June 15th, 2019, 01:05 PM | #1 |
ninjette.org member
Name: Seamus
Location: Toronto area
Join Date: Jun 2019 Motorcycle(s): 09 ninja 250r, 97 royal enfield bullet 500 Posts: 10
|
Bucking while leaned over?
Hey guys I’ve got an 09 ninja 250r with 55,000 km on it. I’ve only put about 20,000 km on it. While leaning it over I’ve noticed it starts bucking me off. It doesn’t start until pretty steep lean angles but it is quite disconcerting if I come into a corner a little hotter than I want to. Also it’s much more noticeable during left hand turns. Anyone have any ideas as to what’s causing it. Could it be a preload issue?
|
|
June 15th, 2019, 02:29 PM | #2 |
ninjette.org certified postwhore
Name: AKA JacRyann
Location: Mesa, AZ
Join Date: Dec 2011 Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C Posts: A lot.
MOTY - 2018, MOTM - Nov '17
|
Hi and welcome!
Something may be loose. Check and torque every nut & bolt related to suspension. Check wheel bearings. Inspect your tyres very carefully for blisters or bulging spots indicative of damaged casing. Fork service may be in order with new oil. |
|
June 15th, 2019, 03:11 PM | #3 |
ninjette.org guru
Name: john
Location: placerville
Join Date: Apr 2016 Motorcycle(s): ninja 300 Posts: 386
|
possible, high lean angles= high g-forces, could you be bottoming out in these high g turns, g out was a problem on my 300
|
|
June 16th, 2019, 02:52 PM | #4 |
ninjette.org member
Name: Garry
Location: Bungendore Australia
Join Date: Jan 2019 Motorcycle(s): GPX250 1989 model and 1990 model Posts: 98
|
Usually relates to a loose swing arm or bad wheel bearings. Possibly be worth checking the integrity of the fork bridge under the front guard and even tightness of the triple clamp bolts and steering head bearings. These things usually handle beautifully so something must have come loose or gotten bent!
__________________________________________________
Perpetua Culpa Alterna Vagus |
|
June 16th, 2019, 08:48 PM | #5 |
The Corner Whisperer
Name: Chris (aka Reactor)
Location: Northern KY
Join Date: May 2011 Motorcycle(s): 2010 250 (track), 1992 250, 2006 R6 (street/track), 2008 R6 (track) Posts: Too much.
MOTY 2015, MOTM - Nov '12, Nov '13
|
Check the easy stuff first;
1. Check tire pressure 2. ****Check chain slack**** 3. Bounce the bike to look/listen/feel for suspension movement 4. Lift the wheels and give them a spin checking bearings, for missing wheel spacers and overall tire condition 5. Check for a dragging front brake, rotors for warping and leaky fork seals while you got the front wheel in the air 6. Check rear rotor for warping and swingarm main bolt while you got the rear in the air 7. Check top and bottom motor mount bolts 8. Check steering stem nut and general triple clamp tightness 9. Put a zip tie on your upper fork leg and check for bottoming out and proper travel Now the hard stuff or stuff that will cost you more time and/or $$$. 1. Check fork legs for straightness 2. Check for proper fork oil consistency and level 3. Check spring rate (front and rear) 4. Check rear shock 5. If all else fails, get a new set of tires if they are even remotely close to suspect Hmmmmmmmm, gut feeling here. On left side, while only at lean.... Has the bike been sitting on the side stand for a long time without moving it? Outside? With 0/low tire pressure and in the cold? aka, check for flat spots on the tires. Welcome and good luck, please don't forget to follow up when you solve the problem. Pay it forward ya know. EDIT: Has the bike ever been down? And if so, what side?
__________________________________________________
Goal: Shake A Million Hands | Look through the corners | Track Day Prep | Closest track? | The Mid-Ohio School |
2 out of 2 members found this post helpful. |
June 17th, 2019, 07:16 AM | #6 | |
ninjette.org member
Name: Seamus
Location: Toronto area
Join Date: Jun 2019 Motorcycle(s): 09 ninja 250r, 97 royal enfield bullet 500 Posts: 10
|
Quote:
I will torque all the major bolts and see if that helps at all. |
|
|
June 17th, 2019, 10:37 AM | #7 |
Rev Limiter
Name: Jay
Location: WI
Join Date: Jul 2013 Motorcycle(s): '06 SV650n, '00 Derbi GPR, '64 CA77 Dream 305, '70 CL450 Scrambler, numerous dirt bikes Posts: A lot.
MOTM - Jun '18, Oct '16
|
How old are the tires, what brand are they, and what is their overall condition?
