Fork question, what are these? - Honda Motorcycles - FireBlades.org
Honda FireBlade Discussion of the Honda CBR 900RR, Honda CBR 929RR, Honda CBR 954RR, and Honda CBR 1000RR Motorcycles.

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post #1 of 23 Old 09-05-2013, 11:37 PM Thread Starter
 
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Fork question, what are these?

Hey guys, so I came across a 954 rolling chassis and noticed a few differences between it and my own 954. The one thing that really stood out to me was the top of the fork tubes being slightly different. Here's a picture to compare the two and hopefully someone can give me some insight as to what I'm looking at here.

Mine:Click image for larger version

Name:	My 954 Forks.jpg
Views:	39
Size:	456.7 KB
ID:	57089

The forks in question:Click image for larger version

Name:	954 forks.jpg
Views:	38
Size:	436.3 KB
ID:	57088

Thanks for any input
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post #2 of 23 Old 09-06-2013, 1:16 AM
 
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Re: Fork question, what are these?

Those look like older Showa forks. The reason they look different is because when you adjust your preload on the second set it causes the other adjuster to actually lift (basically).

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post #3 of 23 Old 09-06-2013, 2:32 AM
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Re: Fork question, what are these?

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Originally Posted by nicks00si View Post
Hey guys, so I came across a 954 rolling chassis and noticed a few differences between it and my own 954. The one thing that really stood out to me was the top of the fork tubes being slightly different. Here's a picture to compare the two and hopefully someone can give me some insight as to what I'm looking at here.

Mine:Attachment 57089

The forks in question:Attachment 57088

Thanks for any input

Is the second bike a 929?

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post #4 of 23 Old 09-06-2013, 5:45 PM
 
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Re: Fork question, what are these?

Missing steering damper? (Someone had to say it)

If the bike isn't braking properly, you don't start by rebuilding the engine.
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post #5 of 23 Old 09-06-2013, 5:57 PM
 
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Re: Fork question, what are these?

first one is an 04 cbr1000RR forks not a 954, totally different forks



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post #6 of 23 Old 09-06-2013, 5:58 PM
 
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Re: Fork question, what are these?

Sorry my mistake, they just have the adjusters fitted which are the same as the cbr1000 ones



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post #7 of 23 Old 09-06-2013, 5:58 PM
 
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Re: Fork question, what are these?

That looks just like the difference between the earlier SP1 (bottom pic) and the later SP2 (top pic) versions of the RC51
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post #8 of 23 Old 09-06-2013, 8:48 PM
 
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Re: Fork question, what are these?

No wonder they need a steering damper with so little fork off-set.
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post #9 of 23 Old 09-06-2013, 9:14 PM
 
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Re: Fork question, what are these?

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No wonder they need a steering damper with so little fork off-set.
What do you mean? Rake angle?
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post #10 of 23 Old 09-07-2013, 2:23 AM
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Re: Fork question, what are these?

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What do you mean? Rake angle?

Fork offset is the measurement from the steering stem centreline to a line drawn through the fork tube centrelines.
And it has nothing to do with whether a bike "needs" a damper.

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post #11 of 23 Old 09-07-2013, 3:39 AM
 
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Re: Fork question, what are these?

The further forward the forks are from the steering head (fork off-set) increases the castor effect which is, in effect, the ability of the front wheel to self center after a bump. Small off-set does give agile steering, but at the loss of the steadying influence of castor. In other words, small off-set makes the steering more liable to tank-slap.... as, it would appear, the 954's are
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post #12 of 23 Old 09-07-2013, 3:44 AM
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Re: Fork question, what are these?

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Originally Posted by jdugen View Post
The further forward the forks are from the steering head (fork off-set) increases the castor effect which is, in effect, the ability of the front wheel to self center after a bump. Small off-set does give agile steering, but at the loss of the steadying influence of castor. In other words, small off-set makes the steering more liable to tank-slap.... as, it would appear, the 954's are

The wheel self-centres due to its own gyroscopic effect.
954's only have that reputation through rumour rather than empirical data.

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post #13 of 23 Old 09-07-2013, 2:58 PM
 
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Re: Fork question, what are these?

Quote:
Originally Posted by jdugen View Post
The further forward the forks are from the steering head (fork off-set) increases the castor effect which is, in effect, the ability of the front wheel to self center after a bump. Small off-set does give agile steering, but at the loss of the steadying influence of castor. In other words, small off-set makes the steering more liable to tank-slap.... as, it would appear, the 954's are
Thanks, that's just what I thought you meant. I can relate to the effects of offset, I've experienced the difference a little offset one way or another can make with various mountain bikes. It's pretty easy to feel the effect offset has when you're pedaling a bike. Just take your hands off the handlebars and see how easy or difficult it is to keep pedaling in a straight line.

But I also can understand how a faster spinning wheel on a motorcycle and the gyro effect would have an effect.
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post #14 of 23 Old 09-07-2013, 3:15 PM
 
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Re: Fork question, what are these?

Again, the top left is definitely stock Showa 954 forks, and certainly mounted to a 954. The second set looks like the generation of Showa before they made the adjusters non-rising. Always subject to be wrong, but the top left pic I know for a fact I am 100% correct on- I compared it to my own bike lol.

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post #15 of 23 Old 09-07-2013, 7:25 PM Thread Starter
 
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Re: Fork question, what are these?

The top left are like any other 954 forks that I've seen, they are on my bike right now. The bottom set are the ones in question. I'm just not sure what they are. There are slight differences in the caps.

As far as the theory regarding 954s needing a stabilizer, I would have to agree. I don't know about empirical data, but I can tell you from my own personal experience that they will occasionally tank slap without one. I have had one on my bike since I bought it as you can see in the picture. One day, the damper came loose from the stem. I was accelerating and hit a bump. It began to slap violently back and forth. Luckily I was on the throttle and it pulled out of it fairly quickly, but after that I made sure to replace and tighten all the set screws. Just my two cents.
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