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Old November 18th, 2019, 10:35 AM   #1
lavarsios
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Wobbling on high speeds.

Another day,another issue its seems.
I have a new issue with the rear end.I can feel wobbling on the rear end in high speeds.It starts to be noticeable on over 110+ kmh and up to top speed.It's not high frequency it's almost there are bumps in the road but in order to be sure,i drove in the same roads i rode almost everyday and i can say for sure it's from the rear end.It's speed dependable and not rpm.It's getting a LOT more ugly with passenger on and i don't know what to look for.My chain slack is in the limits,i don't think i have a misalignment in the rear wheel and i don't have brake drag.As a side note i think my ninja has become lazier and it's top speed won't pass 140kmh.I don't know if it has to do something with that but...
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Old November 18th, 2019, 10:38 AM   #2
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I'd start by checking the balance of the rear wheel.
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Old November 18th, 2019, 10:43 AM   #3
lavarsios
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I'd start by checking the balance of the rear wheel.
The wheel had been balanced from the guy who installed me my rear tire,and as i can see no weight has been flown away.It was the first think i checked.
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Old November 18th, 2019, 11:29 AM   #4
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When did the problem start? Right after the tire was installed, or later?
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Old November 18th, 2019, 07:19 PM   #5
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Question

How many miles on the rear tire? What brand of rear tire? What PSI is in the rear? Is the rear rim bent? Put it on a rear stand and see if any wobbles.
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Old November 18th, 2019, 08:58 PM   #6
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Originally Posted by JFMNINJA400 View Post
How many miles on the rear tire? What brand of rear tire? What PSI is in the rear? Is the rear rim bent? Put it on a rear stand and see if any wobbles.
We need to get him to answer the previous question first, and go from there.
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Old November 18th, 2019, 11:06 PM   #7
lavarsios
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The rear tire was installed on march/april.Less than 10k on the rear and it has a lot of meat yet.Michelin power rs 150/60 if i remember corect.The problem started lately.I believe it might had started after i reduce the chain slack.I am not sure though cos i didn't drive at high speed right after.Rim is not bend.nothing out of shape.What i red in the net is that it might be a tight spot in the chain but how can i find it?!Also on rear stands i don't feel any womble on the rim/tyre BUT my chain some times and on high speeds jumps around for no apparent reason.
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Old November 19th, 2019, 06:30 AM   #8
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OK, now we're getting more information. The chain jumping around at high speed pretty much says you need a new one, but to be sure of what's happening, put the bike on its center stand and rotate the rear wheel, observing the chain movement, how much slack there is, etc.. If it's anything but smooth movement and if even one link is stiff, get a new chain. Inspect both sprockets too, because especially when a bad chain has been running on them, they're likely to need replacing at the same time.

If the chain is causing the problem, it's a dangerous condition. A broken chain can cause a crash. Don't wait, check it before riding any more.
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Old November 19th, 2019, 08:09 AM   #9
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The chain is pretty new i think less than 20k on it. I cleaned it about 400klm ago.The slack on both axis,left right,up and down is ok.I will find some time and fix it.Do you know what kind of chain i should buy?
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Old November 19th, 2019, 08:31 AM   #10
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You got 10/k miles out of a Michelin RS rear tire? You can fit a 150/60 on the stock rim without an issue?

Driven and RK make excellent chain replacements. You canít go wrong with any name brand chain. Like Jim said, replace both sprockets at the same time.
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Old November 19th, 2019, 09:22 AM   #11
lavarsios
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easy 10k and it has a lot more to give.somewhere around 2/3 on the middle.The only issue with 150 on the rear was the chicken strips but meh as for the sprockets they are basically new,and also a new info.I just spoke with the privious owner and he had changed both chain and sprockets.And i believe him because everything looks new.The chain and sprockets after checking the service book have around 10k on them.And i clean/grease them frequently.
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Old November 19th, 2019, 09:54 AM   #12
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Yeah, I could only fully use 150 rear-tyre with 4.5" rear wheel.

Inspect chain for tight/locked-up links. Sometimes, there's installation errors at shop using wrong tool and it pinches plates together. Also big discussion on EX-500.com about possible counterfeit RK chains.
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Old November 19th, 2019, 10:04 AM   #13
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How do you fix a tight/stucked pin?
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Old November 21st, 2019, 01:38 AM   #14
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Quote:
Originally Posted by lavarsios View Post
How do you fix a tight/stucked pin?
Replace chain. Unless your working with a brand new chain and accidentally riveted the masterlink to tight, in which case you remove and start over with riveting the masterlink again
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