Author Topic: vibrations at 110 kmh  (Read 965 times)

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Offline crispenator

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vibrations at 110 kmh
on: July 16, 2020, 04:22:03 AM
Hi all took the scooter out for a run along the expressway today first time doing over 80kmh i noticed when i got to around 110 kmh i seemed to be getting a lot of engine vibration through the bars as if the engine was really revving but it wasn't i this a normal thing for this bike, at 100 just cruises along no problems ,could it be the chain or sprockets ?

Offline Aggie95

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Re: vibrations at 110 kmh
Reply #1 on: July 17, 2020, 02:08:03 AM
Is it possible you have Givi bars on your bike?  Does the vibration occur at about 4500-5500 RPM?

If so, the links below discuss this at great length.

Givi Engine Bars - Vibration
Missing Engine Mounting Bolt

I had this problem also, and you will find a couple of my posts in these threads.  I solved the problem by changing the bolts to 5 mm longer bolts and torquing them to Honda specs for this size bolt (torque value found in the repair manual).  I confirmed the bolts were loosening off because of too little thread engagement.  Before, the vibration would stop when I re-torqued the bolts but return in about 2K miles.  Since I installed the longer bolts, I have experienced no more vibration. 

Hope this helps :821:
Last Edit: July 17, 2020, 02:49:59 AM by Aggie95

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Offline crispenator

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Re: vibrations at 110 kmh
Reply #2 on: July 17, 2020, 02:22:13 PM
Hi mate i dont actually have any crash bars on my bike yet thats why i was leaning towards maybe the sprockets or chain .

Offline Aggie95

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Re: vibrations at 110 kmh
Reply #3 on: July 17, 2020, 03:27:49 PM
Hmm  :084:  haven't heard of anyone having this problem.  Everyone says this bike is very smooth!

As for your chain and sprockets, stiff links can cause some small rattling/vibration, or very worn sprockets can cause some vibration.  But, I don't think either would be associated with a particular speed...   :187:

1971-1973: '67 CL77 (305 Scrambler), Sold, because my wife said to...
2018: '14 CB500X, The dream bike of my youth!  Thanks, Son

Offline AJC500

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Re: vibrations at 110 kmh
Reply #4 on: July 17, 2020, 06:28:17 PM
Yeah, my chain is on it's last legs with a few stiff links (it'll be replaced, probably with sprockets, at the next service), but I have no vibration from it.  I would note that it is adjusted to the required slack at the tightest spot.

I don't get any significant vibration, other than maybe a tingle through the bars and pegs at (I guess), around 5-6000rpm and maybe 65-70mph, but it's really not much more than anyone would expect from a motorcycle and I find the bike pretty smooth.

Check chain for tight spot, and maybe wheels for balance and tyres for uneven wear?
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Offline Wedgetail

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Re: vibrations at 110 kmh
Reply #5 on: July 18, 2020, 01:39:12 PM
These bikes have a widely reported (to the extent that I assume it is universal) harsh spot at 5200rpm.

Offline Swanny

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Re: vibrations at 110 kmh
Reply #6 on: July 18, 2020, 08:29:16 PM
I thought I noticed the vibes once but they seem to have gone
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Offline Prestone

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Re: vibrations at 110 kmh
Reply #7 on: July 28, 2020, 09:14:08 AM
Mine started to vibrate like a harley when the chain and sprocket where worn out, the front sprocket died first and had the teeth bending a bit

Offline Falang

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Re: vibrations at 110 kmh
Reply #8 on: July 29, 2020, 02:09:12 AM
You can try checking your chain slack, then turning the back wheel 90 degrees and checking it again. Of course it should be exactly the same. If not, then the sprockets have worn elliptically and you will have vibration for sure. The chain, sprockets, and perhaps the rear wheel bearings need to be changed right away.
This happened to me on my 2013 with 18,000 km on the chain and only 8,000 km on the rear wheel bearings. The chain slack varied by about half an inch when the back wheel was turned.
It turned out that the Honda dealer who had replaced the rear wheel bearings 8,000 km previously had not seated them correctly, so they caused uneven chain wear. Another Honda dealer had to replace them again while I was on the road, in Thailand. The reason the rear wheel bearings had been replaced 8,000 km ago was the previous owner had used a pressure-washer to wash the bike, and they had rusted out. That made the rear hub rusty, which made it very difficult to re-seat the new bearings all the way into the hub. Still the first Honda dealer had not done the replacement correctly. One thing lead to another ... a Honda chain, two sprockets, and a set of rear wheel bearings were US$235, including installation by Honda, mostly for the cost of the chain and sprockets.
Last Edit: July 29, 2020, 02:43:58 AM by Falang

Offline crispenator

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Re: vibrations at 110 kmh
Reply #9 on: July 29, 2020, 05:09:41 AM
Hi all thanks for all the replies i think wedgetail might be on the money as 5200 would be around the rev range for 110 kmh as i said at 100kmh smooth as as with other speeds i have spare sprockets 16 and 15 chain is not bought yet ,wheel bearings seem to be ok no harshness when turning the rear wheel normal sound from chain going over sprocket ,i did gave the chain a thorough clean with kero about a week or so ago and relubed it with chain lube which is very sticky . The bike has done just over 5500km but i think it was layed up for a while so falang you may well be right it was on the gold coast and suffered slightly from salt air exposure as evident by some of the corrosion i have found on alloy and steel washers what i might do is take a temperature reading after a short ride on the back wheel if it is red hot then it may be bearings but dont really want to pull good bearings if i dont have too thanks again for all your replies appreciated ,oh falang my extended family are in bangkok ,nong kom patom and chonburi my brother and sister are both cops but they are good people .

 



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