Honda CBR 600RR Forum banner

1 - 20 of 28 Posts

·
Registered
Joined
·
93 Posts
Discussion Starter #1
Went up and down the drive today to check the bike was running ok after a small front end bump. First impressions were that the steering felt quite light and twitchy.

I don't know whether that's because I haven't ridden in over a month or if it's the bike or just placebo but it didn't feel as sure as I remember.

Any reasons this might be happening? The front end isn't completely put back together yet (no mudguard, upper cowl or headlights) but I'm not sure if that'd be why.

Other thing is that the clocks aren't plugged in, would that mean the steering damper wouldn't be engaged??
 

·
Registered
Joined
·
1,862 Posts
I believe a steering damper is an aftermarket part on all cbr's. And i believe it is also completely mechanical.


Edit: as for the other questions, im not sure, sorry.
 

·
Registered
Joined
·
93 Posts
Discussion Starter #3
Nope, it's OEM and is electronic: "Hidden below the steering head was an updated version of the Honda Electronic Steering Damper (HESD) system, which was also available on the CBR1000RR."

That's why I'm wondering whether everything (particularly clocks) need to be hooked up for it to work. I'm hoping so else I might have a problem somewhere!
 

·
Premium Member
Joined
·
13,137 Posts
I believe a steering damper is an aftermarket part on all cbr's. And i believe it is also completely mechanical.


Edit: as for the other questions, im not sure, sorry.
Dampener is only an after market part on 03-06, all others have one stock, it sits under the tank cover... and its also electronically controlled.

And no, the gauges don't set dampener... the ecu set the dampeners 'stiffness'

EDIT: I had it wrong there for a minute...
 

·
Registered
Joined
·
93 Posts
Discussion Starter #5
Score!! Nico you're a top bloke, think you've answered on all of my posts!! Hopefully will be fine when everything is put back together then.

Can't imagine what the handling would be like without a dampener!!
 

·
Premium Member
Joined
·
13,137 Posts
You can put it into 'test' mode by putting the side stand down, putting the bike into any gear other than neutral, open the throttle all the way and turn the key on. The dampener should then be set to max for 10 seconds.
 

·
Registered
Joined
·
1,862 Posts
I stand corrected and i learned something today. Good day.
 

·
Registered
Joined
·
93 Posts
Discussion Starter #8
Hey Nico (or anyone with an answer!) I tried the test mode you mentioned and can only barely tell the difference. Everything is back together now and the bike still feels really twitchy. I'm not convinced the damper is doing it's job.

When the damper is on max should the effect be very noticeable or does it give minimal resistance?
 

·
Registered
Joined
·
93 Posts
Discussion Starter #9
Just to add as well, the HESD light isn't on which I would have thought would happen if it wasn't working!?

It does flash when I put it in test mode for 10 secs though which I guess is to tell me it's in test mode rather than to tell me there's a problem.
 

·
Registered
Joined
·
3,308 Posts
Front tire pressure, wear?
 

·
Registered
Joined
·
5,280 Posts
function of HESD is speed related.... at low speeds does not need/have much dampening.

also a 10+ lb wt off the front of the bike would change feel somewhat.....

probably only a slight diff. but noticeable?
 

·
Registered
Joined
·
93 Posts
Discussion Starter #13
Sorry forgot to mention it's completely back together again now, it just doesn't handle how I remember it did. I'm wondering whether its in my head but using test mode I can feel very little difference when the damper is on max.

I'll double check tyre pressures again tomorrow but I'm sure they're fine as the were recently
 

·
Registered
Joined
·
182 Posts
If you took the entire front end apart your forks might be at a different height. Are your forks set to the same height as they were before? Different fork height will affect handling. The farther the forks stick out the top of the top clamp, the more twitchy the steering will be. Though just riding around you shouldn't have noticed a change that much if this is the case.

Also, as someone else mentioned check tire pressure. How are your tires? When I bought my bike it came with some wore out piece of crap rubber and the steering was very strange until I got new tires.
 

·
Registered
Joined
·
93 Posts
Discussion Starter #15
Thanks for the suggestions.

I didn't take the forks out, only took it down as far as removing the intake. Forks stayed put. Tyre pressures are 36f 42r which is what I used to run. Hardly any wear on them either.

Went to a dealership today and tried the diagnostic on one of their bikes. Whilst I could tell the difference it wasn't significant and made me think it's probably the same on my bike. Also the fast steering is at very low speeds where I think the damper would be at a minimum anyway.

I'll check fork height hasn't shifted and that preload / dampers are all at stock settings and haven't been knocked. Other than that I'll have to get it looked at, I can pick up a second hand damper pretty cheap anyway so could just eliminate that first.

Any other thoughts would be welcome
 

·
Registered
Joined
·
93 Posts
Discussion Starter #16
fork height fine, preload and damper settings are stock. Just measured wheelbase and got 1382mm which seems to be 13mm longer than stock, but that wouldn't make the bike turn in too fast, quite the opposite. I reckon it's got to be the damper so I've sourced a working one.
 

·
Registered
Joined
·
93 Posts
Discussion Starter #17
Tested the damper today by hand, it definitely works so have ruled that out now as well. Struggling to think what else might cause it.

If the tracking is out would it be turning too quickly? What about wheel balancing? I think it's more that the bike turns in too quickly rather than steering fast.
 

·
Premium Member
Joined
·
13,137 Posts
If turn in has sped up you may find that you have bent the forks in, shortening the wheelbase, but that will be expensive to fix so you probably want to get (at least) a second opinion on that.... and probably one from a suspension specialist.
 

·
Registered
Joined
·
93 Posts
Discussion Starter #19
It's booked in to a race specialist near me. I measured the wheelbase myself and is was 13mm longer than stock (1382mm vs 1359mm stock) which I put down to human error since longer is the wrong way for faster turn in.

Really starting to think it's in my head but am definitely going to get a second opinion.
 

·
Premium Member
Joined
·
13,137 Posts
It's booked in to a race specialist near me. I measured the wheelbase myself and is was 13mm longer than stock (1382mm vs 1359mm stock) which I put down to human error since longer is the wrong way for faster turn in.

Really starting to think it's in my head but am definitely going to get a second opinion.
measuring the wheelbase wont tell you much, you could quite easily get 13mm of error between inaccuracies in your tape measure, where you took your measurement from, differences in suspension setup and simple wear and tear... even something as simple as the fuel and oil will make a difference, especially if honda measured it dry.
 
1 - 20 of 28 Posts
Top