93-97 CBR900RR but only 93-95 used a mechanical speedometer drive. It's the front end that guy Tim Shutters used on his bike.
I downloaded this document somewhere a little while back:
Instructions for front end conversion of a CB 750 to a 900RR
1. Locate from a salvage yard a stock 1993-94 CBR 900 RR front end. Try to obtain a complete front end with clipons, wheel, and all brake componetry. This will make this project much easier if you don’t have to hunt down parts.
2. With a die grinder, remove the weld around the steering stem bolt located underneath the bottom of the 750 and 900 triple trees. Make sure you have ground off the entire weld.
3. With a machine press, press out the steering stem bolts from both the bottom triple trees. Once the stems are removed from both triple trees, insert the stem from the 750 into the 900 triple tree, this will require the use of the machine press as well. Be very careful performing this step, protect the threads of the steering stem as they can be easily damaged. I used a soft piece of wood and a rag wrapped around the stem.
4. Have the bottom of the 900 triple tree with the 750 stem welded together just as it looked before.
5. I’m not 100% sure, but I believe that the top triple clamp will require having a tab or two removed with a die grinder as well, Its been over a year since I performed this on my bike, I cant quite remember.
6. With a die grinder, remove the tab at the front of the frame that was used as the bike lock.
7. Install the front end. At this point you will notice that the front end has very little steering travel. You must next grind down the steering stops on the frame until you have a better turning radius. It is very important that you install the gas tank while performing this operation, so you don’t remove so much of the steering stops that the fork tubes hit the tank.
8. This now allows you to permanently install the entire front end into your 750 frame. You could reuse you stock bearings, but I would highly recommend that you install a set of new tapered bearings (for a CB750) in your front end. They can be tricky to install also, but you wont need a shop press to do this, just a rubber mallet, and a piece of pipe or tubing that will allow you to tap the bearings into place.
9. I believe that is it. There are some obvious things that I left out like making sure that you pay attention to the order in which you removed the washers and bolts from your 750 as they will need to be reinstalled in the same order, check your service manual for torque specs, etc. I really didn’t have much trouble performing this conversion, and have been really happy with the performance gains as a result. The brakes are 100 times better, the steering is a little quicker, and it looks really cool!
Here's some pics of his bike:
http://vjmc.org/members/shutterst.htm
