« previous next »
Pages: [1] 2

Author Topic: Vibration at high RPM/SPEED  (Read 3798 times)

Pavel_proo

  • Newbie
  • *
  • Posts: 21
    • View Profile
Vibration at high RPM/SPEED
« on: March 12, 2021, 11:12:03 PM »
Hello everyone, I was lucky enough to get my hands on a 2009 250ri. With super low mileage. It pretty much didn't move until I purchased it. Upon purchase I have immediately noticed that the bike vibrates(mostly feels at floorboards) at rpms higher than 6500 and at speeds above 62mph or so. I have already replaced both original tires and balance wheels, not much difference. I have went further and replace the belt, what improved things slightly, but not enough. I have already checked valve clearances and adjust properly. Any suggestions as to where else to look?
Otherwise the scooter seems to drive just fine with good acceleration, etc.
« Last Edit: March 12, 2021, 11:34:38 PM by Pavel_proo »
Logged

JJJoseph

  • Hero Member
  • *****
  • Posts: 892
  • Kymco Sento
    • View Profile
Re: Vibration at high RPM/SPEED
« Reply #1 on: March 14, 2021, 05:51:57 AM »
Helkp us out: what is a "250ri"??
Logged

Kansas kymco

  • Hero Member
  • *****
  • Posts: 2044
  • Mcpherson KS or Ely MN
    • View Profile
Re: Vibration at high RPM/SPEED
« Reply #2 on: March 14, 2021, 03:36:47 PM »
I know your getting close to red line on the tach so I could see a little added vibration.   I had a vibration on my 09 250 RI above 55mph but mine was a front wheel out of balance. Previous owner had new City Grip's installed and balanced but the front tire was off balance.
Logged
In parts 200S and Grand Vista and my motorcycles 2 CS BMW'S and one GS BMW.

Sold-32 Kymco scooters of various sizes this summer.

Stig / Major Tom

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 14651
  • Rural Ohio
    • View Profile
Re: Vibration at high RPM/SPEED
« Reply #3 on: March 14, 2021, 03:38:15 PM »
Quote from: JJJoseph on March 14, 2021, 05:51:57 AM
Helkp us out: what is a "250ri"??



Stig
Logged
Boston Strong
Rural Ohio

And, I'm feeling a little peculiar.

Neil955i

  • Hero Member
  • *****
  • Posts: 4505
  • Cheshire, UK. The older I get, the faster I was...
    • View Profile
Re: Vibration at high RPM/SPEED
« Reply #4 on: March 15, 2021, 10:36:27 AM »
Define "super low mileage"?  If less than 3K miles, I'd say wait until it's done a few more before looking to fix any "problem".  I had similar with my X-Town 300i from new and this all but disappeared at about 3,000 miles.  I put it down to full smoothness (if a single-pot bike can ever be classed as "smooth") not being reached until the scooter is properly broken in?
Logged
Regards & ride safe,
Neil

Current garage:  Kymco DTX360 & Triumph Street Triple 675R
Past bikes: BSA C15. Honda S/wing (GL500). Kawasaki GPz750. BMW K100RS. Kawasaki GPZ900R. Yamaha FJ1200 x2. Sprint. Triumph Daytona 900. Kawasaki ZX-7R. T595 Daytona. Kawasaki ZX-9R x2. Triumph Daytona 955i. X-Town

CROSSBOLT

  • Hero Member
  • *****
  • Posts: 7758
  • West Tennessee, USA
    • View Profile
Re: Vibration at high RPM/SPEED
« Reply #5 on: March 15, 2021, 02:24:21 PM »
Vibration in sync with road speed or engine speed?
Logged
Karl

Three motorcycles 1960-1977 (restored a 1955 BSA)
Agility 50
Yager 200i
Downtown 300i
Navy tech, Ships Engineer, pilot and aircraft mechanic

Neil955i

  • Hero Member
  • *****
  • Posts: 4505
  • Cheshire, UK. The older I get, the faster I was...
    • View Profile
Re: Vibration at high RPM/SPEED
« Reply #6 on: March 16, 2021, 09:46:50 AM »
Quote from: CROSSBOLT on March 15, 2021, 02:24:21 PM
Vibration in sync with road speed or engine speed?