Any scalloping wear on the tread blocks? Were the pressures set properly? |
|
June 17th, 2019, 12:48 PM | #8 |
ninjette.org member
Name: Seamus
Location: Toronto area
Join Date: Jun 2019 Motorcycle(s): 09 ninja 250r, 97 royal enfield bullet 500 Posts: 10
|
I have 2 year old Micheal street radials. The front still looks brand new rear is starting to flatten out (I love twistys but I do a lot of touring) and pressures are 28 front 32 rear as speced on the swing arm. I took it through some twistys today pretty hard and it only started to act up on me in the exit of a right hand sweeper at the speed limit of 140km/hr let’s just say it was on the track
|
|
June 17th, 2019, 01:15 PM | #9 |
Rev Limiter
Name: Jay
Location: WI
Join Date: Jul 2013 Motorcycle(s): '06 SV650n, '00 Derbi GPR, '64 CA77 Dream 305, '70 CL450 Scrambler, numerous dirt bikes Posts: A lot.
MOTM - Jun '18, Oct '16
|
Can you describe more about how it wants to "buck you off"?
Does it feel like it's sliding and catching, or the front wants to tuck under? Does the front oscillate or wiggle? |
|
June 17th, 2019, 02:46 PM | #10 |
ninjette.org certified postwhore
Name: AKA JacRyann
Location: Mesa, AZ
Join Date: Dec 2011 Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C Posts: A lot.
MOTY - 2018, MOTM - Nov '17
|
First day on track this year, I felt front-end chattering in middle of steady-state corners. Only did it middle of long corners when I'm not on brakes or throttle. Talked to my coach/mentor about this. He bounced front-end up & down and said it was too "springy".
Turns out, I made mistake of rebuilding my forks over winter with 10w oil in attempt to get more front-end traction. Also zip-tie showed I'm 5mm away from using up all suspension-travel in front. So I replaced oil with 15w, turned up compression-damping a tiny bit, added 5mm more fork-oil than stock. Next time out, no more chattering and front-end feels firmly planted!!! |
|
June 17th, 2019, 04:37 PM | #11 |
ninjette.org member
Name: Seamus
Location: Toronto area
Join Date: Jun 2019 Motorcycle(s): 09 ninja 250r, 97 royal enfield bullet 500 Posts: 10
|
It feel like the rear wheel is bouncing on and off the ground and stepping out everytime it does so
|
|
June 17th, 2019, 04:39 PM | #12 | |
ninjette.org member
Name: Seamus
Location: Toronto area
Join Date: Jun 2019 Motorcycle(s): 09 ninja 250r, 97 royal enfield bullet 500 Posts: 10
|
Quote:
|
|
|
June 17th, 2019, 06:16 PM | #13 |
ninjette.org guru
Name: john
Location: placerville
Join Date: Apr 2016 Motorcycle(s): ninja 300 Posts: 386
|
|
|
June 17th, 2019, 06:18 PM | #14 | |
Rev Limiter
Name: Jay
Location: WI
Join Date: Jul 2013 Motorcycle(s): '06 SV650n, '00 Derbi GPR, '64 CA77 Dream 305, '70 CL450 Scrambler, numerous dirt bikes Posts: A lot.
MOTM - Jun '18, Oct '16
|
Quote:
In that case, start by looking at the tire, tire balance, and alignment. Next would be the chain/sprocket condition and adjustment. Grab the wheel and see if you can twist it. Try to move the swingarm side to side. 59096, csmith, and danno have pretty much covered most of the possibilities. |
|
|
June 17th, 2019, 06:48 PM | #15 | |
ninjette.org certified postwhore
Name: AKA JacRyann
Location: Mesa, AZ
Join Date: Dec 2011 Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C Posts: A lot.
MOTY - 2018, MOTM - Nov '17
|
Quote:
Check chain-wear and slack. Make sure rear-tyre isn't mounted backwards. Hang rear of bike in air by frame so swingarm is free of any load. Grab rear-wheel and wiggle it around in all directions. Grab swingarm and yank sideways, up & down. |
|
|
June 18th, 2019, 06:34 PM | #16 | |
ninjette.org member
Name: Seamus
Location: Toronto area
Join Date: Jun 2019 Motorcycle(s): 09 ninja 250r, 97 royal enfield bullet 500 Posts: 10
|
Quote:
I’ve checked the tire and rear wheel bearing. Haven’t checked the swing arm bearings by jacking the frame up I will definitely give that a try thank you. |
|
|
June 18th, 2019, 06:38 PM | #17 |
ninjette.org member
Name: Seamus
Location: Toronto area
Join Date: Jun 2019 Motorcycle(s): 09 ninja 250r, 97 royal enfield bullet 500 Posts: 10
|
Is there any chance it’s a body position or I’m just riding it wrong. Like I have a decent amount of riding experience and am usually the fastest through corners on group rides (cbr 600, ninja 400, fz 07, we even have another ninja 250 so some real competition). But I’m wondering if the bike is fine and I’m doing something wrong
|
|
June 18th, 2019, 07:41 PM | #18 |
The Corner Whisperer
Name: Chris (aka Reactor)
Location: Northern KY
Join Date: May 2011 Motorcycle(s): 2010 250 (track), 1992 250, 2006 R6 (street/track), 2008 R6 (track) Posts: Too much.
