front end wobble no hands on bars

EMSRacer07 · March 22nd, 2014, 09:54 AM

Heard it talked about a few times and the other day was going about 30-40 and let go of the bars ( I usually have at least the throttle hand on all the time) and about 5-10 seconds it would wobble where I needed my hands back on. But would be smooth with my hands on.

The frame of my bike and wheels (exempt bearings are new on the wheels) are all factory stock. Heard the head stem bearing is the cause?

Im really not worried since I hardly take my hands off the bars. But would like to know if I can adjust or fix it. Thanks

Motofool · March 22nd, 2014, 10:38 AM

Quote:

Originally Posted by EMSRacer07

..........But would like to know if I can adjust or fix it. Thanks

Assuming that all the articulations (stem and swingarm) are tight, the wheels are balanced and aligned and the chain is well adjusted, the only two things to effectively experiment with are:

- Decrease the front suspension angle (more vertical) via playing with the front and rear heights.

- Increase the weight at the handlebar ends.

EMSRacer07 · March 22nd, 2014, 10:58 AM

Quote:

Originally Posted by Motofool

Assuming that all the articulations (stem and swingarm) are tight, the wheels are balanced and aligned and the chain is well adjusted, the only two things to effectively experiment with are:

- Decrease the front suspension angle (more vertical) via playing with the front and rear heights.

- Increase the weight at the handlebar ends.

the front tire is a bit taller than the stock one. but its balanced and suspension is brand new, just had the forks done.

Also just bought 1lb bar ends. might help

Motofool · March 22nd, 2014, 11:05 AM

Quote:

Originally Posted by EMSRacer07

the front tire is a bit taller than the stock one..........

If your zx600 rear shock makes the rear lower, your head angle and trail have increased, which makes this natural problem (oscillation of steering) more evident.

The weights increase the angular inertia of the oscillating parts and change the natural frequency:

http://en.wikipedia.org/wiki/Natural_frequency

agentbad · March 22nd, 2014, 08:22 PM

It's normal just keep hands on the bars.

Alex · March 22nd, 2014, 08:40 PM

http://www.ninjette.org/forums/showthread.php?t=13288

March 22nd, 2014, 09:54 AM	#1
EMSRacer07 ninjette.org sage Name: Byron Location: Reno, NV Join Date: Dec 2011 Motorcycle(s): Ninja ex250 1990 Posts: 761	front end wobble no hands on bars Heard it talked about a few times and the other day was going about 30-40 and let go of the bars ( I usually have at least the throttle hand on all the time) and about 5-10 seconds it would wobble where I needed my hands back on. But would be smooth with my hands on. The frame of my bike and wheels (exempt bearings are new on the wheels) are all factory stock. Heard the head stem bearing is the cause? Im really not worried since I hardly take my hands off the bars. But would like to know if I can adjust or fix it. Thanks __________________________________________________ 1990 250F. ex300 motor swap, 15/42 gearing, flush side markers, newgen intergrated front fairing, rear integrated turn signals, DB Touring Bubble, zx600 rear shock, Custom DanMoto Exhaust

March 22nd, 2014, 08:40 PM	#6
Alex ninjette.org dude Name: 1 guess :-) Location: SF Bay Area Join Date: Jun 2008 Motorcycle(s): '13 Ninja 300 (white, the fastest color!), '13 R1200RT, '14 CRF250L, '12 TT-R125LE Posts: Too much. Blog Entries: 7	http://www.ninjette.org/forums/showthread.php?t=13288 __________________________________________________ Montgomery Street Motorcycle Club / cal24.com / crf250l.org / ninjette.org ninjette.org Terms of Service Shopping for motorcycle parts or equipment? Come here first. The friendliest Ninja 250R/300/400 forum on the internet! (especially Unregistered)

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March 22nd, 2014, 08:22 PM	#5
agentbad ninjette.org sage Name: bob Location: Earf Join Date: Apr 2013 Motorcycle(s): 2005 Ninja 250, 2006 SV650N Posts: 642	It's normal just keep hands on the bars.