thanks Shayne for the help, looking for MC now. I am going to shim the cbr900 rr forks so I can get in a ride day add more pre-laod. I also plan on raising rear 4 or 5 mm see if this helps turn in. Looking now for Calipers on EB, see what I can get, then send the forks off for rework mid Sept.

I would like to raise the forks a little more, their 12mm above the triple now, some say this is not a good idea, why ? there needs to be more weight on the front tire. How much higher can I get away with ?
Can anyone tell me the length overall of the stock VTR forks, unloaded and fully extended ? I would like to know how much shorter the 900rr forks are vs stock, then I have a place to start from

 

Well, the reason for not dropping the forks to much is that you start grinding stuff in the bends... And for some reason the tires have more grip when they are not suspended by the headers/sidestand in the air...

Getting the rear up loads up the front and does the same to the geometry as dropping the front... But it doesn't cut ground clearance... Keep the front as is and do 5-10 mm in the rear instead...

 

Haha, the tires suspended by hard parts is a big deal .
I moved the rearsets almost all the way up, there is no sidestand, but I forgot about the headers. I will start with 5mm in the back, stiffer front.
thanks for the input

Stock VTR fork length anyone ?

 

Well, I did too once a long time ago... I ended up in the graveltrap on the local track...

I was a bit bruised but otherwise fine and the bike wasn't that hurt but I had a hole the size of my thumb on the header... Ran like crap and made an unbelievable noise... That kind of ended my fun day rigth there...

 

Hey Rock,
You might find what you're looking for in this thread.
https://www.superhawkforum.com/forum...k+measurements

 

Thanks for the link
I remember seeing that thread but had no idea how to find it. I may have read it wrong, but it seems I need to have stock plastics to get the same
measurement, I just need the unloaded fork length from center of axle to top of fork, in stock VTR set-up. Am I not reading correctly ?
My unloaded CBR900rr forks measure 28-5/8 incches center axle to top.
or 71.12 cm. There may be + or- 1/4 inch as I did not lift it airborne, but definately unloaded.

 

Okay, we pulled my forks apart on Sunday, and to my surprise there filled with Racetech valves and springs, a big plus of course. seems the problem was the spacer wasnt big enough to allow pre-load adjustment to work,
there was a 3/4 inch gap. A new spacer was put in and I added 5mm to the rear, set the sag @ (30mm front 20mm rear) for now. I also raised the forks to 15mm above upper triple.They were at 10mm before. With the forks bottomed out, fork caps open, I had 4 inches of ground clearance to the belly pan,(almost)... I am pretty certain it wont hit the ground , but I will use some caution first time out. Still Ebaying for calipers and MC, at least one guy doesnt need a new set any longer.

 

Make sure you don't get into any tank slappers.

 

I know, but the thing turns like a tractor, I havn't been able to determine stock height, and my good friend, suspension know it all, insists I will be fine. So my first few turns I will be trying to induce front end feed back, controlled, wish me luck. As it was, I could come down from a power wheelie, almost full lock,(slight exageration) at xx mph and it would just settle in and say thanks. She definately needed less chopper like attitude, I would have preferred a few baby steps , but mr. suspension know it all says it will be cool, so here we go uhh anyone know, all throttle, or all brake, or all prayer to pull out of a nasty one ?

 

Nerves, muscle and lots of prayer... Don't touch the gas or brake...

 

tank slapper... in theory you will reduce the effect if you unload the front tire. get ON the gas. of course it can be difficult if the bar is ripped out of your hand.

another solution is to lighten up on the bars when lofting the front tire, the gyro effect will help keep the wheel inline when your bringing it back down. i have a damper to help with my lack of skill, lol.

tim

 

Rock, have you made sure you have proper tire pressure in both tires? My SH turns like no ones business, and it has the stock suspension setup and 35/42 tire pressure.

 

Best tank slapper is no tank slapper, I am ready as I can be.


I do adjust tire psi, I found 30 front/33 rear to work best, but things have changed alot since then. I think my poor turn in is a combination of Cbr 900 forks, Ohlins rear shock and ride height not in snyc with each other. As much crap as I like to give my friend, he is pretty good,or lucky, with initial set up. If I decide to take the bike to the track (Monday) I will find out. The problem is the bridge to San Francisco (bay) is closed for 4 days for adjustments. the return home traffic is going to be remembered for ever, I suspect all new records for road rage, and delays...