50gary
Under the Limelight
Yes, to adapt the GSXR forks to the KZ 400 head tube.
1. Press out the GSXR stem
2. Have a machine shop measure the specifications of the KZ stem write them down.
3. Have the machine shop duplicate the KZ stem from the aluminum GSXR doner stem.
4. Have the "new" GSXR stem pressed back into the GSXR lower triple.
I did just this operation last week for a DT 250 Cafe conversion using conventional 45mm 01-03 GSXR-600 forks. I then used new tapered roller bearings in the DT steering head tube. The reason this works quite easily is because both bikes use a 30mm lower I.D. bearing the upper of the DT is smaller I.D. so you can turn down the upper part of the larger diameter GSXR stem. Works well and I trust it more than welding the aluminum GSXR stem and getting it strong and true. The GSXR stem is robust and the finished wall thickness is more than strong enough IMO. Going from a very high HP heavier sport bike to a light weight 250 cafe bike I feel comfortable with the work. Next is to adapt a narrow 18" wheel to the wider forks using a single rotor, and the larger diameter GSXR axle. Just two cents of suggestive advise.
Cheers, 50gary
1. Press out the GSXR stem
2. Have a machine shop measure the specifications of the KZ stem write them down.
3. Have the machine shop duplicate the KZ stem from the aluminum GSXR doner stem.
4. Have the "new" GSXR stem pressed back into the GSXR lower triple.
I did just this operation last week for a DT 250 Cafe conversion using conventional 45mm 01-03 GSXR-600 forks. I then used new tapered roller bearings in the DT steering head tube. The reason this works quite easily is because both bikes use a 30mm lower I.D. bearing the upper of the DT is smaller I.D. so you can turn down the upper part of the larger diameter GSXR stem. Works well and I trust it more than welding the aluminum GSXR stem and getting it strong and true. The GSXR stem is robust and the finished wall thickness is more than strong enough IMO. Going from a very high HP heavier sport bike to a light weight 250 cafe bike I feel comfortable with the work. Next is to adapt a narrow 18" wheel to the wider forks using a single rotor, and the larger diameter GSXR axle. Just two cents of suggestive advise.
Cheers, 50gary