Front Suspension. - Wrist Twisters
 
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post #1 of 16 Old 12-18-2008, 01:31 AM Thread Starter
 
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Smile Front Suspension.

I know this has probably been asked several times before.

Has anyone here changed their front suspension from the standard Honda set up on the 900 hornet to 'upside down' fork setups?

If so can you tell me of any problems that happened or might have to be overcome as I'm thinking about it?
Thanks.

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post #2 of 16 Old 12-18-2008, 06:41 AM
 
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Welcome to the site, Friend.

Take a look here:

https://www.wristtwisters.com/forum/s...ad.php?t=14190

Three of the entries have USD forks.

My question would be: why?

Is it worth the expense? Why not a Race Tech kit (springs, compression and rebound valving)?

Just my
Mike

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post #3 of 16 Old 12-19-2008, 01:26 AM Thread Starter
 
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Thanks Mike - I'll have a look into it.

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post #4 of 16 Old 12-19-2008, 09:30 AM
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A good alternative is Lindemann Engineering. See this thread for more details:
https://www.wristtwisters.com/forum/s...ight=lindemann
They have been involved with racing for many years and take a minimalist approach to front suspension, keeping internals as stock as possible, which keeps costs down. Always a good idea! That, combined with the raves I've read here and elsewhere would seem to indicate they are the way to go.

Rob

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post #5 of 16 Old 12-19-2008, 07:07 PM
 
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Phil had LE revalve the forks on the Tuono before selling it. I had it dialed in at Streets of Willow by Randy Acevedo of Inhouse Suspension. He headed the race program for Race Tech for six years; the guy is good.

He liked the way the forks were valved. Took him about 20 minutes to dial it in. The bike handled like a dream on the track; haven't rode it on the street yet (it's still on the back of the track from two weeks ago :001_smile.

So LE is a great option, if you were in Deleware instead of the UK.

Not sure if the shipping time and cost would be worth it.
Race Tech is marketed as a do-it-yourself kit with tech support.
Just find a good local motorcycle shop to do the work if you're not capable.



^ I'm trying to get rid of some pennies.

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post #6 of 16 Old 12-19-2008, 07:55 PM
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I'm pretty sure there are authorized RaceTech suspension centers in the UK.

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post #7 of 16 Old 12-19-2008, 08:27 PM
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I raceteched my 9'r and I've also been riding an '07 CBR600RR and I like the feel of the 9'r better than the CBR.

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post #8 of 16 Old 12-20-2008, 11:50 AM
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Quote:
Originally Posted by hasbeenracer View Post
I'm pretty sure there are authorized RaceTech suspension centers in the UK.
maxtonmight be easier to locate over there

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post #9 of 16 Old 12-20-2008, 02:27 PM
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Quote:
Originally Posted by Sokali View Post
My question would be: why?

Just my
Mike

For me it was a styling exercise. . .finishing what Honda should've done with the 919. When I first saw the 919 in 2002, I felt its modern naked muscular look needed the USD forks. The extra benefit of course is the adjustablity that the RC51 forks offers. The standard 919 forks, especially '04 on, are fine. . . especially when they're kitted.

The RC51 forks are the optimum length, matching closest to the 919's fork length. Though some have used the shorter 929/954 forks without problems, I wanted to make sure I didn't change the 919's handling traits too much if at all.

Here's a start for you, my how-to write up:
https://www.wristtwisters.com/forum/s...?t=9107&page=2

And, here's a current project that mdtoney has embarked on:
https://www.wristtwisters.com/forum/s...ad.php?t=16518

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post #10 of 16 Old 12-20-2008, 03:04 PM
 
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Not trying to turn this into another argument, but we're looking at around $3k for a set of RC51 forks and Ohlins shock to properly suspend a 100 hp bike with a weak frame. IMO you should strip the bike down to the frame and have a frame shop add some braces to it. Otherwise you're wasting your money. Just my opinion.

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post #11 of 16 Old 12-20-2008, 03:45 PM
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Quote:
Originally Posted by Sokali View Post
Not trying to turn this into another argument, but we're looking at around $3k for a set of RC51 forks and Ohlins shock to properly suspend a 100 hp bike with a weak frame. IMO you should strip the bike down to the frame and have a frame shop add some braces to it. Otherwise you're wasting your money. Just my opinion.
No argument here.

One word. . .Ebay. Otherwise, I wouldn't have done the conversion.
The stock '04-on rear shock with the stock RC51 forks works fine. . .at least for me. I had an Ohlins new in the box. . .I sold it.

I had a tricked out '04 600RR with a bunch of money thrown at it (kitted SHOWA suspension/Ohlins, Marchesinis, full Ti Arata exhaust, etc.) and then later a very well sorted Ducati 748. . .I enjoy the 919 more overall, even with its "weak" frame and all. It's not a race bike. A styling exercise that's a GREAT everyday driver. My Ebay money was well spent.

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post #12 of 16 Old 12-20-2008, 04:09 PM
 
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Sure, if you can get a nice deal on ebay, then I'm all for it.

But from what I've been told by several suspension specialists, the shock is under-sprung for a sportbike. At least for the track; and I'm only 175 pounds, suited and booted.

I've put .9 kilogram RaceTech springs and compression kit up front. May do the rebound later (didn't know about the rebound kit back when we did the forks). And raised the forks 10mm to compensate for the soft shock. BTW the shock is at the stiffest setting. Suspension people look at the preload as low speed damping and the compression damping as high speed.

So if I had to do it again, I'd look for an Ohlins on ebay first.

Or leave it stock and get a $2k-$3k track bike.
It's good enough stock for street riding.

If you're after looks, then no one can argue about upgrading to USD forks.

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post #13 of 16 Old 12-21-2008, 12:49 AM
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Quote:
Originally Posted by Sokali View Post
Sure, if you can get a nice deal on ebay, then I'm all for it.

But from what I've been told by several suspension specialists, the shock is under-sprung for a sportbike. At least for the track; and I'm only 175 pounds, suited and booted.

I've put .9 kilogram RaceTech springs and compression kit up front. May do the rebound later (didn't know about the rebound kit back when we did the forks). And raised the forks 10mm to compensate for the soft shock. BTW the shock is at the stiffest setting. Suspension people look at the preload as low speed damping and the compression damping as high speed.

So if I had to do it again, I'd look for an Ohlins on ebay first.

Or leave it stock and get a $2k-$3k track bike.
It's good enough stock for street riding.

If you're after looks, then no one can argue about upgrading to USD forks.

Sokali,
Again, read post #9. Whew.

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post #14 of 16 Old 12-21-2008, 08:11 AM
 
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:001_smile: OK. I guess we're saying the same thing. If Honda had put USD forks and adjustable shock on the 919, I would've gladly paid a couple of grand extra for the bike.

And if I can find a set of RC-51 forks for $1k, I'd probably do the conversion.
I'm just looking at the cost here, that's all.

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post #15 of 16 Old 12-24-2008, 11:50 AM Thread Starter
 
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Well I don't have huge amounts of cash at my disposal either but the USD do LOOK the part definately. Ohlins usually require selling a kidney.
When I got the bike initially I paid out £350 on a Hagon rear shock to drop the seat height (I'm not 6 foot!). It does make me ponder that I could have to change this if I was to redo the front end.
It's a big job really and needs a lot of research and thought before opening ones wallet, That's the easy bit isn't it?

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post #16 of 16 Old 12-24-2008, 06:11 PM
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Quote:
Originally Posted by ratdog View Post
maxtonmight be easier to locate over there
What ratdog said.

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