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Author Topic: 1983 cb900 USD conversion  (Read 469 times)

Offline CrabsAndCylinders

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Re: 1983 cb900 USD conversion
« Reply #10 on: Nov 06, 2017, 16:33:32 »
I know people have pressed the 900 stem into F2 clamps and it works well.  Some people have even bored the 900 clamps out to accept F2 forks but I am not sure if the size of the FZR tubes would allow this.
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Offline Sav0r

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Re: 1983 cb900 USD conversion
« Reply #11 on: Nov 07, 2017, 11:44:30 »
Can't you shorten the FZR stem and use an All-Ball conversion to fit the frame? That's exactly what I did with my RD, though I used older non-USD FZR 600 forks. I used the stock RD hub and made spacers for the hub and brake rotor.
Sav0r the adventure.

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Offline focusinprogress

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Re: 1983 cb900 USD conversion
« Reply #12 on: Nov 08, 2017, 10:19:16 »
The FZR 1000 LE3 uses a 17mm axle! I can simply swap the bearings in my cb550 hub to fit the 17mm axle ... correct bearing-size should be something like 42x17x12.

Do you have more information about the bearings for the steering stem? To be honest, I thought I have to press out the stem of my cb900 and press it in the FZR bridge.....

if it's 17mm you're in luck....stock bearing is 42x15x13

https://www.123bearing.com/bearing-DG1742-RS-C3-KOYO.php

for neck bearings:

http://www.allballsracing.com/index.php/forkconversion

if you punch in cb900f and scroll all the way down to FZR1000 you'll see you need a 25x47x15 top bearing and a 30x55x17 bottom bearing, allballs part numbers 99-3518-5 and 99-3519-5 respectively.

if the FZR stem isn't more than a quarter inch between bearing seats, the all balls kits come with big fat washers to put under the bottom bearing or under the top race in the neck (or both) to take up about 1/4".
« Last Edit: Nov 08, 2017, 10:21:27 by focusinprogress »
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Offline innovativems

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Re: 1983 cb900 USD conversion
« Reply #13 on: Nov 09, 2017, 12:51:04 »
The big thing is trying to get the trail to 95mm so that it handles properly.  I'm doing a f3 front end with cb900f triple bored for the f3 forks.

Offline CrabsAndCylinders

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Re: 1983 cb900 USD conversion
« Reply #14 on: Nov 09, 2017, 15:20:47 »
The thing I wonder about is the reduced ground clearance, I have F2 forks and wheels to put on mine and I have read of how much lighter the bike is and feels but it does lower the bike.
Lighter, Quicker, Faster.
ZX-14, 900F x 2, 1100F, R100, CBR600, SR500, GT500, RZ350, KZ1000 x 2, Moto Guzzi Lemans lll, CBX550, RD 350, 750 SOHC police special, RG250, TL1000R, GT750, KTM Super Duke 1290 R, Harris/Z-1, Norton 750 Commando, Green 77 KZ650