down hill. Took the bike in, had the bearings checked and a different front tire installed. Its OK again. (Since then I've read that some of the Nighthawks are picky about their tires.)


After that I tried to cause the shake to occur. Positioning my butt off to one side so that the bike is tilted a bit sometimes causes the deceleration shake.
Click to expand...

I'm thinking it's the rear tire, what I don't know is if I got a bad tire or if my rim is what's causing it. I can't see the rim wobble at all if I put a truing pointer on it, but I haven't taken the tire off yet to check where the bead rests, maybe there is a flake of rust or something that I missed. It is also possible that the bead has not seated properly onto the rim, once again I see no evidence of this from the outside. The only other thing I changed was that this new rear tire is a 120/90/18 vs the last one which was a 110/90/18 but I hear many other owners go with the 120 with no issue. My bike goes through rear tires fast enough for me to just wait until it's time for a new one to deal with it. I'm at maybe 50% life now. I will post an update if I find the cause.
 
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