I'm guessing it will be engine speed (mine was) rather than an unbalanced wheel?
Logged
Regards & ride safe,
Neil

Current garage:  Kymco DTX360 & Triumph Street Triple 675R
Past bikes: BSA C15. Honda S/wing (GL500). Kawasaki GPz750. BMW K100RS. Kawasaki GPZ900R. Yamaha FJ1200 x2. Sprint. Triumph Daytona 900. Kawasaki ZX-7R. T595 Daytona. Kawasaki ZX-9R x2. Triumph Daytona 955i. X-Town

Pavel_proo

  • Newbie
  • *
  • Posts: 21
    • View Profile
Re: Vibration at high RPM/SPEED
« Reply #7 on: March 19, 2021, 06:32:15 PM »
It seems to be more engine speed related.
I am still not sure where to look.
Logged

Pavel_proo

  • Newbie
  • *
  • Posts: 21
    • View Profile
Re: Vibration at high RPM/SPEED
« Reply #8 on: March 19, 2021, 06:33:14 PM »
Quote from: Neil955i on March 15, 2021, 10:36:27 AM
Define "super low mileage"?  If less than 3K miles, I'd say wait until it's done a few more before looking to fix any "problem".  I had similar with my X-Town 300i from new and this all but disappeared at about 3,000 miles.  I put it down to full smoothness (if a single-pot bike can ever be classed as "smooth") not being reached until the scooter is properly broken in?
280 miles at time of purchase 8)
1500 now
Logged

CROSSBOLT

  • Hero Member
  • *****
  • Posts: 7758
  • West Tennessee, USA
    • View Profile
Re: Vibration at high RPM/SPEED
« Reply #9 on: March 19, 2021, 09:41:00 PM »
Quote from: Neil955i on March 16, 2021, 09:46:50 AM
I'm guessing it will be engine speed (mine was) rather than an unbalanced wheel?
Engine speed, may have a stuck or damaged roller in the variator..
Logged
Karl

Three motorcycles 1960-1977 (restored a 1955 BSA)
Agility 50
Yager 200i
Downtown 300i
Navy tech, Ships Engineer, pilot and aircraft mechanic

Pavel_proo

  • Newbie
  • *
  • Posts: 21
    • View Profile
Re: Vibration at high RPM/SPEED
« Reply #10 on: March 20, 2021, 01:56:30 AM »
Quote from: CROSSBOLT on March 19, 2021, 09:41:00 PM
Engine speed, may have a stuck or damaged roller in the variator..
I got Tech Pulley Flying Roller II sliders installed today. Will report tomorrow as to how that worked out.
By the way Tech Pulley is supposedly a next gen of Dr. Pulley and claims to be even better preforming.
« Last Edit: March 20, 2021, 01:58:59 AM by Pavel_proo »
Logged

Pavel_proo

  • Newbie
  • *
  • Posts: 21
    • View Profile
Re: Vibration at high RPM/SPEED
« Reply #11 on: March 26, 2021, 08:03:58 PM »
Sorry for no updates. Bike doesn't start. Will update once fixed.
Logged

Pavel_proo

  • Newbie
  • *
  • Posts: 21
    • View Profile
Re: Vibration at high RPM/SPEED
« Reply #12 on: April 02, 2021, 02:00:35 AM »
So, got the bike fixed all good now.
However as for vibration it seems perfectly smooth up to about 65 mph when vibration starts and gets gradually worse with 70+ being uncomfortable quite a bit. With new sliders the cruising rpm went down so that's probably why the vibration now starts at a higher speed. So it is definitely engine speed related and not ground speed related.
Logged

Kansas kymco

  • Hero Member
  • *****
  • Posts: 2044
  • Mcpherson KS or Ely MN
    • View Profile
Re: Vibration at high RPM/SPEED
« Reply #13 on: April 02, 2021, 02:18:03 AM »
Quote from: Pavel_proo on April 02, 2021, 02:00:35 AM
So, got the bike fixed all good now.
However as for vibration it seems perfectly smooth up to about 65 mph when vibration starts and gets gradually worse with 70+ being uncomfortable quite a bit. With new sliders the cruising rpm went down so that's probably why the vibration now starts at a higher speed. So it is definitely engine speed related and not ground speed related.
65 mph on mine is red line. What's red line now with the new sliders?
« Last Edit: April 02, 2021, 02:20:58 AM by Kansas kymco »
Logged
In parts 200S and Grand Vista and my motorcycles 2 CS BMW'S and one GS BMW.

Sold-32 Kymco scooters of various sizes this summer.

Pavel_proo

  • Newbie
  • *
  • Posts: 21
    • View Profile
Re: Vibration at high RPM/SPEED
« Reply #14 on: April 02, 2021, 01:32:35 PM »
Quote from: Kansas kymco on April 02, 2021, 02:18:03 AM
65 mph on mine is red line. What's red line now with the new sliders?
I tried pushing it to 80mph(8000+ rpm) yesterday two up and it did fine except for engine vibration.
Right now 65mph is just slightly over 6500rpm. 23g tech pulley flying roller II sliders and malossi belt.
I am actually starting to think that what I describe as a vibration is really a normal motor vibration for a a 1 cylinder.
« Last Edit: April 02, 2021, 11:13:55 PM by Pavel_proo »
Logged

An Error Has Occurred!

Call to undefined function split()
Back