MOTY 2015, MOTM - Nov '12, Nov '13
|
I was going to ask about the rider in my original post but changed my mind. Since you asked about the rider... yea, being tight on the bars can cause little slides in the rear and a general feeling of an unsettled ride. You would be the first rider that I have run accross to describe it as the bike is trying to "buck" you off. Perhaps it's not quite "bucking", can you be a bit more specific as to what you feel?
Another thing is moving your bum around after the bike has some lean. Basically, get off the seat before you turn. Aka, get off early and stay there until the bike nearly straight up and down on corner exit. If you take the skill to near peak ability, you will always be on the throttle when your bum moves. You make up a considerable portion of the mass/weight of the entire operation, the suspension can't compensate for you moving around on the seat while mid-corner. The bike has a base level of suspension ability, good throttle control keeps the suspension in a compliant range where the bike is stable. Lack of good throttle control can detract from the working range of suspension. You have one job as the rider. "Keep the bike stable." Say it 1000 times so it sinks in real good. Do you do any of these things? Do you trail brake deep into the corners?
__________________________________________________
Goal: Shake A Million Hands | Look through the corners | Track Day Prep | Closest track? | The Mid-Ohio School |
|
June 18th, 2019, 08:01 PM | #19 | |
ninjette.org certified postwhore
Name: AKA JacRyann
Location: Mesa, AZ
Join Date: Dec 2011 Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C Posts: A lot.
MOTY - 2018, MOTM - Nov '17
|
Quote:
Tension? At middle static ride-height, chain is most loose, then it tightens up as suspension compresses or extends from there. When you've got bike suspended, and swingarm fully extended, re-check the chain-tension. How heavy are you? It's very possible you're bottoming shock as JRshooter suggests. Stock shock is very soft and with age, damping levels decrease as well. |
|
1 out of 1 members found this post helpful. |
June 19th, 2019, 06:37 AM | #20 | |
Rev Limiter
Name: Jay
Location: WI
Join Date: Jul 2013 Motorcycle(s): '06 SV650n, '00 Derbi GPR, '64 CA77 Dream 305, '70 CL450 Scrambler, numerous dirt bikes Posts: A lot.
MOTM - Jun '18, Oct '16
|
Quote:
|
|
|
June 19th, 2019, 12:02 PM | #21 |
ninjette.org member
Name: Seamus
Location: Toronto area
Join Date: Jun 2019 Motorcycle(s): 09 ninja 250r, 97 royal enfield bullet 500 Posts: 10
|
Around 160 with gear and after a Big Mac. Not a heavy rider by any means. I’m going to check the swing arm bearings right now so I will let you know how that goes
|
|
June 19th, 2019, 12:24 PM | #22 |
Rev Limiter
Name: Jay
Location: WI
Join Date: Jul 2013 Motorcycle(s): '06 SV650n, '00 Derbi GPR, '64 CA77 Dream 305, '70 CL450 Scrambler, numerous dirt bikes Posts: A lot.
MOTM - Jun '18, Oct '16
|
Replaced sprockets with the chain, or no?
|
|
June 19th, 2019, 12:28 PM | #23 |
ninjette.org member
Name: Seamus
Location: Toronto area
Join Date: Jun 2019 Motorcycle(s): 09 ninja 250r, 97 royal enfield bullet 500 Posts: 10
|
|
|
June 19th, 2019, 12:38 PM | #24 | |
Rev Limiter
Name: Jay
Location: WI
Join Date: Jul 2013 Motorcycle(s): '06 SV650n, '00 Derbi GPR, '64 CA77 Dream 305, '70 CL450 Scrambler, numerous dirt bikes Posts: A lot.
MOTM - Jun '18, Oct '16
|
Quote:
Spin the rear wheel and look for any jumping of the chain, fluctuations in tension, or odd noises. |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
[visordown.com] - Visordown achieves record growth bucking motorcycle industry slump | Ninjette Newsbot | Motorcycling News | 0 | March 6th, 2018 10:01 AM |
Bike idles higher when leaned over on kickstand | cuong-nutz | 2008 - 2012 Ninja 250R Tech Talk | 2 | September 25th, 2014 12:24 PM |
2012 250 bucking at high rpm | NismoAce | 2008 - 2012 Ninja 250R Tech Talk | 10 | July 26th, 2012 08:59 PM |
[sportrider - latest stories] - 2012 Honda CBR1000RR | Bucking The Trend | Ninjette Newsbot | Motorcycling News | 0 | March 13th, 2012 12:00 PM |
Newbie with bucking in 1st | Firehorse | Riding Skills | 39 | December 21st, 2011 11:05 PM |
|
|