Bike is "bouncing" when cruising or decelerating - Kawasaki Vulcan Forum : Vulcan Forums
 
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post #1 of 7 (permalink) Old 08-06-2019, 12:10 PM Thread Starter
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Bike is "bouncing" when cruising or decelerating

Ok...so I have googled this and there are quite a few posts on this forum but this is a strange one, my kids bike was running fine Friday night, no complaints from the lad. Last night however he was complaining that the bike was bouncing, he could feel it in his chest and head, so I thought I would take it for a ride. The bike accelerates normally, when you get up to 40-50 MPH and let off the throttle the bike appears as if it is bouncing up and down (think small dabs of the brake pedal). I tried applying the front brake and that did not affect it, then I tried with the rear brake and that showed no change either. The three wheel weights look to be intact and in good condition, the brakes have about 2K on them and all front end bolts have been checked for issues. The only thing that he complained about on Friday was the suspension at the back was a bit harsh but I put that down to him having a passenger as it did not seem bad when I took it. Tonight I am going to take it out, take it up to speed and kill the engine to see if it still there (ruling out engine vibration as a culprit). Looking to see if anyone has any other suggestions that I may try...tires look in good condition and the wheels do not seem to have any dings/dent.
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post #2 of 7 (permalink) Old 08-06-2019, 01:49 PM
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post #3 of 7 (permalink) Old 08-06-2019, 01:53 PM Thread Starter
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Tried it on several roads as the first road was newly paved...all result in the same issue. Looking for anything to check other than what I listed.
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post #4 of 7 (permalink) Old 08-25-2019, 03:18 AM
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Same problem here. I'm thinking in looking at: chain+ sprokets assembly, deformed tires, oval wheels or bent fork. I have the bike for approx 5 months.
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post #5 of 7 (permalink) Old 08-25-2019, 06:58 AM
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Could the rear shocks be going bad?
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post #6 of 7 (permalink) Old 09-04-2019, 11:35 AM
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I had the same problem with my bike. After balancing the tires and tightening my spokes I still had the same problem. It turned out to be the rubber cash drives behind the rear sprocket had began to wear. I had roughly 1/2" of slack on my sprocket, like I could grab the sprocket with my hands and move it forward and back. I took everything apart and shimmed the rubber cush drives with some pieces of bicycle inner tube that I cut to fit. As if right now I have ridden that way for about 5000 miles with no issues.
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post #7 of 7 (permalink) Old 09-11-2019, 05:46 AM
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I've taken my bike to the shop for investiagation of the problems. Due to the result of the verifications, I've changed front and rear shocks and will reply with feedback after i get it back. Also, I'ved cleaned/tightin the chain and cleaned the brake callipers. We will see if the situation improves (the wheels seem fine).
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